im buying this on this link below
Each box covers 40 sq ft. 4ft X 10ft = 40 sq ft so you will need 1 box.
Hi I can tell you from experience as a gardener/landscape designer not to plant a tree. First, tree roots and trunk will eventually grow outside of the property line and will be choked up against the fence -- and either the fence or the tree will eventually have to go. Finally, tree trunks aren't actually that good of a screen. The solution: shrubs. There are many many kinds of shrubs, that grow wuickly, and create a dense, brod cover. The are easier to care for longterm than trees, also. Plus, most have lovely flowering seasons. You need to consider your climate as well as sun exposure. Southern exposure may indicate that a dought tolerant plant would be best. Check the bookstore for local choices. Here in the great basin of Nevada, Lilac is often a perfect choice, or also Spyrea (which are also hardy to even the toughest soils like clay). Another thing to remember is to look for non-deciduous species - that means they will keep foliage year-round, so will provide constant privacy.
