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How to Grow Red Starfish

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Red Starfish

Oxalis versicolor

flower

Red Starfish is a striking tender perennial bulb from South Africa known for its distinctive red star-shaped flowers with contrasting white centers and reverses. The blooms open in sunlight and close at night or in cloudy weather. It produces attractive clover-like foliage and grows 6-12 inches tall.

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

  1. Plant Red Starfish

    Around Apr 17

    Near Pittsburgh's average last spring frost.

  2. Tend & protect

    Late spring–summer

    Watering, feeding, and pest-watch reminders.

  3. First Red Starfish blooms

    Around Jun 16

    ≈ 60 days after planting

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

Growing Conditions

☀️
Sun: Full sun, 6-8 hours daily for best flower production
💧
Water: Water moderately during growing season; keep soil moist but never waterlogged. Reduce watering in winter dormancy. Drought-tolerant once established.
📏
Spacing: 4 inches
📅
Days to maturity: 60-90 days from bulb to first flowers
🌱
Planting depth: 1-1.5 inches deep, pointed end up

Soil

Type: Well-draining sandy or gritty loam
pH: 6.0-7.0
Amendments:
Perlite or coarse sand Compost Avoid heavy clay soils

Growing Zones

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Thrives in zones 9b-11; grown as a tender annual or container plant in cooler zones

9b 10a 10b 11a 11b

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Growth Stages

1

Dormancy/Planting

2-4 weeks

Bulbs are dormant and appear as small papery bulbs ready for planting

Plant in fall in warm climates or spring in cooler regions. Keep soil dry until sprouting begins

2

Sprouting & Establishment

3-4 weeks

First leaves emerge and small clover-like foliage develops

Begin watering moderately once growth starts. Provide bright light. Fertilize lightly with balanced fertilizer

3

Vegetative Growth

4-6 weeks

Plant develops bushy foliage with multiple leaf stems reaching 4-8 inches tall

Maintain consistent moisture without waterlogging. Deadhead any early flower buds to encourage foliage. Continue light feeding

4

Flowering

8-12 weeks (spring through early summer)

Distinctive red star-shaped flowers with white centers bloom abundantly on thin stems above foliage

Provide full sun for maximum bloom opening. Water regularly but avoid wetting flowers. Deadhead spent blooms to extend flowering

5

Decline & Dormancy

6-8 weeks (summer through early fall)

Foliage yellows and flowers diminish as plant enters summer rest period

Gradually reduce watering. Stop fertilizing. In containers, store bulbs in cool, dry place over summer or allow to dry down naturally

Companion Planting

Plan your garden →

Plant with:

Echeveria Aloe Gazania Delosperma Lithops Desert marigold

Avoid planting near:

Moisture-loving plants Plants requiring heavy watering Shade-loving perennials

Common Pests

  • Increase humidity with occasional misting, spray with water, or use insecticidal soap if severe

  • Remove with rubbing alcohol on a cotton swab or apply neem oil

  • Scrape off by hand or treat with horticultural oil

  • Prevent through well-draining soil and avoiding overwatering; remove affected bulbs

Uses

🍳

Edible flowers

Culinary

The flowers are technically edible and can be used as a delicate garnish for salads or desserts, though they are primarily grown for ornamental value. [source]

🏠

Cut flower arrangement

Household

The striking red and white star-shaped flowers are excellent for fresh floral arrangements and bring a unique accent to bouquets and table displays. [source]

🎨

Ornamental container gardens

Craft

Red Starfish bulbs are ideal for container planting on patios, windowsills, and indoor displays, and can be easily brought indoors in winter in cold climates. [source]

🦋

Pollinator attraction

Wildlife

The open star-shaped flowers attract bees and other pollinators, making it a beneficial addition to xeriscape and butterfly gardens. [source]

Harvest Tips

Red Starfish is an ornamental flower; cut blooms in early morning when fully open for fresh arrangements. Flowers last 1-2 days in a vase. Collect bulbs in fall for winter storage if growing in containers in cool climates.

Fun Facts

  • 🌱 Red Starfish flowers display nyctinasty—they open in sunlight and close at night or in overcast weather, reacting to light changes throughout the day
  • 🌱 The plant is native to South Africa and is named for its distinctive five-pointed star shape, resembling a starfish
  • 🌱 Oxalis bulbs are protected by a papery tunic that resembles onion skin, helping them survive dormancy and drought conditions

Gardening Terms

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

Deadhead Full Sun Perennial
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