Science · High-Value Shrubs
Azalea & Rhododendron
Spectacular spring color on shallow, fine roots that are very sensitive to both drought and saturation.
Rhododendron spp. · Flowering shrub
Profile
- Zones
- USDA 4–9
- Size
- 2–15 ft
- Soil
- Acidic, well-drained
- Roots
- Very shallow, fine
Water & soil targets
- Moisture (VWC)
- ~22–30%
- Salinity tolerance
- Poor
- Drought tolerance
- Poor
Never let roots dry fully, and never let them sit in water.
Problems to watch
- Phytophthora root rot
- Lace bugs
- Iron chlorosis
Stress signs
- Wilting despite wet soil (rot)
- Leaf curling
- Yellowing between veins
Where you'll find it
- Golf courses (Southeast)
- Estates
- Botanical gardens
More high-value shrubs
All Science profilesGeneral agronomic guidance and typical ranges; actual targets vary by site, soil, climate and season.