Answer: A few years ago, I grew some Nematocidal Marigolds (T. minuta - what a misnomer!) from Seeds of Change. They turned in to TREES! They have nondescript blossoms that appear only after many months of growth. Their cheif purpose is to repel/kill nematodes in the soil. The foliage is fragrant and attracts beneficial insects to the garden. There may be other species that grow to this height, but they aren't commonly seen in seed catalogs. Seeds of Change can be reached via http://www.seedsofchange.com or toll-free at 888/762-7333.
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