What about a piece of landscape fabric at the bottom of the container so that nothing can come in through the drainage holes? I can't imagine that the nematodes would be able to permeate that, and I doubt they would climb up and over the side of the container.
Although I do think that I am now of the opinion that container media must be replaced every season here. My SWC media lasted 2+ seasons in other climates, but here it seems that 1 is the limit if you want to maximize production.
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