rbl - I just thought of this, make a collar that fits around the plant covering most of the dirt for the plant. For grass like plants I could use hardware cloth (A sort of 1/2 inch wire mesh) and again a collar fitting as close as I could get. I think it would help keep the humidity down in the cage while keeping the plant alive. That beardies like to dig also gives me the idea to provide a place where it could dig to it's hearts content and not mess up the rest of the enclosure. I'll have to think some more on that! I still have the "Thousands of little Crickets" running through my head.