How to Grow Flame Spike
Flame Spike
Odontonema cuspidatum
shrubFlame Spike is a tropical shrub prized for its brilliant red-orange tubular flowers that bloom in dense spikes from mid-summer through fall. Native to Mexico, it grows as an evergreen perennial in warm climates and reaches 3-6 feet tall, attracting hummingbirds and butterflies. The dark green, lance-shaped foliage provides an attractive backdrop to the vibrant flower displays.
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Example Flame Spike timeline · Pittsburgh, PA (Zone 6b)
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Plant Flame Spike
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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Harvest Flame Spike
Around Jul 16≈ 90 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Flame Spike dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 9b-11; can be grown in containers and brought indoors in cooler zones
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Establishment
3-4 weeksYoung transplant with limited branching and dark green foliage establishing root system
Water regularly to keep soil moist. Protect from strong winds. Avoid fertilizing immediately; allow roots to establish for 2-3 weeks.
Vegetative Growth
4-6 weeksPlant develops multiple stems and fuller branching structure; foliage expands significantly
Pinch back shoot tips to encourage bushier growth. Fertilize monthly with balanced fertilizer. Remove any weak or damaged branches.
Pre-flowering
2-3 weeksStem tips thicken and buds begin forming at branch ends; leaves may appear slightly narrower
Maintain consistent moisture and warmth (above 60°F). Continue fertilizing with bloom-promoting formula (higher phosphorus). Reduce nitrogen to encourage flowering.
Flowering
6-12 weeksDense spikes of tubular red-orange flowers emerge and open sequentially along stems; peak color display
Continue watering regularly; flowers develop best with consistent moisture. Deadhead spent flowers to encourage continued blooming. Provide afternoon shade in hottest climates (above 95°F).
Dormancy/Winter
3-4 monthsFlower production slows or stops; growth becomes minimal. Foliage may yellow slightly in cool temperatures.
Reduce watering frequency significantly. In zones below 10, bring containers indoors or mulch heavily. Minimal fertilizing needed. Prune lightly in late winter to shape plant.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Spray with insecticidal soap or neem oil every 7-10 days. Encourage natural predators like ladybugs. Remove heavily infested leaves.
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Increase humidity by misting foliage. Apply miticide or neem oil spray. Wash leaves with strong water spray to dislodge mites.
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Spray with insecticidal soap or horticultural oil. Remove affected areas with pruning. Apply systemic insecticide if severe.
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Prune out heavily infested branches. Spray with horticultural oil during dormant season. Apply insecticidal soap to stems and leaves.
Uses
Hummingbird and Butterfly Magnet
WildlifeThe tubular red-orange flowers are a prime nectar source for hummingbirds, ruby-throated hummingbirds especially, and attract numerous butterfly species. Blooming continuously from mid-summer through frost makes it essential for late-season pollinator support. [source]
Cut Flower Arrangements
HouseholdThe striking flower spikes make excellent long-lasting cut flowers for tropical and warm-climate floral arrangements. Harvest spikes in the morning when fully hydrated for maximum vase life of 5-7 days. [source]
Edible Flowers
CulinaryThe tubular flowers are edible and can garnish tropical cocktails and desserts, offering visual appeal and a mild, slightly sweet flavor. Ensure no pesticides have been applied before consuming. [source]
Tropical Landscape Accent
HouseholdFlame Spike's vibrant color and upright growth habit make it a dramatic focal point in tropical and subtropical gardens. Use as a specimen plant, in mixed borders, or in containers on patios and porches. [source]
Traditional Herbal Use
MedicinalIn its native Mexico and Central America, Flame Spike has been used in traditional herbalism, though scientific research is limited. Some sources suggest mild anti-inflammatory properties in leaf preparations. [source]
This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.
Harvest Tips
Flame Spike is ornamental; no harvest in traditional sense. Cut flowers last 5-7 days in a vase with fresh water. Prune stems in late winter before new growth to maintain shape and size. Cut stems at 45-degree angle just above a leaf node.
Fun Facts
- 🌱 Flame Spike was previously classified under the genus Jacobinia and is still sometimes sold under that name in nurseries.
- 🌱 The plant's genus name 'Odontonema' comes from Greek words meaning 'tooth' and 'thread,' referring to the appearance of the flowers' reproductive structures.
- 🌱 Hummingbirds can visit Flame Spike flowers dozens of times per day during peak blooming season, making it one of the most valuable plants for these birds in warm regions.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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