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How to Grow Hibiscus Double Red

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Hibiscus Double Red

Hibiscus rosa-sinensis 'Double Red'

shrub

Hibiscus Double Red is a tropical flowering shrub prized for its large, double-petaled crimson flowers that bloom prolifically throughout warm seasons. This cultivar produces densely ruffled, deep red blooms that can reach 4-6 inches in diameter, creating a stunning ornamental display. It grows as an evergreen shrub in tropical and subtropical climates, reaching 6-10 feet tall.

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Example Hibiscus Double Red timeline · Pittsburgh, PA (Zone 6b)

  1. Plant Hibiscus Double Red

    Around Apr 17

    Near Pittsburgh's average last spring frost.

  2. Tend & protect

    Late spring–summer

    Watering, feeding, and pest-watch reminders.

  3. Harvest Hibiscus Double Red

    Late summer into fall

    Before the first fall frost (≈ Nov 8)

Sample dates for Pittsburgh, PA. Sign up to get exact Hibiscus Double Red dates for your own zip code.

Growing Conditions

☀️
Sun: Full sun, 6-8 hours daily for optimal flowering; tolerates partial shade but blooms decrease
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Water: Keep soil consistently moist but not waterlogged; water deeply 2-3 times per week during growing season. Reduce watering in winter. In containers, water when top inch of soil is dry.
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Spacing: 48 inches
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Days to maturity: Blooms within 3-4 months of planting; reaches mature size in 2-3 years
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Planting depth: Plant at same depth as root ball; space 4 feet apart for landscape planting

Soil

Type: Well-draining, fertile loamy soil
pH: 6.0-6.5
Amendments:
Compost Peat moss or coco coir Perlite or sand for drainage Balanced fertilizer high in phosphorus

Growing Zones

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Thrives in zones 10-11; can be grown in containers indoors in cooler climates

10a 10b 11a 11b

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Growth Stages

1

Establishment

3-4 weeks

Young transplant developing root system and producing initial growth; leaves may be somewhat sparse

Water regularly to establish roots; avoid heavy fertilizing first 2-3 weeks; provide shelter from strong winds

2

Vegetative Growth

2-3 months

Vigorous leaf and branch development; plant becomes bushier with increasing foliage coverage

Prune to encourage branching; apply balanced fertilizer every 2-3 weeks; ensure consistent moisture and full sun exposure

3

Pre-Flowering

2-4 weeks

Plant reaches blooming maturity; flower buds begin to form at branch tips

Switch to phosphorus-rich fertilizer to promote flowering; maintain warm temperatures (70°F+); continue regular watering

4

Flowering

3-6 months (spring through fall in warm climates)

Abundant double red flowers with ruffled petals open continuously; blooms may last 1-2 days each but new flowers replace them daily

Deadhead spent flowers to encourage continuous blooming; maintain consistent watering and feeding schedule; monitor for pests

5

Winter Rest

2-4 months

Flowering slows significantly in cooler months; plant may drop some leaves; growth slows noticeably

Reduce watering frequency; move indoors in zones 9 and below; reduce fertilizing; prune to shape and remove dead wood

Companion Planting

Plan your garden →

Plant with:

Plumbago Bougainvillea Lantana Ixora Mandevilla Vinca Salvia Crotons

Avoid planting near:

Walnut trees (produces juglone) Black cherry (allelopathic)

Common Pests

  • Hand-pick early morning; use neem oil; apply insecticidal soap; encourage natural predators

  • Spray with strong water stream; use neem oil or insecticidal soap; introduce natural predators like ladybugs

  • Increase humidity with regular misting; spray with water; use miticide or neem oil if severe

  • Spray with strong water; use insecticidal soap; apply neem oil; encourage beneficial insects

  • Inspect undersides of leaves; scrape off by hand; apply horticultural oil or neem oil monthly

  • Remove with rubbing alcohol on cotton swabs; spray with neem oil or insecticidal soap weekly

Uses

🍳

Herbal Teas & Beverages

Culinary

Hibiscus flowers, particularly the red varieties, are steeped in water to create tart, ruby-colored teas rich in vitamin C and antioxidants. The flowers impart a tangy, cranberry-like flavor and are used fresh or dried in beverages and cocktails. [source]

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Ornamental Landscaping

Household

The spectacular double red blooms make this hibiscus an excellent choice for tropical gardens, patios, and entryways. Its continuous flowering and vibrant color provide season-long visual impact in warm climates or as a container specimen indoors. [source]

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Traditional Wellness Preparation

Medicinal

Hibiscus flowers contain polyphenols and flavonoids with potential antioxidant and anti-inflammatory properties used in traditional medicine. Hibiscus tea has been traditionally used to support cardiovascular health and general wellness. [source]

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Floral Arrangements & Pressing

Craft

The showy double blooms are prized for fresh flower arrangements, wedding decorations, and floral pressing. The petals also dry well and can be used in potpourri or pressed flower crafts. [source]

🦋

Pollinator Attraction

Wildlife

Hibiscus flowers attract hummingbirds, butterflies, and bees, making them valuable for supporting pollinator populations in tropical and subtropical gardens. [source]

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

Harvest Tips

Hibiscus flowers are ornamental and harvested for display or culinary use. Cut flower stems with at least 2-3 leaves attached in early morning when buds are just opening. Place immediately in water. Blooms last 1-2 days as cut flowers. Petals can be harvested at peak bloom for use in teas or culinary dishes. No deadheading needed for flower production, but removing spent blooms improves appearance.

Fun Facts

  • 🌱 Hibiscus flowers open in the morning and typically close or drop by the evening of the same day, but with continuous blooming, new flowers replace them daily throughout the growing season.
  • 🌱 The double red variety is a cultivar developed through selective breeding to produce flowers with multiple layers of petals, creating a fuller, more ornamental bloom than the single-petaled wild form.
  • 🌱 In Hawaiian culture, hibiscus flowers traditionally indicate relationship status—wearing a flower behind the right ear means the person is available, while behind the left ear indicates they are taken.

Gardening Terms

New to gardening? Learn about terms used in this guide:

Cultivar Deadhead Full Sun Partial Shade pH Transplant
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