We have a rental home with an east facing garden. Our tenants want to pave the back garden, removing all grass. In summer the grass is lush but it turns into a mud bath for many months. They have a raised paved patio at the back and a slab path down the middle of the lawn. I want them to enjoy the garden but am reluctant to allow them to ditch all the grass. Is this mean of me? Am worried about biodiversity loss and also whether we will be able to reinstate the grass easily at some point if it is paved over. What can we do about drainage? Is there a more low maintenance version of grass in an east facing garden that is more eco-friendly than slabs?