How to Grow Kōkio 'ula'ula
Kōkio 'ula'ula
Hibiscus brackenridgei subsp. mokuleianus
shrubKōkio 'ula'ula is a rare, endemic Hawaiian hibiscus species prized for its deep red to crimson flowers. This native Hawaiian shrub is critically endangered in the wild and is now primarily cultivated as an ornamental and conservation specimen. It produces large, showy flowers and is the state flower of Hawaii.
When should you plant Kōkio 'ula'ula in your zone?
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Example Kōkio 'ula'ula timeline · Pittsburgh, PA (Zone 6b)
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Plant Kōkio 'ula'ula
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 Kōkio 'ula'ula
Around Oct 14≈ 180 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Kōkio 'ula'ula dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 10b-12, best in warm tropical to subtropical climates
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Get my Kōkio 'ula'ula timeline →Growth Stages
Seedling
4-6 weeksSmall plant with 2-4 true leaves, tender growth
Keep soil consistently moist but not waterlogged. Provide bright, indirect light. Protect from direct sun and wind.
Vegetative Growth
6-12 monthsPlant develops branching structure with green foliage, no flowers present
Gradually acclimate to full sun. Begin light fertilizing with balanced formula every 2-3 weeks. Pinch tips to encourage bushiness.
Flowering
Spring through fall (can be year-round in ideal conditions)Large, trumpet-shaped flowers appear in deep red to crimson color, typically 5-6 inches across
Switch to bloom-promoting fertilizer (higher phosphorus). Maintain consistent watering. Remove spent flowers to encourage continuous blooming.
Seed Development
4-8 weeks per flowerFlowers fade and seed pods form if flowers are not deadheaded
If collecting seeds, allow pods to mature and dry on plant. Otherwise, continue deadheading to maintain flowering.
Dormancy
2-3 months (winter)Reduced growth in cooler winter months; may drop some leaves
Reduce watering and fertilizing. Provide protection from temperatures below 50°F. Prune if needed to shape plant.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Remove affected leaves; spray with insecticidal soap or neem oil; encourage natural predators
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Strong spray of water; insecticidal soap; neem oil; reflective mulches
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Increase humidity; spray with water; neem oil or miticide if severe
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Horticultural oil spray; prune heavily infested branches; insecticidal soap
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Remove with alcohol-soaked cotton swab; spray with insecticidal soap or neem oil
Uses
Cut flowers & lei making
HouseholdThe striking red flowers are traditionally used in Hawaiian lei-making and make exceptional cut flowers for arrangements. The blooms' vivid color and large size make them a premium choice for floral displays. [source]
Pollinator nectar source
WildlifeThe abundant, nectar-rich flowers attract native Hawaiian birds and pollinating insects, making it valuable for supporting island ecosystems. Particularly important as a food source for endangered Hawaiian honeycreepers. [source]
Ornamental landscaping
CraftPrized as a specimen plant and focal point in tropical gardens and botanical collections, especially valuable for native Hawaiian habitat restoration. Its stunning blooms and cultural significance make it a garden centerpiece. [source]
Traditional Hawaiian uses
MedicinalHistorically used in Hawaiian traditional medicine (lāʻau lāpaʻau) for various remedies. Modern research is exploring potential health applications of Hibiscus species compounds. [source]
Conservation significance
WildlifeAs an endangered endemic species, cultivating this plant contributes to species preservation and genetic diversity. Specimens in botanical gardens and private collections serve as insurance against extinction. [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 species not typically harvested. Cut flowers can be harvested in early morning when fully open by snipping the stem cleanly. Flowers last 1-2 days. For seed collection, allow seed pods to dry and brown on the plant, then collect and dry further in a warm, dry location.
Fun Facts
- 🌱 Kōkio 'ula'ula is Hawaii's state flower and has been recognized as critically endangered in its native habitat, making conservation cultivation efforts vital for the species' survival.
- 🌱 The name 'ula'ula means 'red red' in Hawaiian, referring to the deep crimson color of the flowers that can measure up to 6 inches across.
- 🌱 Hibiscus flowers typically last only one day but bloom prolifically throughout warm seasons, allowing the plant to produce hundreds of flowers over its blooming period.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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