How to Grow Yellow King Humbert
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Yellow King Humbert
Canna × generalis 'Yellow King Humbert'
flowerYellow King Humbert is a tropical canna lily cultivar prized for its large, vibrant yellow flowers with red spotting and dramatic bronze-green foliage. It grows 4-6 feet tall and blooms prolifically throughout summer and fall, making it an excellent choice for borders, containers, and tropical-themed gardens. This vigorous cultivar is a cross between Canna edulis and Canna indica and remains one of the most popular canna varieties for ornamental use.
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Example Yellow King Humbert timeline · Pittsburgh, PA (Zone 6b)
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Plant Yellow King Humbert
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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First Yellow King Humbert blooms
Around Jun 16≈ 60 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Yellow King Humbert dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 7-11; can be grown as annuals or overwintered in cooler zones
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Rhizome Dormancy
2-3 months (winter)Rhizomes are stored dormant and may appear dried out with visible growth nodes or buds
Store in cool, dry place over winter; inspect for rot and discard damaged rhizomes; begin watering when planting in spring
Sprouting & Vegetative Growth
4-6 weeksShoots emerge from rhizomes and develop into tall stems with large, lance-shaped foliage; bronze-green leaves unfurl
Plant outdoors after last frost date; ensure consistent moisture and warmth; feed with balanced fertilizer monthly; mulch around base
Bud Formation
2-3 weeksDense flower buds appear at stem tips, initially enclosed in bracts; buds swell and prepare to open
Switch to higher phosphorus fertilizer to encourage blooming; maintain consistent moisture and full sun; remove any damaged foliage
Flowering
3-4 months (summer through fall)Large, ruffled yellow flowers with red spots open sequentially along flower spikes; flowers may reach 2-3 inches across
Deadhead spent flower clusters to encourage continuous blooming; maintain regular watering and feeding every 2-3 weeks; watch for pests
Frost & Dormancy
Until springFoliage blackens after first frost; plant dies back to rhizome level in temperate zones
Cut foliage to ground level after frost; dig rhizomes, clean, and store in cool, frost-free location for winter; or mulch heavily if leaving in ground in zone 7-8
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Hand-pick early morning; use insecticidal soap or neem oil; apply pheromone traps nearby
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Increase humidity through misting; spray with water to dislodge; use miticide or insecticidal soap if severe
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Remove rolled leaves; use Bacillus thuringiensis (BT) for caterpillar control
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Prune heavily infested stems; use horticultural oil or insecticidal soap
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and
Remove by hand; use copper barriers or diatomaceous earth; beer traps
Uses
Edible Canna Roots
CulinaryCanna rhizomes contain starch and can be cooked and eaten like potatoes, though ornamental varieties are primarily grown for flowers. In tropical regions, cannas are cultivated for both ornamental and nutritional purposes. [source]
Cut Flowers & Arrangements
HouseholdYellow King Humbert's large, exotic flowers are excellent for tropical-themed floral arrangements and last well in water. The bold color and spotted pattern add dramatic visual impact to bouquets. [source]
Hummingbird & Pollinator Attraction
WildlifeThe bright yellow flowers attract hummingbirds, bees, and other pollinators throughout the blooming season. Cannas are valuable nectar sources in summer and fall gardens. [source]
Tropical Garden Design
CraftUsed as a focal point or backdrop in tropical and exotic garden designs; the large foliage and bold flowers create architectural interest and drama in landscape plantings. [source]
Traditional Herbal Use
MedicinalIn some cultures, canna rhizomes and leaves have been used in traditional medicine for anti-inflammatory and digestive purposes, though scientific validation is limited. [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 for ornamental flowers, not harvested. Cut flower stems with 2-3 open blooms in early morning for fresh arrangements; they last 5-7 days in water. For rhizome division, dig after foliage dies back in fall; clean, dry, and store until spring replanting.
Fun Facts
- 🌱 Yellow King Humbert was developed in the early 1900s and remains one of the most recognizable canna cultivars worldwide, prized for its showy spotted petals that distinguish it from solid-colored varieties.
- 🌱 Cannas are closely related to bananas and gingers and share similar tropical growing requirements; they are sometimes called 'Canna lilies' though they're not true lilies.
- 🌱 In zones 7-8, Yellow King Humbert rhizomes can be left in the ground if heavily mulched (6-12 inches), though digging and storing ensures better survival rates and reliability for rebloom.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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