Took a soil sample in today to the county agent. I showed him some roots of plants that had died in the raised bed, and he suspects nematodes. We will have to cover the bed with plastic and hope to kill the nematodes. He will ask the lab to confirm his suspicion. Looking forward to hearing what nutrients we need to add. If we can't kill the nematodes, we will have to take all the soil out of the bed and replace it. How badly do I want to garden??