How to Get Rid of Moss in Star Magnolia

Transplant a small star magnolia, or a potted one, in a sunny area of your landscape. Although these trees can tolerate light shade, darker areas of the landscape increase the risk of moss growth. Select an area with good drainage such as the side of a gentle slope. Amend heavy soils with organic matter such as aged compost or raked leaves.

Remove large sections of existing moss from the branches by hand. Grasp hanging particles of moss and pull them from the foliage and branches. Peel large sections of moss off the trunk by running your fingertips between the bark and the moss. Remove the bits of displaced moss from the soil around your star magnolia tree.

Prune your tree after it finishes blossoming in spring. Keeping this ornamental tree trimmed back reduces humidity around the branches and discourages the growth of new moss. Trim off all broken and damaged branches with a branch saw or pruning shears. Remove crowded branches to form an open, airy canopy. Haul the trimmed branches off the planting site to avoid the growth of fungus and bacteria in the vicinity of your star magnolia.

Apply a foliar moss control spray to stubborn areas of moss growth. Choose a non-chemical product labeled for use on ornamental trees -- for example, one that contains fatty acid soaps or potassium salts as active ingredients. Apply the product in accordance with the manufacturer’s instructions.