How to Grow and Prune Oleander Shrubs

Overview

Oleander (Nerium oleander) is a fast-growing, evergreen flowering shrub native to southern Europe and southwest Asia. Valued for its fragrant blooms in white, yellow, pink, or red from early summer to mid-fall, it thrives in heat and drought. Hardy in USDA zones 9–11; in zone 9, cold may kill top growth, but roots often survive to resprout in spring.

Planting & Early Care

Step 1: Site Selection & Spacing

Plant in spring in full sun and well-drained, moderately fertile soil. Space shrubs 10–12 feet apart to allow for their large mature size.

Step 2: Mulching

Apply a 4-inch layer of mulch around the base to conserve moisture, suppress weeds, and insulate roots. Keep mulch away from the trunk to prevent disease.

Step 3: Watering Schedule

Water every 3–4 days for the first month, then weekly through the first year. After establishment, reduce to once monthly. Withhold water entirely in winter.

Ongoing Maintenance

Step 4: Deadheading

Remove spent flowers as they fade to encourage more blooms and extend the flowering season. Pinch off close to the stem to minimize damage.

Step 5: Pruning

Prune in early spring before new growth emerges, as oleander blooms on new wood. Remove cold-damaged, overgrown, or old branches to improve air circulation and reduce disease risk.