Plumbago
Plumbago auriculata
Imperial Blue
About this plant
Plumbago auriculata, commonly called plumbago, is a sprawling shrub known for its clusters of sky-blue flowers that bloom from spring to fall. It is often used as a garden hedge, ground cover, or climbing vine with support. The plant is valued for its long flowering period and ability to attract butterflies. It is native to South Africa but widely grown in warm climates worldwide.
Taxonomy
- Genus
- Plumbago
- Family
- Plumbaginaceae
- Higher classification
- Order Caryophyllales
- Plant type
- Shrub
- Lifespan
- Perennial
Origin & Distribution
- Native region
- South Africa
- Distribution
- Native to South Africa; cultivated in warm regions globally including the southern United States, Mediterranean, and Australia.
Care
- Light preference
- Full sun
- Suitable locations
- Outdoor, Balcony, Greenhouse
- Preferred window facing
- South-facing, West-facing, East-facing
- Watering frequency
- Moderate
- Watering interval
- 4–10 days
- Humidity
- Normal
- Minimum
- 5 °C
- Maximum
- 35 °C
- Optimal
- 15–30 °C
- USDA hardiness zones
- 9–11
- Soil pH
- 6.0–7.5 (slightly acidic to neutral)
- Soil type
- well-draining loam or sandy soil
Watering. Water regularly during the growing season but allow soil to dry out between waterings. Reduce watering in winter.
Fertilizing. Feed plumbago with a balanced, slow-release fertilizer in spring and mid-summer to support healthy growth and flowering. Avoid over-fertilizing, which can lead to excessive leaf growth with fewer flowers.
Plumbago auriculata is a tough and fast-growing shrub that thrives in sunny spots. It prefers well-draining soil and can tolerate dry conditions once established. Regular pruning helps keep it neat and encourages more flowers. It is generally low-maintenance and resistant to most pests and diseases.
Propagation
- Propagation methods
- Cuttings, Division
- Care difficulty
- Easy
Ornamental features
- Flowering
- Yes
- Flowering period
- spring–fall
Clusters of bright blue flowers, green oval leaves, sprawling or climbing form.
Toxicity & Safety
- Toxic to humans
- Mildly toxic
- Toxic to pets
- Mildly toxic
- Weed potential
- Low spread
Sap may cause mild skin irritation; keep away from children and pets to avoid ingestion.
Allergy information
- Allergy risk
- Low
- Allergy triggers
- Pollen, Sap or latex, Skin contact
- Pollen level
- Low
Plumbago auriculata may cause mild skin irritation in some people who touch its sap. It produces pollen, but it is not a major cause of airborne allergies. To reduce any risk, wear gloves when pruning and avoid direct contact with the sap.
Common problems
If overwatered, plumbago may develop root rot. Lack of sunlight can reduce flowering. Occasionally, it may attract aphids or whiteflies.
Uses
Ornamental shrub for gardens and landscapes; attracts butterflies and pollinators.
Notes
Prune plumbago after flowering to maintain shape and encourage new blooms. It can be grown in containers but needs regular watering and feeding. Protect from frost in cooler climates.