Rhododendron ‘Delaware Valley White’
Overview
Uses: Foundation plantings, low hedges, mass plantings, and part-shade beds.
Benefits: A classic white azalea with large, lightly fragrant white flowers in mid-spring. A reliable choice for brightening shady foundation plantings and woodland edges.
USDA Hardiness Zones: 6–9
Sun: Partial Shade to Full Sun
Life Cycle: Broadleaf Evergreen Shrub
Growth Habit: Rounded, Mounding — dense and compact.
Bloom Color: White (fragrant)
Foliage Color: Glossy Dark Green
Mature Height: 3–4 feet
Mature Width: 4–5 feet
Bloom Season: Mid-spring
Growth Rate: Moderate
Summary
The white azalea that generations of gardeners have planted by the front door.
Delaware Valley White has been a standard in American gardens for decades, and it has kept its place for good reason. In mid-spring it covers itself in large, open, pure white flowers, bigger than those of most compact evergreen azaleas, with a light, sweet fragrance you notice when you lean in close. The clean white shows up from across the yard and makes every other azalea color around it look brighter.
The plant builds into a broad, dense mound about three to four feet tall and four to five feet wide, a size that fills a foundation bed or the edge of a wooded lot without overwhelming it. Glossy, dark green leaves cover it through the year.
White azaleas earn their keep in shade, where they stay visible long after brighter colors fade into the background. Plant it under high trees, on the north or east side of the house, or along a path you walk in the evening.
It does best in partial shade or morning sun with acidic, well-drained soil, the same conditions that suit rhododendrons, mountain laurel, and other acid-loving shrubs.
Care
Delaware Valley White Azalea Care
Plant in partial shade or a spot with morning sun and afternoon shade. Some direct light keeps flowering heavy, but hot afternoon sun can scorch the leaves and attract lace bugs, and deep shade reduces bloom.
Give it acidic, well-drained soil rich in organic matter. Azalea roots are shallow and fine and dislike wet ground, so in heavy clay, amend with compost and plant with the top of the root ball slightly above grade. Spread two to three inches of pine bark or shredded leaf mulch, kept back from the stems.
Water deeply once or twice a week through the first growing season and during dry spells after that. A thorough watering in late fall before the ground freezes helps the leaves come through winter.
Fertilize lightly. One application of a slow release fertilizer made for acid-loving plants, after flowering, is plenty.
Prune only right after bloom, since next year's flower buds form in summer. The broad, mounding shape rarely needs more than a light tidy. In Zone 6, plant out of strong winter wind to limit leaf drop and browning.
Size
What Size is the Delaware Valley White Azalea for Sale Online?
Our Delaware Valley White Azalea ships in a greenhouse-grade grow pot and is appropriately sized for its container at the time of shipment. Plants shipped in fall or winter are past bloom and may show some yellowing on older leaves, which is normal. If you have specific sizing or planting questions, please contact us.
How Large Does Delaware Valley White Azalea Grow?
Expect about 3 to 4 feet tall and 4 to 5 feet wide at maturity, in a broad, rounded mound. Space plants about 4 feet apart for a continuous hedge or mass planting.
Additional Information
Is it fragrant?
Lightly. The flowers have a soft, sweet scent that is easiest to notice up close or on a warm, still day. It is not a heavily perfumed azalea, but the fragrance is a pleasant extra near a doorway or along a path.
Does it pair well with other azaleas?
Yes. White is the easiest azalea color to combine, and Delaware Valley White is often planted between pink, red, and purple varieties to separate strong colors and brighten the whole group. See our full selection of Azaleas.
Will the leaves stay on through winter?
Mostly. It holds much of its foliage through winter, but at the cold end of its range, or after a harsh winter, it may drop a good share of its older leaves before new growth arrives. That is normal for this type of azalea. For more year-round foliage, browse our Evergreen Plants.
Is Delaware Valley White Azalea deer resistant?
No. Deer browse azaleas, especially in winter. Where deer pressure is heavy, protect plants with fencing or a repellent, or look through our Deer-Resistant Shrubs and Evergreens.
