a 'compost heap' = ('chiefly US') a 'compost pile' [=a pile of plant materials that are kept in a garden and allowed to decay to create compost]
We 'compost' leaves in our backyard.
(..) He can't be left alone. You'll be at school and I'll be at the zoo. Amos needs constant care. Someone needs to look after him. Someone has to stroke him. Quick! Down by the compost! Who's going to repair this glass? Look at it! Please... - Damn! - It's not surprising, spring does this. (..)1989 Dva lidi v zoo