Glaucous Swamp Azalea

Rhododendron viscosum var. glaucum

$23.00 Sold out

1 Gallon | Hardiness Zones 4-9

The Rhododendron viscosum var. glaucum, commonly known as the Glaucous Swamp Azalea, is a remarkable native plant with deep roots in the wetland areas of the Southeastern United States. This deciduous shrub is part of the larger Rhododendron viscosum species, known for its adaptability to moist, swampy environments, and its stunning summer blooms.

Origins and History

The Swamp Azalea is native to a broad range across the eastern United States, from the Gulf Coast up through New England. It thrives in wet habitats like swamps, marshes, and along stream banks, where its roots can access the consistently moist soils it prefers. The variety glaucum is particularly noted for its bluish-green foliage, which adds an extra layer of interest to this already captivating plant.

Historically, Rhododendron viscosum was first described in the early 18th century and has been a part of American horticulture ever since. Its natural habitat and resilience in swampy conditions make it a unique and valuable plant, especially in garden settings where moisture is abundant. Native American tribes are known to have used parts of the plant for medicinal purposes, adding to its historical significance.

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PLANT DETAILS

Hardiness Zones: 4 - 9

Soil: Wet

Sun: Full Sun and Part Shade

Seasonal Behavior: Deciduous

Growth Rate: Moderate

Height at Maturity: 2 - 8 Feet

Spread at Maturity: 2 - 6 Feet

Foliage: The leaves are oblong to elliptic, blue-green (glaucous) on the undersides, providing a distinctive look, especially when the wind blows through them.

Flowers: Produces fragrant, white to pale pink tubular flowers with a sticky texture, typically blooming in late spring to early summer. The flowers are known for their sweet, clove-like fragrance and attract pollinators such as bees and butterflies.

Sticky, white, fragrant

Light Requirements: Prefers partial shade to full sun. Swamp Azalea thrives in partial shade, especially in hot climates, where protection from intense afternoon sun helps prevent leaf scorch. However, it can also tolerate full sun, particularly in cooler regions, which can enhance flowering.

Soil Requirements: Prefers moist, well-draining, acidic soil. Rhododendron viscosum var. glaucum grows best in rich, loamy soil with a pH range of 4.5-6.0. It naturally occurs in wetland areas, so it performs well in soils that remain consistently moist but well-draining. Incorporating organic matter, such as compost, peat moss, or leaf mold, will improve soil structure, increase acidity, and retain moisture.

Watering: Requires regular watering to maintain consistently moist soil. This azalea thrives in wet conditions, so ensure that the soil remains evenly moist, particularly during dry periods. It can tolerate occasional standing water, making it suitable for rain gardens or planting near water features. Avoid letting the soil dry out completely.

Temperature and Humidity: Hardy in USDA zones 4-9. Rhododendron viscosum var. glaucum is well-suited to a range of climates, from the cooler northern regions to the warmer southern areas. It can tolerate cold winters and prefers high humidity, which aligns with its natural wetland habitat. In colder zones, a layer of mulch can protect the roots from freezing temperatures.

Fertilization: Apply a balanced, slow-release fertilizer formulated for acid-loving plants in early spring. An additional light feeding in mid-summer can help sustain growth and flowering. Avoid over-fertilizing, as this can lead to excessive foliage growth at the expense of blooms and can harm the plant’s roots.

Pruning: Prune lightly after flowering to maintain the plant’s shape and remove any dead or damaged branches. Rhododendron viscosum var. glaucum generally requires minimal pruning, as it naturally develops a pleasing form. If necessary, prune in late winter or early spring before new growth begins, but avoid heavy pruning, which can reduce the following year’s blooms.

Pests and Problems: Generally pest-resistant but may occasionally be affected by common azalea pests such as lace bugs, spider mites, or aphids. Ensuring good air circulation around the plant and avoiding overhead watering can help prevent fungal diseases such as powdery mildew or root rot. If pests or diseases are detected, treat with appropriate measures such as insecticidal soap or fungicides.

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