Species swamp azalea
off-white flowers with orange anthers, white filaments, green leaves and brown branches

swamp azalea

Rhododendron viscosum

Swamp azalea is an evergreen shrub with dainty clusters of delightfully fragrant, pure white blooms. It is native to marshy woodland areas in eastern United States and Canada. It usually grows from three to six feet tall, features glossy, dark green leaves with reddish-brown on the undersides, and has long, wiry stems. The flowers appear in mid to late summer and typically last about a month. Magnificently aromatic, the blooms provide valuable nectar for a plethora of pollinators. Perfect for adding a splash of color to the dreary corner of a garden, swamp azalea is an easy to care for, low-maintenance plant.

Cycle:

Perennial

Watering:

Frequent

Propagation:

Cutting,Layering Propagation,Grafting Propagation,Division,Seed Propagation

Hardiness Zone:

4 - 9

Flowers:

White to pale pink Flowers

Sun:

Part shade

Leaf:

Yes

Leaf Color:

green

Growth Rate:

Low

Maintenance:

Moderate

Care Level:

Medium

watering

The swamp azalea should be watered regularly, aiming for damp, not soggy, soil. The best way to tell if your azalea needs watering is to check the soil. If the top 2 inches of soil feel dry, it is time to water. During the growing season, water often enough so that the soil stays moist but not wet. In hot, dry weather, azaleas may need to be watered 2-3 times per week. In the cooler months, the plants can survive with less frequent watering, about once a week or every 2 weeks. However, underwatering can slow down the growth or cause bud drop, so be sure to provide adequate moisture.

sunlight

Swamp azaleas need full to partial sunlight to grow and thrive. The ideal amount of sunlight for a swamp azalea is 4-6 hours of direct sunlight each day. It's important to note, however, that during the hottest part of the day (noon to 3 pm) swamp azaleas should be placed in partial shade to prevent leaf burn and sunscald. If swamp azaleas are not exposed to enough sunlight, their flowers may not open and they may not reach their maximum growth potential.

pruning

Swamp azaleas should be pruned in late winter or early spring. If the bush becomes too large, it can be reduced in size by cutting back specific branches. Light pruning of stems in the middle of the bush is recommended to create an even and rounded shape. Shorten stems to 2-3 buds above the desired shape, while taking care to not remove more than 1-third of the total structure of the bush. Any dead or diseased branches should be removed.

Season

Fall
Winter
Spring
Summer
Sep
Oct
Nov
Dec
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Starts Flowering

Swamp azaleas typically start flowering in April or May.

Hardiness Map