Plant Allelopathy - Knowledgebase Question

Baldwinville, MA
Question by techman1
May 19, 2001
I am looking for a list or resource where I can find out what plant like each other or, more appropriately, don't like each other. I am looking for an answer to what plants should NOT be planted next to each other. Thank you.


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Answer from NGA
May 19, 2001

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I'm not sure there is such a listing. There are plenty of books on companion planting--what plants seem to enhance each other's growth--but not nearly as much is written about plants that "don't get along".

The term allelopathy refers to the way organisms interact, and the effects they have on each other. The most well-known example of allelopathy in the garden involves black walnut trees. The black walnut tree and its close relatives produce a substance called juglone, which inhibits the growth of many trees, shrubs, flowers, and vegetables.

Here's an interesting site from Montana State University: http://www.montana.edu/wwwpb/a...

I searched the web using the words "allelopathy" and "garden" and came up with some interesting sites. You might also search using "allelopathy" and "plants".


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