Azalea
Rhododendron spp.
ShrubAbout Azalea
Azaleas are popular flowering shrubs in the Rhododendron genus, prized for their spectacular spring blooms in a wide range of colors. Both deciduous and evergreen types exist, thriving in acidic, woodland conditions. They are widely used in foundation plantings and shade gardens across the eastern and southern United States.
Quick Facts
How to Identify Azalea
- Funnel-shaped flowers in clusters, blooming in spring
- Leaves are smaller and thinner than those of large-leaf rhododendrons
- Deciduous types have brilliant fall color in orange and red
- Evergreen types retain small, dark green leaves year-round
- Multi-stemmed, mounding habit
Care Guide
- Water consistently; azaleas have shallow roots and dry out quickly
- Prune immediately after flowering to avoid removing next year's buds
- Mulch with pine bark or needles to maintain acidity and moisture
- Avoid deep planting; set the root ball slightly above grade
- Fertilize sparingly with an acid-forming fertilizer in spring
Known Issues (3)
Japanese Beetle
MODERATEAn invasive beetle introduced to New Jersey in 1916. Adults skeletonize leaves of over 300 plant species while larvae (grubs) damage turf grass roots. They are particularly damaging to linden, birch, and fruit trees.
Affecting 35 regions
Powdery Mildew
LOWA widespread group of fungal diseases that produce a distinctive white powdery coating on leaves and shoots. It affects hundreds of tree, shrub, and plant species. Unlike most fungi, it thrives in warm, dry conditions with high humidity.
Affecting 49 regions
Phytophthora Root Rot
HIGHA group of water-mold diseases that attack the roots and root collar of many tree species. Phytophthora thrives in wet, poorly drained soils. It destroys fine roots and can girdle the trunk at the soil line. Affected trees show a general decline that is often misdiagnosed as drought stress. Oaks, dogwoods, rhododendrons, and many other species are susceptible.
Affecting 31 regions