Wussywat discovers compost and how to make it. Wussywat helps Ortus put compost on his cabbage seedlings but when it runs out, it's up to Wussywat to see if he can find some more. Maybe Ird can help? No, she's just eaten loads of apples and is too full to fly. How about Oggy, who is playing in the grass cuttings? No, even his super-sniffer can't find any more. Wussywat trudges back to tell Ortus the bad news, but when Duckadile points out he's covered in bits of apple, leaves and grass Wussywat has the idea to create a brand new compost heap out of all the stuff! What a clever cat!