How to Grow Scarlet Sister Hibiscus
Scarlet Sister Hibiscus
Hibiscus acetosella 'Scarlet Sister'
shrubScarlet Sister Hibiscus is a tropical shrub prized for its deep burgundy foliage and vibrant red flowers that bloom prolifically throughout the growing season. This compact, ornamental hibiscus variety is often grown as an annual in cooler climates or as a year-round shrub in warm regions. Its striking foliage and continuous flowering make it a popular choice for borders, containers, and tropical gardens.
When should you plant Scarlet Sister Hibiscus in your zone?
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Example Scarlet Sister Hibiscus timeline · Pittsburgh, PA (Zone 6b)
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Plant Scarlet Sister Hibiscus
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 Scarlet Sister Hibiscus
Around Jun 16≈ 60 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Scarlet Sister Hibiscus dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives year-round in zones 9b-11; grown as an annual in cooler zones
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Seedling
3-4 weeksYoung plants develop their first true leaves with characteristic burgundy-tinged foliage; stems are soft and tender
Keep soil consistently moist; provide bright, indirect light; maintain warm temperatures (70-80°F); avoid overwatering which causes damping off
Vegetative Growth
4-6 weeksRapid stem and leaf development; foliage deepens to rich burgundy color; plant becomes fuller and bushier
Pinch back growing tips to encourage branching and compact growth; maintain consistent moisture; feed with balanced fertilizer every 2-3 weeks; provide full sun for color development
Bud Formation
2-3 weeksFlower buds appear at branch tips; burgundy sepals are visible before blooming; plant is at peak vegetative vigor
Continue regular watering and feeding; ensure adequate sunlight; remove any damaged or diseased branches; support branches if they become heavy
Flowering
8-12 weeks or longerLarge, showy red flowers open progressively; blooms are 2-3 inches wide with prominent red stamens; flowers persist for 1-2 days each before dropping
Maintain consistent watering as blooming drains plant energy; feed with higher phosphorus fertilizer to support flowering; deadhead spent flowers to encourage continuous blooming; monitor for pests attracted to flowers
Senescence/Winter Dormancy
Variable; 2-4 months in mild climatesIn warm zones, flowering continues year-round; in cooler climates, plants decline as temperatures drop; foliage may yellow and drop
In zones 9-10, reduce watering and feeding as growth slows; protect from frost; in colder zones, treat as annual or bring containerized plants indoors before first frost; prune lightly in late winter
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Spray with water to dislodge; use insecticidal soap; maintain humidity; prune heavily infested leaves
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Use yellow sticky traps; spray with neem oil or insecticidal soap; increase air circulation; remove infested leaves
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Remove with rubbing alcohol on cotton swab; spray with neem oil; use systemic insecticide for severe infestations
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Spray with strong water stream; use insecticidal soap; apply neem oil; encourage natural predators like ladybugs
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Scrape off manually; spray with horticultural oil or insecticidal soap; prune heavily infested branches
Uses
Tropical Garden Accent
OrnamentalThe deep burgundy foliage and scarlet flowers create striking visual interest in borders, beds, and tropical landscapes. Its compact growth habit makes it ideal for mixed plantings and focal points in garden design. [source]
Container Growing & Patio Color
HouseholdScarlet Sister grows beautifully in large pots and containers, making it perfect for patios, balconies, and porches. Container-grown plants can be brought indoors before frost in cooler climates. [source]
Pollinator Attractor
WildlifeThe bright red flowers attract hummingbirds, butterflies, and other pollinators, making it valuable for wildlife gardens and creating dynamic garden movement. [source]
Cut Flower Arrangements
CraftThe colorful blooms and attractive foliage add tropical flair to fresh flower arrangements and floral designs, though individual flowers are short-lived. [source]
Edible Flowers
CulinaryHibiscus acetosella flowers are edible and can be used to garnish drinks, desserts, and salads, adding color and a mild tart flavor. Ensure the plant has not been treated with pesticides before consumption. [source]
Harvest Tips
Scarlet Sister Hibiscus is not harvested for food; instead, enjoy its ornamental value. Deadhead spent flowers regularly to encourage continuous blooming. Cut stems can be used in floral arrangements; harvest in early morning for longest vase life (typically 1-2 days). Prune in late winter to early spring to remove dead wood and shape the plant.
Fun Facts
- 🌱 Scarlet Sister Hibiscus foliage contains burgundy pigments that intensify with full sun exposure, making light a critical factor for its signature deep color.
- 🌱 The flowers are ephemeral, lasting only one day before dropping, but the plant produces new buds continuously from summer through fall, ensuring constant blooms.
- 🌱 Hibiscus acetosella is related to okra and cotton, sharing the family Malvaceae; the seed pods contain edible seeds that were traditionally used in some cuisines.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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