No dig gardening is an approach to cultivation favoured by many organic gardeners. The primary reasons for digging the soil are to remove weeds, to loosen and aerate the soil and to incorporate organic matter such as compost or manure. However there is a strong case against digging, which argues that in the long term it can be deleterious to the soil's health. Whilst digging is an effective way of removing perennial weed roots, it can also cause dormant seeds to come to the surface and germinate. Digging can also damage soil structure and cause problems like compaction, can disturb and damage balances amongst soil life and by exposure to the air, tends to burn up nutrients which then need to be replenished.