How to Grow Crocosmia

Crocosmia

Crocosmia × crocosmiiflora

flower

Crocosmia is a tender perennial bulb from South Africa known for its vibrant, star-shaped flowers in shades of red, orange, and yellow that bloom in mid to late summer. The plants produce graceful, arching sprays of flowers atop sword-like green foliage, creating striking vertical accents in gardens. They are popular in cottage gardens and cut flower arrangements.

Looking for a specific variety?

Lucifer Emily McKenzie Citronella Solfatare George Davison Fireking

Growing Conditions

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Sun: Full sun to partial shade; 6-8 hours of direct sunlight daily for best flowering

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Water: Moderate watering during growing season; keep soil consistently moist but not waterlogged. Reduce watering after flowering. In winter dormancy, water sparingly.

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Spacing: 6 inches

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Days to maturity: 90-120 days from planting to first flowers

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Planting depth: Plant corms 2-3 inches deep, pointed end up

Soil

Type: Well-draining loamy soil with organic matter

pH: 6.0-7.0

Amendments:

Compost Peat moss or coconut coir Perlite or sand for drainage Balanced slow-release fertilizer

Growing Zones

Find your zone →

Thrives in zones 6-11; in colder zones (5 and below), dig and store corms over winter or grow as annuals

6a 6b 7a 7b 8a 8b 9a 9b 10a 10b 11a

Growth Stages

Dormancy/Planting

Variable; begins when planted

Corms are dormant. Plant in spring after last frost or in fall in warm climates. Corms are small, hard, bulb-like structures.

Store corms in cool, dry place before planting. Ensure soil is well-draining to prevent rot. Plant in spring in cool zones, fall in warm zones.

Emergence & Vegetative Growth

4-6 weeks

Sword-like green foliage emerges and grows upright. Plants develop a dense clump of leaves 2-3 feet tall.

Water regularly as growth begins. Apply balanced fertilizer monthly. Mulch around base to retain moisture and suppress weeds.

Bud Formation

2-3 weeks

Flower spikes develop at leaf bases and rise above foliage. Small buds form along the arching stems in tight clusters.

Continue consistent watering and feeding. Stake tall varieties if needed. Remove any dead leaves to improve air circulation.

Flowering

6-8 weeks

Star-shaped flowers open sequentially along the arching spikes, creating dramatic cascades of color. Flowers typically red, orange, or yellow.

Deadhead spent flowers to encourage continued blooming. Water at soil level to keep flowers dry. Fertilize every 2 weeks with bloom-booster formula.

Senescence & Dormancy

6-8 weeks until full dormancy

Flowering slows in late fall. Foliage begins to yellow and die back. Plant enters dormancy over winter.

In zones 6-7, dig corms in fall after foliage dies back, dry, and store indoors over winter in cool, frost-free location. In zones 8+, can leave in ground with mulch protection.

Companion Planting

Plan your garden →

Plant with:

Daylilies Rudbeckia Sedum Salvia Ornamental grasses Coreopsis Black-eyed Susan Lavender

Avoid planting near:

Plants preferring dry conditions Shade-loving plants in deep shade Shallow-rooted annuals that compete for water

Common Pests

Spray foliage with water to dislodge; use insecticidal soap or neem oil if severe
Spray with strong water stream; apply insecticidal soap or neem oil
and
Hand-pick; create barriers with copper tape; use slug bait or diatomaceous earth
Remove affected flowers; spray with insecticidal soap; improve air circulation
Plant in well-draining soil; avoid overwatering; store corms in dry place; discard rotted corms

Uses

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Ornamental edible flowers

Culinary

Crocosmia flowers are non-toxic and can be used to garnish desserts and salads for a striking visual presentation. The flowers have a subtle flavor and are primarily used for their dramatic appearance. [source]

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Cut flowers and floral arrangements

Household

Crocosmia is highly valued as a cut flower for its long-lasting blooms, graceful arching form, and vibrant colors. Used extensively in wedding bouquets, summer arrangements, and dried flower crafts. [source]

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Pollinator attraction

Wildlife

The nectar-rich flowers attract hummingbirds, bees, and butterflies to the garden, supporting pollinator populations and contributing to ecosystem health. [source]

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Dried flower arrangements

Craft

Crocosmia flowers and seed heads dry beautifully and can be used in permanent arrangements, wreaths, and craft projects. Harvest when flowers are fully open and dry in a cool, airy space. [source]

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Garden focal points and borders

Household

The tall, arching growth habit and bold flower color make crocosmia excellent for creating vertical interest, defining garden edges, and serving as specimen plants in mixed borders. [source]

Harvest Tips

Cut flowers for arrangements when the first few buds on a spike have opened. Cut in the morning for longest vase life (7-10 days in cool water). Leave at least 2-3 leaves on plants to support next season's growth. Allow foliage to fully die back naturally before digging corms in fall for storage.

Fun Facts

🌱 The name 'Crocosmia' comes from Greek words 'crocus' (saffron) and 'osme' (smell), though the flowers are actually not fragrant—the name refers to the colorful, saffron-like appearance.
🌱 Crocosmia corms multiply underground, spreading to form larger colonies over time; a single corm can produce 5-10 new corms in one growing season.
🌱 The plant is native to South Africa and has naturalized in parts of the UK, where it thrives so well in mild climates that it's sometimes considered invasive in certain regions.

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