How to Grow Hawaiian Plumbago
Hawaiian Plumbago
Plumbago auriculata subsp. auriculata
shrubHawaiian plumbago is a tropical to subtropical flowering shrub known for its striking sky-blue flowers that bloom prolifically in warm seasons. It's a vigorous grower that can reach 6-10 feet tall and wide, making it excellent for hedges, screens, or specimen plantings. The plant produces small, clustered flowers and narrow green leaves on semi-woody stems.
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Example Hawaiian Plumbago timeline · Pittsburgh, PA (Zone 6b)
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Plant Hawaiian Plumbago
Around Apr 17Near Pittsburgh's average last spring frost.
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Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
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Harvest Hawaiian Plumbago
Around Aug 15≈ 120 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Hawaiian Plumbago dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Zones 9b-12; can be grown in containers in cooler regions and brought indoors
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Get my Hawaiian Plumbago timeline →Growth Stages
Establishment
4-6 weeksYoung transplant with limited branching and minimal flowering
Water regularly to help roots establish. Stake if needed for support. Avoid fertilizing heavily at first to prevent excessive tender growth.
Vegetative Growth
6-12 weeksRapid stem and leaf development with increasingly bushy form; minimal flowers
Prune to shape and encourage branching. Apply balanced fertilizer monthly. Continue consistent watering.
Flowering Initiation
3-4 weeksFirst flower buds appear at stem tips; some scattered flowers develop
Switch to higher-phosphorus fertilizer to promote blooming. Maintain consistent moisture and full sun exposure.
Peak Bloom
3-6 months (spring through fall in warm climates)Abundant clusters of sky-blue flowers covering much of the foliage; long flowering period
Deadhead spent flower clusters to encourage continuous blooming. Maintain watering and fertilize every 2-3 weeks with bloom-promoting formula.
Dormancy/Decline
2-4 monthsReduced flowering and growth as temperatures cool; foliage may thin slightly
Reduce watering and cease fertilizing. In cooler zones, protect from frost or bring container plants indoors. Prune in late winter to rejuvenate.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Spray with insecticidal soap or neem oil; strong water spray to dislodge; reflective mulches
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Increase humidity; spray with water; use miticide or neem oil if severe
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Remove with cotton swab dipped in rubbing alcohol; spray with insecticidal soap or neem oil
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Prune heavily infested branches; treat with horticultural oil or insecticidal soap in dormant season
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Hand-pick if feasible; apply Bacillus thuringiensis (Bt) for biological control
Uses
Ornamental Landscaping
HouseholdHawaiian plumbago is an outstanding ornamental shrub used for borders, hedges, foundation plantings, and specimen displays. Its prolific blue flowers provide vibrant color to tropical and subtropical gardens. [source]
Cut Flower Arrangements
CraftThe delicate clusters of sky-blue flowers can be cut and used in fresh floral arrangements, adding a tropical aesthetic to indoor displays. Blooms last several days in water. [source]
Pollinator Garden Plant
WildlifeThe abundant flowers attract bees, butterflies, and hummingbirds, making it an excellent choice for pollinator-friendly gardens. Provides nectar-rich blooms throughout the warm season. [source]
Edible Flowers
CulinaryThe individual flowers are edible and can be used as a colorful garnish for desserts, cocktails, and salads, though they are typically grown for ornament rather than culinary use. [source]
Traditional Herbal Use
MedicinalIn tropical regions, various Plumbago species have been used in traditional medicine for skin conditions and inflammation, though modern scientific evidence is limited. [source]
This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.
Harvest Tips
This is an ornamental shrub, not typically harvested. However, flowers can be cut for floral arrangements when fully open. Prune stems in late winter (January-March in warm zones) to remove dead wood, shape the plant, and rejuvenate older growth. Deadheading spent flower clusters encourages continuous blooming throughout the season.
Fun Facts
- 🌱 Hawaiian plumbago produces a natural compound called plumbagin that has antimicrobial and antifungal properties, though this is primarily studied in laboratory settings.
- 🌱 The flower clusters are technically called 'cymes' and can produce dozens of individual blooms from a single cluster, with flowers opening in succession over several weeks.
- 🌱 Despite its name 'Hawaiian plumbago,' this species is actually native to southern Africa, not Hawaii; it became popular in Hawaiian gardens and has naturalized there in warm areas.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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