French marigolds deter nematodes. I have a real problem with nematodes because the soil around here is very sandy, and nematodes thrive in sandy soil. So I always buy seeds in the spring and sow them in the Vegetable Garden as soon as the weather starts to get warm in very early March - at the same time as I set out my tomatoes. But it isn't until fall that marigolds really start to get going. They are so pretty in the fall.
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