Allelopathic Trees
Trees are great examples of allelopathy in plants. For instance, many trees use allelopathy to protect their space by using their roots to pull more water from the soil so other plants cannot thrive.
allelopathy (adj. allelopathic)
The inhibition of growth of one plant species by another due to the release of chemical substances.
GardenWeb Glossary of Botanical Terms
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Allelopathic: Toxicity from a plant that inhibits the growth of other plants.
Alkaline soil: Soil with a pH above 7.0
Amending soil: To improve the soil usually by adding organic matter.
Allelopathic plants do sometimes pose obstacles that are hard to overcome, however.
allelochemicals search for term- compounds that have an allelopathic effect.allelopathy search for term- n.
Black walnuts contain a chemical called "juglone" which can be allelopathic to other plants.
Others, like rye, oats, and sorghum-sudangrass (I call them the cover-crop "bad boys") have an allelopathic effect on weeds—they actually exude compounds that suppress the germination of weed seeds.
 See also: Plant, Growing, Grow, Grass, Flower
  
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