How to Grow Scarlet Oleander
Wikimedia Commons
Scarlet Oleander
Nerium oleander var. rubrum
shrubScarlet oleander is a flowering evergreen shrub prized for its vibrant red blooms and glossy, leathery foliage. Known for its resilience and drought tolerance, it thrives in warm climates and makes an excellent ornamental for hedges, screens, and specimen plantings. The plant produces clusters of fragrant flowers throughout the warm growing season.
Looking for a specific variety?
When should you plant Scarlet Oleander in your zone?
Get a personalized planting timeline — when to start seeds, transplant, and harvest — based on your USDA zone and local frost dates. Free to start.
Example Scarlet Oleander timeline · Pittsburgh, PA (Zone 6b)
-
Plant Scarlet Oleander
Around Apr 17Near Pittsburgh's average last spring frost.
-
Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
-
Harvest Scarlet Oleander
Late summer into fallBefore the first fall frost (≈ Nov 8)
Sample dates for Pittsburgh, PA. Sign up to get exact Scarlet Oleander dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 8b-11, with best performance in zones 9-11
Sign up free to see if Scarlet Oleander grows in your zone — and get a personalized planting timeline.
Get my Scarlet Oleander timeline →Growth Stages
Establishment
4-6 weeksNewly planted shrub with minimal new growth as root system develops
Water regularly for first 4-6 weeks to establish roots. Mulch around base, keeping 6 inches away from stem. Avoid fertilizing until second season.
Vegetative Growth
Spring through early summer (3-4 months)Rapid leaf and stem development; plant develops its characteristic shape and glossy foliage
Prune lightly to shape. Fertilize monthly during growing season with balanced fertilizer. Maintain consistent watering during dry spells.
Flowering
Late spring through fall (4-6 months, can be longer in warm climates)Abundant clusters of tubular scarlet flowers appear at branch tips; blooms continue through warm season
Deadhead spent flowers to encourage continuous blooming. Reduce nitrogen fertilizer to promote more flowers. Maintain moderate water.
Seed Pod Development
Summer into fall (ongoing during bloom season)After flowers fade, long slender seed pods form; foliage may reduce slightly
Deadhead regularly to prevent energy loss to seeds. Cut back on watering slightly as days shorten.
Winter Dormancy
November through February (varies by zone)Growth slows significantly; in colder zones some leaf drop may occur; plant enters semi-dormant state
Reduce watering substantially. No fertilizing needed. Protect from frost in zone 8b. Prune any frost-damaged wood in early spring.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
-
Spray with neem oil or insecticidal soap; encourage natural predators like ladybugs; use strong water spray to dislodge
-
Prune heavily infested branches; apply horticultural oil in winter when plant is dormant
-
Use yellow sticky traps; spray with neem oil or insecticidal soap; introduce parasitic wasps
-
Increase humidity with regular misting; spray with water to wash off; use miticide if severe
-
Hand-pick caterpillars; use Bacillus thuringiensis (Bt) spray; remove affected foliage
Uses
WARNING: Toxic Plant
CulinaryScarlet oleander is EXTREMELY TOXIC and should NEVER be consumed. All parts contain cardiac glycosides (oleandrin) that can cause severe poisoning or death. It is unsuitable for any culinary use. [source]
Ornamental Cut Flowers
HouseholdThe vibrant scarlet flower clusters are excellent for fresh floral arrangements and bouquets, lasting 7-14 days in water. Handle only with gloves due to toxicity. [source]
Privacy Hedge and Screening
HouseholdThe dense evergreen foliage and attractive blooms make scarlet oleander ideal for creating living hedges, privacy screens, and windbreaks in warm climates. Responds well to pruning and shaping. [source]
Pollinator Attraction
WildlifeThe abundant fragrant flowers attract butterflies, hummingbirds, and bees throughout the blooming season, making it valuable for pollinator gardens despite the plant's toxicity. [source]
Traditional Medicine (Historical Interest Only)
MedicinalHistorically used in traditional medicine systems; contains cardiac glycosides with potential therapeutic compounds. Modern medical use is limited due to toxicity, and consumption is dangerous without professional pharmaceutical extraction. [source]
This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.
Harvest Tips
Oleander is grown ornamentally for cut flowers and foliage. Harvest flower clusters in early morning when they're fully opened. Cut stems at a 45-degree angle above a leaf node. Wear gloves when handling as all parts are toxic. Flowers last 1-2 weeks in a vase with clean water. Do not ingest any part of the plant.
Fun Facts
- 🌱 Scarlet oleander is one of the most poisonous ornamental plants in cultivation—all parts are toxic, including the smoke from burning branches. Even handling the plant requires gloves, and accidental ingestion can cause serious cardiac complications.
- 🌱 The plant has been cultivated for over 2,000 years, with origins tracing to the Mediterranean and Asia. Ancient Romans associated it with abundance and beauty.
- 🌱 Oleander is remarkably tolerant of poor growing conditions, including air pollution, salt spray, and extreme heat, making it an excellent choice for urban gardens and coastal regions.
Join 30,000 gardeners planning their gardens with LizPlants.
Get your personalized Scarlet Oleander planting timeline
Tell us your zip code and we'll calculate exactly when to start Scarlet Oleander seeds, transplant seedlings, and harvest — based on your USDA zone and local frost dates. Includes calendar reminders and printable task lists. Free to start.
Get my Scarlet Oleander timeline →