Odontonema sessile
Odontonema sessile
Firespike
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Taxonomy
Family Acanthaceae · Genus Odontonema
Common Names
Firespike
Context
nativeRegion
Central America, especially southern Mexico to Costa Rica.
usdaZones
10–11 (grown as an annual or container plant in cooler zones).
companionPlants
Justicia carnea, Cestrum aurantiacum, Salvia
culturalUses
Primarily ornamental for its attractive flowers and use in pollinator gardens; attracts hummingbirds and butterflies.
Care
Care Requirements
LightPrefers bright, indirect light but can tolerate partial shade.
WateringWater moderately; allow the top inch of soil to dry between waterings.
SoilWell-draining, rich organic soil. Tolerates sandy to loamy mixes.
FertilizerFeed with a balanced liquid fertilizer during the growing season (spring-summer) monthly.
HumidityAppreciates moderate to high humidity but is fairly adaptable.
TemperatureThrives in warm conditions, ideally 18–28°C (65–82°F); sensitive to frost.
Growth & Life Cycle
HabitEvergreen shrub with upright stems and lush foliage.
Mature SizeTypically grows 1–2 m (3–6 ft) tall, sometimes up to 3 m (10 ft).
Growth RateFast-growing under optimal conditions.
BloomingProduces conspicuous red to crimson tubular flowers, primarily in summer to autumn.
DormancyNo true dormancy but growth slows in cooler temperatures.
Propagation
Methodsstem cuttings, division
DifficultyEasy
Best SeasonSpring to early summer
Maintenance & Notes
PruningPrune after flowering or to maintain shape and encourage bushiness.
RepottingRepot every 2–3 years or when root-bound.
Pests & DiseasesGenerally pest-free; may rarely encounter aphids or spider mites. Avoid waterlogging to prevent root rot.
ToxicityNot known to be toxic to humans or pets.
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