Thanks to everyone for your responses. I had a nice conversation this morning with a gentleman at one of our better nurseries. He recommended putting fresh dirt in the bed. For now, my plan is to replace the dirt. Going forward, I'm going to take a no-holes barred approach. I'll be working lots of organic matter in every season, I'll probably just do a spring garden and let the bed go fallow during the winter except for a cover crop like mustard, I'll be inspecting the roots more closely on every plant I pull up to catch problems when they start, I'll disinfect my garden tools when moving between garden areas, I'll use beneficial nematodes/mycos/Actinovate, I'm going to try grafting some N tolerant rootstock onto some of my extra seedlings, I'll be researching nematocides for future use, as needed, I'm expanding my bucket brigade container garden and I'm trying a couple of N tolerant varieties of tomatoes just to see how the flavor compares to the usual OP/heirlooms. I'm hoping that with a multipronged approach, I'll be able to use my gardening areas for quite a while.
It looks like Florida has a huge nematode problem! If I have to only garden in containers in the future, then that's the way it goes. I'm going to put up a fight first since they haven't hit my main garden. I'm interested in the marigolds as a cover crop/companion plant but it seems they attract spider mites. I don't need anymore help in that department! I've read some other threads here with product recommendations for fighting the little suckers so I've got more ways to fight.
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