How to Grow Gloxinia, Macrantha Sinningia
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Gloxinia, Macrantha Sinningia
Sinningia macrantha
flowerSinningia macrantha is a compact gesneriad native to Brazil, prized for its stunning large trumpet-shaped flowers in shades of red, pink, or purple with contrasting darker veining. It produces velvety, heart-shaped leaves and blooms prolifically indoors with proper care. This tender perennial is typically grown as a houseplant or in humid greenhouses.
When should you plant Gloxinia, Macrantha Sinningia in your zone?
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Example Gloxinia, Macrantha Sinningia timeline · Pittsburgh, PA (Zone 6b)
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Plant Gloxinia, Macrantha Sinningia
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 Gloxinia, Macrantha Sinningia blooms
Around Jun 16≈ 60 days after planting
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Growing Conditions
Soil
Growing Zones
Find your zone →Zones 11-12 outdoors; grown as houseplant or in greenhouse in colder zones
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Dormancy/Tuber Rest
2-4 months (November-March typically)Plant appears dead; tuber is resting underground, often after flowering period
Store tubers in cool (50-60°F), dry location; minimal water; check monthly for rot; keep in darkness
Sprouting
2-3 weeksNew shoots emerge from tuber; tiny leaves unfurl at soil surface
Increase watering gradually; place in warm location (70-75°F); provide bright indirect light; begin dilute feeding weekly
Vegetative Growth
3-4 weeksBushy foliage develops with velvety heart-shaped leaves; plant fills out rapidly
Maintain warm temperatures (70-80°F); high humidity (50-70%); consistent moisture; feed weekly with half-strength balanced fertilizer; pinch tips for bushiness
Flowering
6-12 weeks or longer with good careLarge tubular trumpet flowers emerge on long peduncles; flowers can be 2+ inches long; blooms appear continuously
Maintain humidity and consistent watering; support tall flower stems with stakes; remove spent flowers; continue feeding weekly with low-nitrogen fertilizer (higher phosphorus/potassium)
Post-Flowering/Dormancy Transition
2-3 weeks transition, then 2-4 months dormancyFlowers fade; foliage begins to yellow and die back naturally
Gradually reduce watering over 2-3 weeks; stop fertilizing; allow plant to enter dormancy; remove dead foliage; store tuber in cool, dry place
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Inspect foliage regularly; isolate affected plants; spray with insecticidal soap or neem oil every 7-10 days; wipe leaves with cotton swab dipped in rubbing alcohol
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Increase humidity to 60%+; spray undersides of leaves with water or neem oil; use miticide if severe; improve air circulation
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Remove affected flowers; use yellow sticky traps; spray with insecticidal soap; maintain high humidity as deterrent
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Improve air circulation; reduce leaf wetness; spray with fungicide (sulfur or potassium bicarbonate); remove affected leaves; maintain 50-60% humidity, not higher
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Ensure excellent drainage; do not overwater; allow proper dormancy period; store tubers in dry conditions; discard severely affected tubers
Uses
Indoor Ornamental Display
HouseholdSinningia macrantha is prized as a decorative houseplant, adding exotic color and tropical beauty to indoor spaces. The dramatic trumpet flowers make stunning focal points on shelves, plant stands, or in terrariums. [source]
Flower Arranging & Cut Flowers
CraftThe long-stemmed trumpet flowers make excellent additions to fresh floral arrangements and bouquets. Flowers last 5-7 days in water, providing long-lasting color. [source]
Pollinator Attraction
WildlifeThe tubular flowers attract hummingbirds and other pollinators, particularly when grown outdoors in tropical climates. The nectar-rich blooms support small bird species. [source]
Humidity-Loving Terrarium Plant
HouseholdMacrantha thrives in closed or humid terrariums and vivariums, where its compact size and preference for high humidity make it an excellent choice for creating bioactive plant displays. [source]
Edible Flowers
CulinaryThe flowers are non-toxic and can be used as an edible garnish for desserts or beverages, adding visual interest to special dishes (use flowers grown without pesticides). [source]
Harvest Tips
Pinch off spent flowers regularly to encourage continuous blooming; cut flowers last 5-7 days in water; harvest leaves for propagation during active growth; no edible harvest—ornamental only
Fun Facts
- 🌱 Sinningia macrantha is named for its exceptionally large ('macr') flowers ('anthus'), which can measure over 2 inches long despite the plant's compact, modest size—a remarkable proportion
- 🌱 Unlike many Sinningia species, macrantha is one of the few that grows from a tuber rather than a rhizome, entering complete dormancy and allowing gardeners to store and rejuvenate the plant year after year
- 🌱 This species is part of the Gesneriad family (Gesneriaceae), which includes over 3,500 species, many equally dramatic in appearance; African violets, streptocarpus, and episcia are all close relatives
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