Tree roots need adequate volumes of soil in which to grow, along with access to nutrients, water and oxygen. Tree roots can also impact adjacent utilities and foundations of buildings. It is important to get the below ground design and specification right alongside choosing the right tree in the right place.
Tree pits in hard surfaces should have a surface opening that is as large as the space allows but must be a minimum of 1m square. The pit should be left open and incorporate layers of ground cover planting. It should not be surfaced with paving materials. Initially the tree pit should be filled with organic mulch to a depth of 50mm to 75mm, which will help the tree establish itself by regulating temperature, moisture and providing nutrients.
Permanent ground cover pl