There's like 4 dupes of the "I got an invalid botania flower after using it on a quark flower pot" bug on the Botania issue tracker, and unless you want to deal with Botania's crazy nbt flowers in the flower pots, probably best to just blacklist them by default.

floatingspecialflower is also worth a test.

I would have sent a little PR for this, it's a one-line change, but I can't get the damn mod to build lmao