This tomato plant has been damaged by herbicide residue.

Compost made with livestock manure is an excellent soil amendment for vegetable gardens. Compost improves soil structure, provides nutrients and helps optimize soil pH. However, gardeners should be aware that cow and horse manure sometimes contains residues that can damage certain plants.

I recently visited the garden of a friend who had noticed discoloration and deformity on tomato and pepper plants after mulching with composted manure she had obtained from a nearby farm. The damage appears to be caused by residual herbicide.

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