How to Care for Oleander

Oleander (Nerium oleander) is a tough, evergreen flowering shrub beloved in warm climates for its long summer display of showy blooms in shades of pink, white, red, and salmon. Exceptionally heat- and drought-tolerant once established, it is an easy, low-maintenance choice for sunny gardens and large containers.

Light

Oleander needs full sun to flower well, ideally six or more hours of direct light daily. In shade it grows leggy and blooms sparsely. Container plants overwintered indoors should be kept in the brightest possible spot and returned to full sun as soon as weather allows.

Water

This is a drought-tolerant shrub with low water needs once established. Water regularly the first season to build a deep root system, then reduce sharply; mature plants tolerate extended dry spells and thrive on lean conditions. Container specimens need more frequent watering but should still dry somewhat between soakings. Avoid constant sogginess, which oleander dislikes despite its tolerance of occasional wet soils.

Soil & Potting

Oleander adapts to almost any well-drained soil, including poor, sandy, rocky, and alkaline ground. It tolerates coastal salt and reflected heat that would stress other shrubs. For containers, use a free-draining loam-based mix and a sturdy pot; drainage matters far more than richness. Overly fertile soil encourages soft growth at the expense of flowers.

Humidity & Temperature

Oleander loves heat and thrives in hot, dry Mediterranean-type climates. It is not reliably cold-hardy; in frost-prone areas grow it in a container and move it to a cool, bright, frost-free space for winter. Established plants may tolerate a light frost, dying back but often resprouting from the base. Humidity is not a concern.

Feeding

Oleander needs little feeding. A single application of a balanced or bloom-oriented fertilizer in spring is generally sufficient for landscape plants. Container specimens benefit from light monthly feeding through the growing season. Avoid excess nitrogen, which drives leafy growth and reduces flowering.

Propagation

Oleander roots very easily from softwood or semi-hardwood cuttings taken in summer. Cuttings will even root in a glass of water. It can also be grown from seed, though seedlings may not resemble the parent. Always wear gloves and wash up after handling and pruning, as the sap can irritate skin.

Repotting / Pruning

Prune in late winter or early spring, or immediately after flowering, to control size and shape and encourage bushy, floriferous growth. Oleander flowers on new wood, so hard renewal pruning is well tolerated. Cutting a portion of old stems to the ground each year keeps large plants rejuvenated. Repot container plants every couple of years into fresh mix, wearing gloves throughout.

Common Problems & Pests

The most conspicuous pest is the bright yellow-orange oleander aphid, which clusters on new growth and buds; blast them off with water or treat with insecticidal soap. Scale and mealybugs can also appear. In some regions oleander leaf scorch, a bacterial disease spread by insects, causes marginal browning and dieback and has no cure. Sooty mold may follow heavy aphid infestations. Leggy, non-flowering plants usually need more sun and harder pruning.

Seasonal Care Tips

In spring, prune for shape, feed once, and resume normal watering as growth restarts. Summer is the long flowering season; enjoy the blooms and provide occasional deep water only in extreme drought. In autumn, reduce watering and, in cold climates, move containers under cover before frost. Overwinter frost-tender plants in a cool, bright, frost-free spot, keeping the soil barely moist until spring.