I just got back from the nursery, and they had packages of steinernema feltiae in a refrigerator. The nematodes are in a sponge. I think you soak the sponge in warm water and pour the water into the plant. (I can't read the directions that well because I haven't opened the package yet, and the sponges are in the way of the text.) I'm going to apply them this afternoon.
Thank you again Nutrax!
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red_parrot_girl
Pro tip