My Recent Project

Right now, you may be saying to yourself, "What the heck is that?" A valid question. You are probably noticing the delicate plywood veneer, authentic refuse windows, gratuitous internal frame or upon closer inspection; handles on widows and hinged side door-then it becomes clear. It's a cold frame...sort of.

I picked up these two old windows in Burlington, VT my senior year of college and they've been stored at my parent's house ever since. About 2 years if you're curious. Luckily, my family has packrat tendencies and the windows didn't get trashed. It was always my intent to use them in an enclosure for my plants that may need more moisture and higher temperatures than available in ambient house conditions. Since I had a surplus of free time and my Dad had extra wood in the basement, I finally completed this little project. The windows needed a little planing on the edges and some glue for some cracking, but everything is relatively snug. I caulked seems on the bottom and outside to make the contraption a little more airtight. I plan to paint the inside white to maximize light availability. The more air-tight the box, the more moisture. To allow airflow I may install an old computer fan. It's not really transportable, so perhaps I'll add a wheel, wheel-barrow fashion.

Winter months in the Northeast tend to be a little harsh on some of my sensitive plants like, well, my sensitive plant (which actually died in the care of my parents while I was interning in Florida). A couple of my favorite plants (Guiacum sanctum, an apparently weeping Lysiloma latisiliquum phenotype and Acacia faresiana) that I acquired in Florida, will greatly appreciate their new home, especially the heat.

The design of this "moisture box" is probably suitable for withstanding the elements of spring, summer and fall. It is my hope that my parents will use it as a cold frame,if/when I no longer require it. My mother is already thinking of things she could use it for, but she can be whimsical, so maybe my dad will use it. So I guess it could be used as a cold frame, but it's initial contrived function was to keep certain plants happy.

I guess this was all just one big excuse to make something with junk windows...mission complete. A much easier solution would be to buy metal wire shelves, a plastic encasement and lights, but that's no fun.

This post was sort of lacking in fun botany stuff, but the project was fun to complete. Next week I think I'll discuss some crazy plants chemical/s. My inspiration for this topic comes from earlier this week when after I had my wisdom teeth removed and was coming out of an anaesthetic stupor. Apparently I was asking the oral surgeon about curare...

Some of "my" plants

Over the past few days I've been going through the plants I've collected over the past couple of years. When I say collected, I mean digging up a plant, with some roots in tact and placing it in my plant press. A plant press is essentially a multi-layered cardboard and newspaper sandwich with two pieces of wood as the "bread". The dimensions of the contraption are 11.5 inches x 17.5 inches; the same as a sheet of herbarium paper. The pressing is achieved by straps. I've used cinder blocks, but found they decrease portability.

After the plants have been placed in the press (in newspaper, cardboard and wood, in that order) they are allowed to dry, which preserves leaf and flowers color in the process. Sometimes. I have a fair share of plants that dried black or have discolored in the process. In fact, sometimes drying quality can be an identification character in some dichotomous keys. One common plant that dries black is Monotropa uniflora, or Idianpipe. Recently I learned that these plants are not simply parasitic on the roots of forest trees. Instead, they obtain nutrients from mycorrhizae, an association of fungal hyphae and plant roots, that earn them their name as a mycotroph. Observing the extremely fine roots of Monotropa it is easy to imagine them penetrating delicate mycorrhizae.

I've only collected about 230 specimens so far, which isn't that much considering some folks collect thousands in their lifetime, for example botanist Awlyn Gentry collected around 80,000 plants in his lifetime (which was cut short). Of those plants that I've identified and mounted on herbarium paper two stand out, mostly because of their cool flowers: Mitella diphylla and Lithophragma parviflora. Both are small herbaceous plants in the Saxifragaceae family. A good description and distribution of the family can be found on this website. Scroll down to read about some of the pollination and seeds dispersal mechanisms! So cool! Check out the "Main Tree" too. Look for Saxifragales. Apparently it is basal to the rosids, which surprises me because they share so many characters. Specifically, they share leaves with stipules, 4-5 sepals and petals, a hypanthium and stamens 1x-2x petal number. Those are a limited number of characters, but would normally lead you to the rosids clade. I guess not in this case. There are many other morphological factors to consider, not to mention chemical and genetic identifiers.

Mitella diphylla has very small, but beautiful feather-like petals with 10 stamens hiding inside the hypathium. Lithophragma parviflora's petals have three lobes that give the illusion of more petals than actually exist with palmately lobed leaves to match. Click on the links to see what they look like.

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Lianas?

About a year ago I took a trip to Costa Rica as part of a three-week plant systematics field trip with the University of Vermont. Lianas were present in nearly every forest type we explored. The word “liana” seemed exotic and their commonness was perhaps the most noticeable differences between northern temperate and tropical forests. Even the subtropical forests of southern Florida I became familiar with didn’t share such a pronounced abundance of these elegant climbing plants. I asked myself this question: Do northern temperate forest have lianas? The short answer is yes, but what follows here is the strange rabbit hole my mind traveled down in attempt to learn more. ( The picture on the left is a liana behind my uncle's house, the right is Bauhinia spp. in Costa Rica)

Google searches to a peer reviewed ecology papers will define lianas as a climbing woody vine. We definitely have these up north. As a kid I can remember swinging on big vines behind my uncle’s house, a place I visited recently. Although not as abundant, lianas exist in northern temperate forests. We know them as vines, which doesn’t sound as sexy.

In fact, there are about 215 liana species in the contiguous United States according to the USDA-NRCS (Londre and Schnitzer, 2006). The lianas behind my uncle’s house were likely of the genus Vitus, grapes, but other species I’ve regularly seen are Parthenocissus quinquefolia, Celastrus orbiculatus and Toxicodendron radicans (Virginia creeper, Oriental bittersweet and poison ivy). Liana studies done in northern forests almost always mention these species.

Apparently, one main reason why lianas don’t exist is such abundance in temperate forests is due to freezing xylems. However, a 0.94°C increase of average temperatures over the last 45 years in Wisconsin hasn’t increased liana abundance there (Londre and Schnitzer, 2006). However, in South Carolina, where increases in average temperatures could decrease the number of day below freezing per year, Allen at al’s 2007 study showed no convincing results that indicated increasing liana growth rates over a 12-year span.

According to Londre and Schnitzer (2006), we can expect to see more lianas along forest edges rather than interiors, which is what one might expect if they were in a tropical environment. Laurance et al (2001) did not observe higher liana abundances in fragmented area, but did find increases in diversity. Additionally, tropical forests being harvested have increased liana abundance and some by 40% in just 17 years (Schnitzer, 2011).

Lianas’ large canopies, high reproductive outputs (at the cost of structural support(Schnitzer and Bongers, 2002)) plus Zhu and Cao’s 2010 observation that lianas in South Western China have higher photosynthetic rates compared to trees of the same region, exemplify how lianas compete with trees for resources. Furthermore, underground competition for nutrients are thought to play a significant role in liana distributions and colonizations (Laurance et al 2001, Leight-Young et al, 2010), but are difficult to observe. Not only can they out compete trees for resources, but liana can climb up trees to steal their precious light!

There are many mechanisms employed by lianas to reach a forest canopy including, stem twining, clasping tendrils, thorns and spines, down-ward pointing hairs and adhesive adventitious roots (Schnitzer and Bongers, 2002). Leight-Young et al (2010), observed that the larger a tree’s diameter, the more root climbers were observed. Of course, tree architecture also plays a role in what kind of liana might colonize it.

Because of their ability to colonize disturbed areas there is concern about lianas suppressing forest regeneration by shading out plants important to succession. While having lower above ground biomasses than trees (lianas: 5-10%, trees: 90%), lianas can also slow tree growth. These factors: deforestation, colonization by lianas and decrease tree growth and regeneration suppression all decrease the amount of carbon being sequestered. Soil homogenization may also occur because of high foliar nitrogen and phosphorous as well as short leaf life-spans (Zhu and Cao 2010). Soil homogenization has the possibility of limiting growth of plants adapted to specialized soils (Schnitzer et al, 2011).

So, it would seem, from the information I’ve included, that lianas are bad. They take over light gaps, prevent other perhaps valuable trees from growing and regenerating the forest, decrease regeneration rates and facilitate soil homogenization. Lianas do provide structural diversity for forests, from which plant and animal life does benefit. They do contribute to biodiversity and may play an integral role in maintaining it because their ability to pull down trees and provide light gaps (Schnitzer et al, 2011).

Although this is my first foray into the world of existing liana research, it seems as though research does paint lianas in a negative light, despite acknowledgement of their cool ecology. Tropical inhabitants rely on their forest for income and sustenance. If lianas are portrayed as detriments to forests, it is possible their conservation may be neglected (despite their apparent increase in abundance, deforestation ultimately means less liana habitat). More research is likely needed into liana forest dynamics and their ecological role.

In my opinion, people are reluctant to change unless it has an economic benefit. By surveying ethnobotanical uses of lianas, results may garner support in effort for their conservation. For example, a survey conducted within a 1-ha plot of Amazonian Ecuador found 46 out of 98 liana species to have a use. The uses range from lamp fuel to music and construction material to edible material, and of course, ritualistic and medicinal uses. There is so much more to learn! I’ll end it here, but leave you with these questions in my head:

Is there a trend between lineage and liana climbing mechanism?

How are the different climbing mechanisms correlated to forest age, tree diameter and tree architecture?

Do lianas have host preferences and how do they range within a species?

Is there an ethnobotanical solution to liana conservation?

Works Cited:

Laurance, W.F., Perez-Salicrup, D., Delamonica, P.,Fearnside, P.M., D’Angelo, S., Jerozolinski, A., Pohl, L. and Lovejoy, T.E. 2001. Rain forest fragmentation and the structure of Amazonian liana communities. Ecology 82 (1): 105-116.

Leight-Young, S.A., Pavlovis, N.B., Frohnapple, K.J. and Grundel, R. 2010. Liana habitat and host preference in northern temperate forests. For. Ecol. And Management 260: 1467-1477.

Londre, R.S., and Schnitzer, S.A. 2006. The distribution of liana and their change in abundance in temperate forests over the past 45 years. Ecology 87(12):2973-2978.

Paz Y Mino C., G., Balslev, H. and Valencia, R. Useful liana of the Siona-Secoya Indians from Azmazonian Ecuador. Economic Botany 49 (3): 269-275.

Schnitzer, S.A. and Bongers, F. 2002. The ecology of lianas and their role in forests. Trends in Ecology and Evolutions 17 (5): 223-230.

Schnitzer, S.A., Bongers, F., and Wright, S.J. 2011. Community and ecosystem ramifications of increasing lianas in neotropical forest. Plant Signaling & Behavior 6:598-600.

Zhu, S. and Cao, K.F. 2010. Contrasting cost-benefit strategy between lianas and trees in a tropical seasonal rain forest in southwestern China. Oecologia 163: 591-599.

Black Walnut Fudge

Black Walnut Fudge

see post:

http://talltreesandmoss.blogspot.com/2011/12/eastern-black-walnuts.html

Organic, Tree-hugging Vegetarians Save World!

Overview and thoughts on “Solutions for a cultivated plant” by, Foley et al 2011

As the human population continues to grow exponentially, Foley et al. (2011) demonstrate current agricultural methods are failing. Through analyses of geospatial data models, the authors explain these failures and define the state of current global agriculture. They suggest four key strategies to increase global food availability by 100 to 180%.

The first strategy aims to stop expansion of agricultural lands, which currently occupy 38% of Earth’s land mass not permanently covered by ice. Of that land, 3.38 billion is pastureland and 1.53 billion acres is cropland. Agricultural land has increased by 3% between 1985 and 2005 mostly at the cost of tropical forests, resulting in a decrease of biodiversity and increasing greenhouse gasses, while contributing little to global food demands. The authors argue that agricultural expansion would disrupt essential environmental processes facilitated by sensitive ecosystems.

Despite the 3% increase in agricultural land from 1985 to 2005, the 20% increase in crop production during that period resulted from higher crop yields. These yields are thought to have resulted from fewer areas in fallow, fewer crop failures and mutli-cropping practices. Estimated crop production could increase by 28% or 58% if crop yields were 75% and 95%, respectively. However, with more production per acre, crops may require more nutrients.

The third suggestion the authors extend is resource efficiency. Fertilizers cost money to produce, purchase and apply; Overuse wastes resources, has potential to pollute water and harm marine life. However, appropriate use and accessibility could increase productivity. Irrigation management coupled with use of plants best suited for environmental conditions can reduce water usage would also increase crop production.

Finally, the authors present a provoking, but simple way increase crop production: Feed humans crops that are currently grown for livestock or other purposes. Such a shift could increase crop production by 49%. However, areas unsuitable for crops could benefit in terms of calories from pastoral livestock. As it stands, 35% of cropland is devoted to fodder. In other terms, about 75% of agricultural land is directly used for animals. Creating ways to reduce post-harvest crop losses, over 40% in developing countries, would also increase available food quantities. It is interesting to know consumers and retailers of industrialized countries can waste over 40% of post-harvest crop.

The paper mentions 1 in 7 are malnourished, but doesn’t define the food deficit in terms of kilocalories, nor does it suggest how much crop production should have increase between 1985 and 2005 to feed the population. Because the food deficit isn’t known the conclusion of, “[increasing] global food production by 100-180% [and] meeting projected demands (Foley et al. 2011),” becomes slightly ambiguous. Only two ways to increase crop production were assigned percentages; a maximum of 49% from livestock conversion and 58% from higher crop yields, which doesn’t add up to 180%. Consequently, the readers must assume the remaining 73% increase is from a combination of other strategies mentioned in the paper but without values.

Throughout the paper the authors emphasize sustainable agricultural practices. Simple practices to increase production like mulching to reduce water loss, adopting some organic practices and providing better access to better crops were touted. None of the ideas presented to sustainably increase food production are necessarily new, but the authors consolidate them and support them with compelling global analyses. They acknowledge all four strategies must be used in concert to achieve their claimed increase in crop production. It is likely more collaborative efforts and ideas will be necessitated from shortfalls in global crop production. With sustainability creeping into the academic world, it will be interesting to see if integrative sciences test permaculture’s merits. From the evidence presented by Foley et al 2011, organic, tree-hugging vegetarians may be ahead of the global food crisis curve.

Foley, J.A., Ramankutty, N., Brauman, K.A., Cassidy, E.S., Gerber, J.S., Johnston, M. Mueller, N.D., O’Connell, C., Ray, D.K., West, P.C., Balzer, C., Bennett, E.M., Carpenter, S.R., Hill, J., Monfreda, C., Polasky, S., Sheehan, J., Siebert, S., Tilman, D. & Zaks, D.P.M. (2011). Solutions for a cultivated planet. Nature 478: 337-342.

check out the website for some cool "supplementary information" at the bottom of the page: http://www.nature.com/nature/journal/v478/n7369/full/nature10452.html

Eastern Black Walnuts

This post concerns eastern black walnut (Juglans nigra). Why? Being aware of their edibility and never having tasted a black walnut, I decided to take advantage of their abundance while living in Belgrade Lakes, Maine. Black walnuts have highly valued wood and interesting ecological significance in addition to their tasty nuts.

Two species closely related to black walnuts are the English walnut and the butternut. The English walnut (Juglans regia) is common to grocery store mixed nut selections and native to Europe. Like black walnuts, butternuts (J. cinerea) are native to Eastern North America, have edible nuts and are common ornamental and forest trees. I vividly remember collecting neighbors' butternuts in a bucket for squirrels when I was a child: Pericarps adhered uncomfortably to my bare feet; grime stuck to my hands and stained my clothes.

The pericarp, the outermost layer of the black walnut, differs from the butternut's. The butternut's is thin and sticky; the black walnut's isn’t and can be quite thick. The outer pericarp is often called the "husk," it is green at maturity, gradually turns yellow, softens and will eventually turn black. Having an almost citrus-like scent when fresh, the husk will stain skin black. Inside the husk lies the hard, rough inner pericarp. Cracking this will reveal the "nut meat", which is, in fact the seed's cotyledons. This website has a good explanation on nut anatomy: http://waynesword.palomar.edu/ecoph8.htm.

I collected roughly two hundred black walnuts while in Maine. The first batch of 75 I neglected, their outer pericarp turned black and started to grow mold. After removing the rotting husk with a hammer and knife (to scrape the gunk off), I placed the nuts back into the 5-gallon bucket I collected them in-bad idea. It was too moist, mold continued to grow on them. So I tried to heat them in an oven to kill the mold, but wound up desiccating the nut meat.

The second batch I collected also started to rot, but this time, after removing the outer pericarp, I placed them in a cardboard box. Because they were only layered 2-nuts deep moisture wasn't trapped and no mold grew. I then placed this cardboard box on a radiator, which helped reduce moisture and "cured" the nut meat. Curing is essential if you are going to consume the nuts. Usually, it takes a couple months. I believe it only took a couple of weeks on the radiator because of the constant heat.

Once the nuts cured, I set to work cracking the inner pericarp with a metal vice. Of course, I was wearing safety glasses and gloves to protect myself from any shell shrapnel. Despite reading a couple informal methods on cracking the nuts, none seemed to prevent damage to the cotyledons. The result: hours of picking through shell debris and meat extraction with a cake tester. Eventually, I would up with about two and a half cups of meat. Obviously, I was (and remain) frustrated that I wasted at least four hours "husking" and six hours "shelling", not to mention the black fingers and fingernails that resulted from both processes. And by the way, this stain can last for weeks of your skin. Those F***ING nuts better taste like ambrosia, I thought. Honestly though, the nuts taste pretty good and I will likely them in a fudge. If I had to describe their flavor, it would be similar to English walnuts, a little sweeter with a slight hint of rum. Evidently, the black walnuts can be for dyes and medicines (5).

I recently learned that there are a few different cultivars of J. nigra, some of which are better for nut production, others for timber. Cultivars best suited for nut production are grown in orchards and can be trellised for easy access. The nut cultivars apparently have thinner shells, making them easier to crack, avoiding my problem of nut meat fragmentation (9). One acre of trees is capable of producing 2000 pounds of nut meat, which can sell for 15 dollars per pound-that’s about $30,000 per acre if you don’t subtract costs of harvesting and husking-a considerable amount of money (7). Other sources indicate a range in price from $443 to $2,844 per acre, when sold for 0.07 cents per pound (3). Cultivars grown for their timber can fetch $2,472 per acre. However, the USDA and Illinois Department of Forestry published a flier with prices from $130 to & $1500 per board foot (board foot=1ft x 1ft x 1in) and up to $2200 if delivered directly to a mill. Black walnut and other timber prices can be found here: http://web.extension.illinois.edu/forestry/il_timber_prices/index.html.

A professor of mine once mentioned that mature trees can be worth up to $100,000, and I suppose that is true, since mature black walnut can be 150 feet tall with diameters of 8 feet (2). Let’s say you have a 2-foot diameter tree that is 150 feet tall (with these dimensions, the tree would likely be top-heavy; the trunk probably wouldn’t support the canopy). Keeping in mind the diminishing size of the trunk and branching, let’s say the trunk reaches 6o feet before branching or decreasing in diameter (also unlikely). Using these measurements, you can have twenty 60 foot x 1 foot x 1 inch boards. This comes out to be 1.8 million dollars for that 60-foot trunk. That’s a lot of money. Obviously, this calculation is a best case scenario.

Before you start your black walnut orchard, you should probably know they do best in well drained, nutrient-rich soils (2, 12). They require full sun, which can cause their trunks to branch close to the ground. I assume this low branching would decrease the value of the wood for three reasons: smaller diameter, curvier trunks and knots. It would be possible to train and trim your tree to grow vertically with one trunk, don’t fret. Plant your walnuts now, because it will take about 75 years for them to reach 80 feet with optimal conditions (11). Luckily, the walnuts are easy to propagate.

After husking them all they need is a little stratification. 120 days at 35-45 degrees F should do it (7). Plant the seedlings in fall. There are a number of cultivars to consider as I mentioned earlier. Most cultivars need to be grafted (5). Make sure you select a cultivar or rootstock that is best suited for climate and soil. You probably don’t have to worry about this if you collect black walnuts from a tree close to your planting location. Additionally, the trees require at least 170 growing days and an average yearly temperature of 55 degrees F. Given its natural range, the black walnuts probably tolerate most USDA hardiness zones.

Most of the information I’ve collected seems to be from the Midwest or South, leading me to believe that is where most black walnut orchards exist. Plus, I haven’t heard of any in the Northeast. Walnut species native to western states, J. californica and J. hindsii, are under threat from Pityophthorus juglandis, a beetle and Geosmithia morbida, a fungus (4). The beetle is common to Southwestern states and does little to harm walnut trees as it burrows into twigs and trunks. The fungus, however, transported by the beetle produces cankers that girdles and kills trees in as little as 3 years (13, 4). Multiple beetle wounds can result in multiple cankers, giving the disease its name: thousand cankers disease. Thousand cankers disease has the potential to reach eastern states and devastate J. nigra populations. Butternuts could also be at risk, but they are already experiencing depressing declines resulting from a separate pathogen, Sirococcus clavigignenti-juglandacearum (8). Thankfully, J. nigra is rarely infected by the butternut’s pathogen (7).

This information is a little scary. Perhaps now is the time to start hybridizing resistance Japanese walnuts with susceptible American species (7). It may be difficult to grow other plants within proximity of eastern black walnuts because of the allelopathic chemical juglone (5-hydroxy-l,4-naphthoquinone if anyone was curious) produced by black walnuts (10, 6). Allelopathy is the inhibition of plant growth by a phytochemical. Most allelopathic chemical are secondary metabolites. It is generally accepted that juglone inhibits respiration and photosynthesis (1). Although, I don’t believe the exact inhibition mechanism is known. I didn’t search exhaustively, but there also seems to be lack of research on intraspecific J. nigra allelopathy. Maybe this is because J. nigra exhibits no noticeable growth limitations in orchards, meaning it has juglone tolerance. It makes sense that it would have tolerance, but I know spotted knapweed exhibits inter- and intraspecific competition resulting from its allelopathic chemical catechin. Nevertheless, what are the effects of juglone on J. nigra seedlings? Different cultivars? Rootstocks?

Anyways, some plants are tolerant of juglone, like black raspberries and cherries (1). Mmm… black raspberries, cherries and black walnuts, all within an arm’s reach. Doesn’t that sound amazing? If growing black walnuts it is important to consider how they will interact with nearby plants or gardens. As with any garden, one must do their research. Other thoughts to ruminate are the implications of allelopathic tolerances in plant ecology and defining plant communities.

In conclusion, black walnuts are a valuable tree, worth planting. It can serve as a food source for humans and wildlife or provide income. There are many potential pests, especially in orchard monocultures, but planting some may preserve genetic diversity if a pest or pathogen were to start destroying the population. At the very least, planting a black walnut could sequester carbon and decrease your carbon footprint. Growing an eastern black walnut might just give you the satisfaction of explaining allelopathy to your friends, or simply give you some shade on a summer’s day.

Works Cited:

1 Dana, M.N. & Lerner, B.R. 2001. Black Walnut toxicity. Purdue University Cooperative Extension Service. Department of Horticulture.

2 Dickerson, J. 2002. Plant Fact Sheet: Black Walnut. USDA NRCS New York State Office.

3 Garrett, H.E., Jones, J.E., Kurtz, W.B., & Slusher, J.P. 1991. Black Walnut (Juglans nigra L.) agroforestry-its design and potential as a land-use alternative. The Forestry Chronicle 67 (3): 213-218.

4 Garvey, K.K. “Beetle and Fungus One-Two Punch Threatens Black Walnut Trees, Scientists Warn” UC Davis Department of Entomology, 2 July, 2009. Web. 23 Dec. 2011. <http://entomology.ucdavis.edu/news/walnuttwigbeetle.html>.

5 Hurteau M.D. 2003. Plant Guide: Black Walnut. USDA NRCS National Plant Resource Center.

6 Jose, Shibu & Gillespie, A.R. 1998. Allelopathy in black walnut (Juglan nigra L.) alley cropping. II. Effects of joglone on hydroponically grown (Zea mays L.) and soybean (Glycine max L. Merr.) growth and physiology. Plant and Soil 203: 199-205.

7 McKenna, J., Ostry, M. & Woeste, K. 4^th International Workshop on the Genetics of Host‐Parasite Interactions in Forestry Eugene, OR USA 2011. “Screening Butternut & Hybrid

Butternut for Resistance to the Butternut Canker Canker Fungus.” USDA-Forest Service, Northern Research Station–HTIRC at Purdue Web. <http://ucanr.org/sites/tree_resistance_2011conference/files/121573.pdf>.

8 Ostrsy, M.E., Mielke, M.E. &, Anderson, R.I., “How to Identify Butternut Canker and Manage Butternut TreesUSDA Forest service, North Central Forest Experiment Station, Northeastern Area, S&PF Region 8, S&PF. 1996. Web. 23 Dec. 2011. .” < http://na.fs.fed.us/spfo/pubs/howtos/ht_but/ht_but.htm>.

9 Reid, W., Coggeshal, M., & Garrett, H.E. Growing Black Walnut for Nut Production. Agroforestry in Action. U. Missouri Center for Agroforestry.September 2009.

10 Reitveld, W. J. 1983. Allelopathic effects of juglone on germination and growth of several herbaceous and woody species. J. Chem. Ecology 9(2): 295-308.

11 Schlesinger R. & Funk, D.T. Managers handbook for black walnuts. North Central Forest Experiment Station. Forest Service. USDA. General Technical Report NC-38.

12 Schesinger R.C. & Williams, R.D. 1984. Growth response of black walnut to interplanted trees. Forest Ecol. & Management. 9: 235-243.

13 Steven Seybold, Dennis Haugen and Andrew Graves.2011. Thousand Cankers Disease. Pest Alert. USDA Forest Service.

Purpose:

With the creation of this blog, I intend to: 

1:  get in the habit of writing  in order to improve my ability to communicate ideas and concepts

2: display my cognaissance/comprehension of scientific publications, which will, hopefully, improve with readers' feedback.

3:  disseminate my love for plants and other relevant topics with others.

4:  record worthwhile observations

I hope to post at least once a week. The subjects may vary, but I intend to cite sources to support any conclusions I make. In general, I will try to remain objective when relating certain information. However, the next post will likely be about black walnut ecology, its practicality as a food and as a timber crop. I may take some liberties expressing my opinion with it practicality as a food source. That said, this blog is to record various queries I have, for myself and others. My only hope is that others find it appealing; my brother doubts this.

As this is my first blog, I'm sure I will meddle with formatting and make frequent e adjustments at first.