EDIT: Okay. The only way they are "Harvestable" is if you destroy the crop itself, which gives the fruit, and the seed. However, this means you have to replant the seed.

Still, You cannot use fruit.... which means you can't really do anything with this mod other than make gear.

Everything is fine with the fruits, you juste have to place them in a crafting grid (inventory or crafting table)

you have to use the knives to auto-replant the crops. I will check for the fruits