Year 5, Spring, Sebastians Request

Hey,

So I just got into year 5 of SOS Awl, and Sebastian is put a request onto the board. I fear though that it's some weird translation error (I don't play the game in English), because the request says he wants some "modified crop", and I've tried to give him a Gen 2 and Gen 3 crop, as well as a Gen 2 and Gen 3 tree fruit and he won't accept either of them. (Gen 1 crops also don't work.) Can someone tell me please what the frick this guy wants of me? :') Which crops (if any!) will he accept?

Thanks!