im jelous id love 10 achers im on a waiting list for an allotment as i have a concrete garden, i know you can put nut shells and nuts in the compost, if there salted was the shells first, they are best crushed to help them rot faster, i put mine in a food chopper to obliterate before putting in my compost, i just use leaves for mulch as i grow in pots and havent got much that requires mulching.