It should practically ''reset'' the flower. Loose all progress, but at least you don't have to destroy them. It still happens A LOT with the bulk generation flowers, specifically the Thermalily, that it gets stuck on full mana bar but does not transmit it.

I think it'd be better to just try to fix that bug, once I actually manage to reproduce it, which I've never.

I will send you a world save + the modpack I am using when it happens again.