How to Grow Smithiantha
iNaturalist
Smithiantha
Smithiantha spp.
flowerSmithiantha is a tropical houseplant in the Gesneriaceae family, prized for its velvety foliage and tubular flowers in shades of red, orange, pink, or yellow. These rhizomatous plants thrive indoors and produce attractive, long-lasting blooms on tall spikes above mottled or patterned leaves. They are typically grown as seasonal bloomers and require warm, humid conditions similar to their native Central American rainforest habitat.
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Example Smithiantha timeline · Pittsburgh, PA (Zone 6b)
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Plant Smithiantha
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 Smithiantha blooms
Around Jul 16≈ 90 days after planting
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Growing Conditions
Soil
Growing Zones
Find your zone →Zones 10b-11; grown as houseplants in cooler climates
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Dormancy
2-4 monthsRhizomes are stored dry and cool; foliage has died back completely
Store rhizomes in cool (50-60°F), dry conditions over winter or between growing seasons; check occasionally for mold or decay
Sprouting & Vegetative
4-6 weeksShoots emerge from rhizomes; foliage develops with characteristic mottled or velvety texture; leaves grow larger and more ornamental
Plant rhizomes in warm soil (70°F+); provide bright, indirect light and consistent moisture; maintain high humidity (50-70%); begin fertilizing with diluted balanced fertilizer every 2 weeks
Bud Development
3-4 weeksFlower spikes begin to form; buds cluster at the top of tall stems; foliage reaches near-full size
Maintain warmth and humidity; ensure bright light to encourage blooming; do not let soil dry out; continue regular fertilizing with balanced or slightly higher phosphorus formula
Flowering
4-8 weeks total (varies by variety)Tubular flowers open sequentially up the spike; blooms may last 2-4 weeks per spike; multiple spikes may bloom staggered
Maintain consistent moisture and humidity; provide 12-14 hours of light daily; avoid moving plant; deadhead spent flowers to encourage more blooms; keep temperatures between 65-75°F
Senescence & Dormancy
2-4 monthsFoliage yellows and dies back after flowering; plant enters rest period; rhizome becomes dormant underground
Gradually reduce watering as leaves fade; move to cooler location (55-60°F) if possible; cut back dead foliage; resume storage protocol until next growing season or force bloom again by replanting and warming
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Increase humidity; mist foliage regularly; spray with water or neem oil; isolate infested plants
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Remove with cotton swab dipped in rubbing alcohol; spray with insecticidal soap; ensure good air circulation
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Allow soil surface to dry slightly between waterings; use yellow sticky traps; apply mosquito dunks if severe
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Hand-remove with cloth; apply horticultural oil or neem oil; isolate plant to prevent spread
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Improve air circulation; reduce humidity slightly if severe; remove affected leaves; avoid wetting foliage; apply fungicide if necessary
Uses
Non-edible ornamental
CulinarySmithiantha is not edible and should not be consumed. It is purely ornamental and prized for indoor decoration. [source]
Cut flowers and arrangements
CraftSmithiantha flower spikes make beautiful, exotic cut flowers for vases and floral arrangements, lasting 1-2 weeks in water. The tall spikes add dramatic vertical interest to bouquets. [source]
Indoor foliage and flower display
HouseholdSmithiantha is prized as an indoor houseplant for its dual appeal: attractive velvety, often mottled foliage year-round (when in growth) and stunning tubular flowers in vibrant colors. It thrives in warm, humid indoor environments like bathrooms or terrariums. [source]
Terrarium and greenhouse specimen
CraftThe plant's love of humidity and warm temperatures makes it ideal for enclosed growing environments such as terrariums, vivariums, and warm greenhouses. It creates an exotic, rainforest-like aesthetic. [source]
Hummingbird attraction
WildlifeThe tubular flowers are attractive to hummingbirds and other nectar-feeding birds in outdoor tropical settings. Indoors, the plant provides visual interest mimicking natural bird garden displays. [source]
Harvest Tips
Smithiantha is grown for ornamental flowers, not harvest. Enjoy blooms in place or cut flower spikes for indoor arrangements; cut above a leaf node to potentially encourage side shoots. After flowering ends, allow plant to senesce naturally and store rhizomes for next season's growth.
Fun Facts
- 🌱 Smithiantha is named after Matilda Smith, a botanist and illustrator at Kew Gardens in England during the late 19th century, honoring her contributions to horticultural science.
- 🌱 The genus has been extensively hybridized, creating cultivars with flower colors ranging from deep crimson and scarlet to soft pink, coral, orange, and yellow, often with contrasting throats and spotted or striped patterns.
- 🌱 Smithiantha rhizomes can be stored dormant for extended periods, allowing growers to time blooms for specific seasons—a technique used by commercial growers to produce flowers for the holidays.
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