Azaleas

Azaleas are very popular flowering shrubs often used in borders, foundation plantings and for naturalizing. They are a form of rhododendron and can be either evergreen or deciduous (lose their leaves in winter). Azaleas can be low and trailing, tall and upright, or anything in between. They are prolific bloomers with flowers in almost every color imaginable. Depending on variety, they will produce single, semi-double or double flower forms and can begin blooming as early as late March or as late as mid June. Some of the newest varieties will bloom in spring and again in late summer or early fall.

LOCATION AND PALNTING

Azaleas prefer partial shade, but will adapt to heavy shade. Heavily shaded Azaleas produce fewer flowers, growing more open in structure than partially shaded plants. Bright, filtered light, under the canopy of tall trees, is the best option. Low tree branches can be pruned to provide early morning and late afternoon sun. Azaleas grow well in a woodland border. Evergreen azaleas will grow in full sun, but are more susceptible to spider mites, lacebugs and whiteflies.

Azaleas prefer a slightly acid, well-drained soil with a pH of 4.5-5.5. (Azaleas will not grow in alkaline soil.) Incorporate a generous amount of Leaf Gro, Super Fines Soil Conditioner, or Peat Moss into the existing clay soil at planting time (1/3 amendments to 2/3 existing soil). If the plant is pot bound, cut the rootball with a sharp knife from top to bottom and loosen the roots. Plant the Azalea with one-quarter to one-third of the root ball above the ground to ensure good drainage. Mulch lightly on top of the roots to help keep the soil moist and prevent the roots from drying out. Water the newly planted azalea thoroughly, and check soil moisture periodically at root depth. Water only if needed.

Azaleas planted near masonry may exhibit chlorosis (yellowing of the leaves) due to the leaching of alkaline chemicals into the soil. Lower the pH by adding sulfur, iron sulfate, or aluminum sulfate according to the labeling on the package.

FERTILIZING AND PRUNING

Fertilize Azaleas in the spring after blooming and again in the fall with Merrifield Flowering Plant Food 10-18-12 or Holly-tone. Replenish the mulch occasionally to add organic matter and provide nutrients.

If necessary, prune right after they bloom and before the plant sets flower buds in August. Pruning can be done at other times of the year, but blooms will be sacrificed. If heavy pruning is necessary, the azalea should respond well provided all leaves are not removed.

Merrifield Garden Center sells many varieties of Azaleas. The following list shows color, sun tolerance and size of the plant at maturity. If you need further assistance, please see a member of our professional staff.