I live in rented, have a bed in front garden that cats always poo in. It was covered in daffodils and tulips literally thousands of them. Iv pulled them all out (still bulbs in the ground) and for summer to spring in going to cover the bed with membrane, have 2 lovely glazed pots to sit on the top of it. I'm not planting plants in the ground, the soil is like clay, rock hard and don't have time to constantly weed etc. what would be the best to put over the membrane? We have shingle down the side of the house that the cats always literally every night pooed in but for some reason after a few months of us living me here it stopped, but I heard not to use shingle as its like a cat litter tray? What would they not likely to walk and poo on? Plum slate?
Tia