A pretty simple suggestion; A spray similar to fertiliser, but crafted with Wax and such as well. The idea being that it’ll freeze the crop/flower in its current stage, and wont give any prestiege/proximity bonuses nor wilt, until sprayed with a fertiliser or water-spray.
Don’t think it’d be too complex to make, at least. Plus it’d mean people that want to use flowers purely for decoration, won’t have to stock up rare flowers.
…and that my rare exo crystal seeds won’t just wilt and go to waste.