i'd like to be able to add them with a datapack or something.. maybe a config option even, perhaps there is a way, i only tried searching for about 15 minutes and i'm not the best at discovering what im looking for...
i searched here too and only found croptopia issues relating to crashes, idk why that is, i feel like it certainly should be documented somewhere but posting incase it isn't.

Is this for fabric? Are you saying they don't work already? I'm sure forge one has universal plants and crop support

sorry i should've posted version...
Croptopia-1.19.2-FORGE-2.1.0
i tried a whole bunch of the seeds

This is not on my end. I'm using forge IPlantable interface and IForgeBlock::canSustainPlantLife one which should guarantee that planteers support all plants (that impleent that) which for a forge mod should be all crops. I see that that is a cross loader mod so I suspect they are skipping over forge api causing poor compatibility such as this. That's also why I dont really like the multi loader environment since it leads to poor code like this and also what I try to avoid to the cost of longer dev times for my mods. Anyways this is an assumption but I'm quite certain of it. Note that adding a forge specific interface can be done with a mixin that target somebody's own class. I'll close this, you might want to report to them if you want it fixed