Plant the common snowball tree in full sun, which is eight hours daily. Plant the Chinese snowball in full to partial sun, which is between six and eight hours daily. The soil in the planting site should be well draining, but moist, alkaline and fertile.
Lay a 4-inch layer of organic mulch around the base of the tree to keep down weeds and help the soil maintain its moisture level. The mulch can be wood or bark chips, straw or shredded leaves. Avoid pine needles because they raise the acidity level of the soil.
Apply a granulated fertilizer to the soil around the base of the plant each spring, before the plant sets flowers. Follow package directions for application, and water the granules into the soil.
Water frequently enough to keep the soil moist. The exact frequency depends on your climate.
Prune only if necessary for controlling the size of the plant. Use sharp shears and prune in the fall, after the plant drops the flowers.