Although today's impatiens varieties are more sun-tolerant than older varieties, too much sun will cause impatiens to have small leaves, few blooms, and little height. Impatiens can be planted under trees although special care is needed, as the tree roots will compete with the flowers for space, water, and nutrients. Impatiens planted here will require frequent watering and additional fertilizer. One easy solution is to construct a slightly raised garden six to eight feet from the tree. Or you can dig out roots, if they are some distance from the tree, and fill the holes with a soil mix for planting.
Bedding plants are available at most nurseries and garden centers.
Select plants that have a bushy appearance and healthy foliage. New Guinea impatiens also may be started from seed six to ten weeks prior to planting outdoors. This hybrid tolerates more direct sunlight and grows taller than traditional varieties. Harden off seedlings before transplanting outdoors. Be sure to wait until the danger of frost is past before planting in the garden.