How to Grow Canna King Humbert

Canna King Humbert

Canna × generalis 'King Humbert'

flower

Canna King Humbert is a tropical ornamental plant prized for its dramatic bronze-burgundy foliage and vibrant orange-red flowers. This hybrid canna produces tall, banana-like leaves with striking deep coloring and showy flower spikes that bloom throughout summer and fall. It serves as an excellent focal point in tropical-style gardens and adds bold texture and color to landscapes.

Growing Conditions

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Sun: Full sun, 6-8 hours daily for best foliage color and prolific flowering

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Water: Keep consistently moist during growing season; water deeply and regularly. Reduce watering in winter dormancy. Tolerates wet conditions and is excellent for rain gardens or near water features.

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Spacing: 18 inches

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Days to maturity: 60-90 days from planting to first flowers

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Planting depth: Plant rhizomes 4-6 inches deep

Soil

Type: Rich, moist, well-draining soil with high organic matter content

pH: 6.0-7.5

Amendments:

Compost peat moss aged manure organic mulch

Growing Zones

Find your zone →

Thrives in zones 7-11; can be grown in zone 6b with winter protection

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

Growth Stages

Dormancy/Planting

2-4 weeks

Dormant rhizomes stored or planted in spring; minimal above-ground growth visible initially.

Plant rhizomes after last frost when soil is warm (65°F+). Choose location with full sun. Keep soil moist but not waterlogged until shoots emerge.

Emergence & Growth

4-6 weeks

Shoots emerge and unfurl into distinctive large, paddle-shaped leaves with deep bronze-burgundy coloring.

Once shoots appear, maintain consistent moisture. Apply 2-3 inches of mulch around plants. Begin monthly feeding with balanced fertilizer. Remove any dead or damaged leaves.

Vegetative Expansion

6-8 weeks

Plant develops multiple stems with increasingly large foliage; dense clumps form with dramatic dark purple-bronze leaves.

Continue regular watering and fertilizing every 4-6 weeks with a balanced or flowering fertilizer. Maintain weed-free zone. Stake taller stems if in windy locations. Monitor for pests.

Flowering

8-12 weeks (continuous through fall)

Tall flower spikes with vibrant orange-red blooms emerge above foliage; flowers appear in clusters and continue blooming for months.

Deadhead spent flower clusters to encourage continued blooming. Increase phosphorus with flowering fertilizer. Maintain consistent moisture. The burgundy foliage contrasts beautifully with orange flowers.

Dormancy & Overwintering

3-4 months (November-March in northern zones)

Growth slows as temperatures drop; foliage yellows and dies back in fall/winter.

In zones 6-8, cut foliage back to soil level after frost. Dig rhizomes carefully, dry them for a few days, and store in cool (50-60°F), dry location in peat moss or sand through winter. In zones 9-11, may remain in ground with light mulch. Prepare for spring replanting.

Companion Planting

Plan your garden →

Plant with:

Elephant Ear Colocasia Alocasia Salvia Lantana Zinnias Dahlias Ornamental grasses Begonias Hibiscus

Avoid planting near:

Shallow-rooted plants competing for moisture Dense shade-casting trees Plants preferring dry conditions (xeric plants)

Common Pests

Hand-pick in early morning; use pheromone traps; apply neem oil or insecticidal soap; encourage beneficial insects
Increase humidity with regular misting; spray with water; use neem oil or insecticidal soap if severe
Pick off rolled leaves; remove infected foliage; maintain good air circulation; apply spinosad if infestation is heavy
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Hand-pick at night; use copper barriers; apply food-grade diatomaceous earth; beer traps; encourage natural predators
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Spray foliage with water to dislodge; neem oil applications; sulfur dust; ensure adequate spacing for air circulation

Uses

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Edible Rhizomes (Canna Root)

Culinary

Canna rhizomes contain starch-rich tubers that can be cooked and eaten, similar to potatoes. In some tropical regions, cannas are cultivated as a food crop and the roots are boiled or roasted. [source]

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Tropical Garden Focal Point

Ornamental

King Humbert's bold bronze-burgundy foliage and brilliant orange-red flowers make it an stunning centerpiece in tropical, subtropical, and container gardens. It adds dramatic vertical interest and vibrant color from summer through fall. [source]

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Pollinator Attraction

Wildlife

The bright orange-red flowers attract hummingbirds, butterflies, and other pollinators throughout the growing season, making it an excellent choice for wildlife gardens. [source]

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Traditional Medicine Uses

Medicinal

In tropical and subtropical traditional medicine, canna leaves and rhizomes have been used to treat wounds, inflammation, and certain ailments, though scientific validation is limited. [source]

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Cut Flower Arrangements

Household

The tall spikes of orange-red flowers are striking in fresh floral arrangements and tropical-themed bouquets, providing long-lasting color and height. [source]

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

Harvest Tips

Cannas are grown primarily for ornamental display rather than harvest. Cut flowers can be harvested by cutting spikes at the base when the first flowers on the spike open. Flowers last 7-10 days in a vase. For rhizome division and propagation, dig rhizomes in fall after foliage dies back, divide into sections with at least one 'eye' (growth bud), and store for winter.

Fun Facts

🌱 King Humbert was developed in the early 1900s and named after the Italian King Umberto I, making it one of the classic canna cultivars still widely grown today.
🌱 Canna plants are sometimes called 'Indian Shot' because their hard, black seeds were historically used as shot in toy guns.
🌱 The bronze-burgundy foliage of King Humbert intensifies in color with more sunlight exposure; plants in partial shade will have less dramatic coloring.

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