Y ' know after seeing that image of Knuckles being an agriculturer I can't help But to headcanon that he knows how to cultivate the land really Well, afterall he does have amazing digging skills. Maybe he can also cultivate hot Peppers essential for Chili and he likes to sell them to Sonic at a high price just to screw with him for all the times he called him a knuclehead! Not that he actually needs the Money anyway
I too headcanon that in the interests of actually having a steady and accessible food source on Angel Island, Knuckles does have an area where he grows his own fruits and vegetables.
I like to think that the grapes in Gens’ Sky Sanctuary hub area are what he planted because we all know how much he loves them.