Black Walnut

Vegetables affected by Black Walnut Toxicity

• Cabbage, Brassica oleracea capitata
• Peppers, Capsicum species (some)
• Tomatoes, Lycopersicon esculentum
• Flowering Tobacco, Nicotiana alata
• Petunia species and cultivars
• Eggplant, Solanum melongena
• Potato, Solanum tuberosum
• double-flowered cole vegetables 
• Trees affected Apple, Lilac, azalea, mountain laurel, rhododendron, red pine
•  blackberry, blueberry

The toxic zone from a mature tree occurs on average in a 50 to 60 foot radius from the trunk, but can be up to 80 feet. The area affected extends outward each year as a tree enlarges. Young trees two to eight feet high can have a root diameter twice the height of the top of the tree, with susceptible plants dead within the root zone and dying at the margins.

 Walnut leaves can be composted because the toxin breaks down when exposed to air, water and bacteria. The toxic effect can be degraded in two to four weeks. In soil, breakdown may take up to two months.

So by this list I will have to plant these near the back of my yard. Where I started planting the tomatoes.