How to Grow Hibiscus, Double Red
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Hibiscus, Double Red
Hibiscus rosa-sinensis 'Double Red'
shrubDouble Red Hibiscus is a tropical flowering shrub renowned for its large, showy double flowers in deep crimson to scarlet red. The blooms feature multiple layers of ruffled petals and prominent stamens, creating an ornamental display from spring through fall. This cultivar is a popular landscape and container plant in warm climates and conservatories.
When should you plant Hibiscus, Double Red in your zone?
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Example Hibiscus, Double Red timeline · Pittsburgh, PA (Zone 6b)
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Plant Hibiscus, Double Red
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 Hibiscus, Double Red
Late summer into fallBefore the first fall frost (≈ Nov 8)
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Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 9b-11; can be grown in cooler zones as a container plant brought indoors during winter
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Get my Hibiscus, Double Red timeline →Growth Stages
Establishment
4-8 weeksYoung plant develops root system and new leafy growth
Water regularly to keep soil moist; provide bright light; avoid fertilizing for first month. Mulch around base to retain moisture.
Vegetative Growth
3-6 monthsPlant produces dense foliage and sturdy branches; leaves are glossy, deep green, and lanceolate
Apply balanced fertilizer monthly (10-10-10 or higher phosphorus). Prune lightly to encourage bushiness. Ensure adequate water and full sun.
Bud Formation
2-4 weeksRed buds appear at branch tips as plant prepares to flower
Increase phosphorus and potassium fertilizer to support blooming; reduce nitrogen slightly. Maintain consistent watering and full sun exposure.
Flowering
3-6 months (spring through fall); sporadic in winterLarge, double red flowers (4-6 inches across) open with ruffled petals; typically peak bloom in warm months
Continue fertilizing every 2-3 weeks with bloom-boosting formula (higher phosphorus). Remove spent flowers to encourage continuous blooming. Maintain regular watering.
Rest/Winter Dormancy
2-3 monthsFlowering slows or stops; plant may drop some leaves in cold conditions
Reduce watering; hold off on fertilizing in coldest months. Move container plants indoors if temperatures drop below 50°F. Minimal pruning needed.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Spray with insecticidal soap or neem oil; encourage natural predators; improve air circulation
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Remove with cotton swab dipped in rubbing alcohol; spray neem oil; isolate infested plants
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Prune affected branches; spray horticultural oil in dormant season; treat with insecticidal soap
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Increase humidity; spray with strong water stream; apply miticide or neem oil if severe
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Spray with water or insecticidal soap; use neem oil; introduce ladybugs
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and
Improve air circulation; remove affected leaves; apply fungicide; avoid overhead watering
Uses
Ornamental Landscaping & Interior Decor
HouseholdDouble Red Hibiscus is prized as a focal point in tropical and subtropical gardens, patio containers, and indoor conservatories. Its large, dramatic red double flowers add visual impact to landscape designs and can brighten indoor spaces when grown in bright, warm conditions. [source]
Cut Flowers & Floral Arrangements
CraftThe large, showy double blooms are popular in fresh flower arrangements and tropical-themed floral designs. They can last 1-2 days in a vase with fresh water and are used in wedding bouquets and special event decorations. [source]
Natural Dye Production
HouseholdHibiscus flowers have traditionally been used to create natural red and pink dyes for textiles and paper crafts. The flower petals can be processed to extract pigments for dyeing projects. [source]
Pollinator & Hummingbird Garden
WildlifeThe nectar-rich double flowers attract hummingbirds, butterflies, and bees, making Double Red Hibiscus an excellent addition to pollinator-friendly gardens. It provides food and ornamental value simultaneously. [source]
Traditional Herbal Medicine
MedicinalHibiscus is used in traditional medicine in many cultures to make teas believed to support heart health and reduce blood pressure. The flowers contain anthocyanins and other compounds studied for potential health benefits. [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 flowering plant, not harvested for food. Remove spent double flowers regularly to encourage continuous blooming throughout the season. Harvest flowers for floral arrangements in early morning when they first open; they remain fresh for 1-2 days in water.
Fun Facts
- 🌱 Double Red Hibiscus flowers are the state flower of Hawaii and represent the Big Island; they are highly symbolic in Hawaiian culture and used in traditional leis.
- 🌱 A single Double Red Hibiscus flower can grow to 6 inches or larger in diameter under optimal conditions, rivaling peony blooms in size and drama.
- 🌱 Hibiscus flowers open in the morning and typically close by evening, with each bloom lasting only one day; however, the plant produces continuous flowers over months of warm weather.
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