How to Grow Royal Blue Plumbago

Royal Blue Plumbago

Plumbago auriculata 'Royal Blue'

shrub

Royal Blue Plumbago is a tropical flowering shrub known for its stunning deep blue flowers that bloom prolifically throughout warm months. It is a cultivar of cape plumbago, prized for its vibrant color, long blooming season, and ability to be trained as a vine or kept as a compact shrub. This heat-loving plant is popular in warm climates and can be grown in containers in cooler regions.

Growing Conditions

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Sun: Full sun, 6-8 hours daily; afternoon shade beneficial in extremely hot climates

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Water: Water regularly during growing season, keeping soil consistently moist but not waterlogged. Reduce watering in winter. Drought-tolerant once established, but blooms more profusely with regular watering.

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Spacing: 36 inches

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Days to maturity: Not applicable (ornamental shrub); flowering begins 60-90 days from transplant

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Planting depth: Plant at same depth as nursery container; transplants should have top of rootball level with soil surface

Soil

Type: Well-draining loamy to sandy soil

pH: 6.0-7.0

Amendments:

Compost or aged manure for organic matter Perlite or coarse sand for drainage Balanced slow-release fertilizer

Growing Zones

Find your zone →

Thrives in zones 9-11; can be grown in containers in zones 7-8 and overwintered indoors

9a 9b 10a 10b 11a 11b

Growth Stages

Establishment

4-6 weeks

Young transplant with limited branching and minimal flowering as plant focuses on root development

Water consistently, protect from strong winds, apply mulch around base. Avoid heavy pruning first season.

Vegetative Growth

2-3 months

Plant develops bushy foliage with increasing branch structure; sparse flowering may begin

Pinch stem tips to encourage branching and bushier form. Remove any dead wood. Apply balanced fertilizer monthly.

Heavy Flowering

4-6 months (spring through fall)

Abundant deep blue flower clusters (cymes) cover the plant from late spring through fall in warm climates

Deadhead spent flowers to encourage continuous blooming. Maintain regular watering and weekly fertilizing. Watch for pests.

Fall Transition

1-2 months

Flowering gradually slows as days shorten and temperatures cool; foliage may show stress in colder zones

Reduce fertilizer frequency. Begin reducing water in zones with winters. Prepare for dormancy or indoor care.

Winter Dormancy

3-4 months

Plant stops growing and flowering; enters dormant period in zones below 10 or may continue slow growth in mild areas

Minimal watering; no fertilizer. In zones 7-8, move containers indoors to bright location. Prune in late winter before growth resumes.

Companion Planting

Plan your garden →

Plant with:

Lantana Esperanza (Tecoma stans) Mandevilla Bougainvillea Salvia Zinnias Alyssum Verbena

Avoid planting near:

Sensitive shade-loving plants that require filtered light Plants preferring consistently wet soil

Common Pests

Spray with insecticidal soap or neem oil, repeat every 7-10 days. Encourage natural predators like ladybugs.
Increase humidity by misting foliage; spray with horticultural oil or miticide. Improve air circulation.
Remove with cotton swab dipped in rubbing alcohol. Apply neem oil weekly until controlled.
Scrape off manually or treat with horticultural oil spray. Apply every 7-14 days as needed.
Spray with water to dislodge; use insecticidal soap or neem oil for heavy infestations.

Uses

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Ornamental Landscaping & Cut Flowers

Household

Royal Blue Plumbago is prized as a landscape accent plant and can be trained as a vine, shrub, or small tree. The striking deep blue flowers are also beautiful in fresh floral arrangements. [source]

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Pollinator Attraction

Wildlife

The flowers attract butterflies, hummingbirds, and bees throughout the growing season, making it an excellent choice for wildlife gardens. [source]

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Traditional Medicinal Uses

Medicinal

In traditional medicine systems, plumbago species have been used to treat various ailments, though scientific evidence is limited. The plant contains compounds that have been studied for potential therapeutic properties. [source]

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Container Gardening & Tropical Appeal

Household

Easily grown in large containers (minimum 15-20 gallons), Royal Blue Plumbago brings tropical beauty to patios, decks, and can be overwintered indoors in cooler climates. [source]

This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.

Harvest Tips

Not harvested for food. Flowers can be cut for fresh arrangements; cut in morning when blooms are fully open. Stems last 5-7 days in water. For propagation, take 4-6 inch semi-hardwood cuttings in spring or summer, root in moist soil or water.

Fun Facts

🌱 The name 'Plumbago' comes from the Latin word for lead (plumbum) because the plant was historically believed to cure lead poisoning.
🌱 Royal Blue Plumbago can be trained to grow as a climbing vine reaching 10-15 feet, or pruned to maintain a compact shrub form just 3-4 feet tall.
🌱 The flowers are pollinated by long-tongued bees and butterflies, and the plant produces a sticky sap that can stain clothing and skin temporarily.

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