How do you revive overgrown azaleas?
Written by
Tina Carter
Reviewed by
Prof. Samuel Fitzgerald, Ph.D.Overgrown azaleas and rhododendrons lose their natural shape and bloom potential, becoming woody and sparse, as a result of their excessive growth. Rejuvenation pruning affords a complete reset of shrubs that are cut severely back. This technique is most effective during late winter dormancy, before the onset of spring growth. Healthy plants will completely recover in two growing seasons and bloom vibrantly once again.
Preparation Phase
- Timing: Late winter before bud swell
- Tool Sanitization: Disinfect saws with 70% alcohol
- Hydration: Water deeply 2 days prior
- Safety: Wear protective eyewear and gloves
Cutting Technique
- Height: Reduce to 12 inches (30 cm) from ground
- Angle: 45° cuts above outward-facing nodes
- Large Trunks: Use pruning saw for stems >2 inches (5 cm)
- Stagger Cuts: Vary heights between branches
Immediate Aftercare
- Fertilization: Apply 10-10-10 acidic formula
- Mulching: 3 inch (7.6 cm) pine needle layer
- Watering: 1 gallon (3.8 L) per foot of height weekly
- Pest Control: Apply horticultural oil spray
Important points must be considered before rejuvenating the plant. Only healthy plants are capable of standing the violent treatment. The best plants to rejuvenate are those over fifteen years old. The pruning should be done in late winter, when the plants are in a dormant state, typically around the middle of February. Avoid work during drought years.
Monitoring after pruning helps avoid future difficulties. Check once a week for new growth, indicating recovery. Remove all dead wood at once. Watch for borers in the cut surfaces. Protect delicate shoots from late frosts by putting burlap covers over them. Your patience will be rewarded with richly blooming azaleas.
Read the full article: When to Prune Azaleas: Your Complete Guide
