So I decided to go ahead and transplant all three of the Durban Poison into the bed. They look a little stressed at the moment, but should snap out of it in a day or two. Transplanting disturbed the soil more than I would have liked, but it did give me an excuse to check out what's going on in there. I used a knife to cut the hole, then lifted out the soil rather than compacting it with a trowel. Each hole was crawling with worms big and small. Some soil mites and a couple fungus gnats were all buzzing about.