https://www.curseforge.com/minecraft/mc-mods/ferroustry

none of the saplings in the mod linked above for 1.15.2 are compatible with bonsai pots is it possible that you could make these saplings in the ferroustry mod compatible with bonsai pots?

Sorry, I'm personally not supporting any versions below the upcoming 1.18.1 version.
Maybe someone else wants to pick things up for older versions - I simply don't have the time.

I posted data and resource packs for Ferroustry on 1.15.2 here: #178 (comment)