A friend was looking for an app so I explored some FOSS ones. It might be helpful to take it a step further and self host it so that family members can coordinate care.
I saw this which looks interesting
https://github.com/MDeLuise/plant-it/#features-highlight
Open to regular FOSS apps as well!
I only know of plant-it and hortusfox. I tried both.
I find plant it to be superior. Also, the dev is very nice and open to suggestions and usually implement them pretty quickly.
YMMV