How to Grow Scarlet Nymph
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Scarlet Nymph
Gesneria cardinalis
flowerGesneria cardinalis is a tropical perennial in the Gesneriaceae family native to Puerto Rico, prized for its stunning scarlet-red tubular flowers that attract hummingbirds and pollinators. This compact herbaceous plant produces attractive dark green, velvety foliage and blooms prolifically under proper conditions. It thrives as a houseplant or in warm greenhouse environments and is relatively easy to cultivate compared to other gesneriad species.
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Example Scarlet Nymph timeline · Pittsburgh, PA (Zone 6b)
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Plant Scarlet Nymph
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 Scarlet Nymph blooms
Around Aug 15≈ 120 days after planting
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Growing Conditions
Soil
Growing Zones
Find your zone →Zones 10-11; grow outdoors year-round in frost-free regions, or as a container houseplant moved indoors during winter in cooler climates
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Get my Scarlet Nymph timeline →Growth Stages
Seed Germination
2-4 weeksTiny seeds develop first leaves; seedlings are very fragile with primitive root systems
Maintain 70-75°F, high humidity (60-80%), and bright indirect light. Keep soil consistently moist using bottom watering or misting. Provide air circulation to prevent damping off
Seedling
4-6 weeksFirst true leaves emerge; small rosette of delicate foliage develops
Continue high humidity and consistent moisture. Gradually introduce more air circulation. Avoid fertilizing until established. Thin seedlings if crowded
Vegetative Growth
6-10 weeksPlant develops multiple stems and larger velvety dark green leaves; forms a compact mounding habit
Maintain bright indirect light, moderate warmth (65-75°F), and even moisture. Begin light fertilizing monthly with diluted houseplant fertilizer. Pinch growing tips to promote bushiness
Flowering
8-12 weeks (repeated cycles)Terminal tubular scarlet-red flowers appear in clusters at branch tips; blooms are 1-2 inches long and highly attractive to hummingbirds
Maintain consistent moisture and humidity; avoid disturbing plants during bloom. Continue fertilizing every 2-3 weeks with bloom-promoting formula. Provide 12-14 hours of bright light daily to maximize flowering
Fruiting & Seed Set
4-6 weeksSpent flowers develop small seed capsules; foliage may become slightly less robust as plant directs energy to seed production
Allow some flowers to set seed for propagation, or deadhead spent blooms to encourage continuous flowering. Maintain regular care schedule. Seeds mature in approximately 4-6 weeks
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Increase humidity through misting; spray with insecticidal soap or neem oil; isolate affected plants to prevent spread
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Remove with rubbing alcohol on cotton swab; spray with insecticidal soap; treat systematically every 7-10 days until clear
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Use yellow sticky traps; spray undersides of leaves with insecticidal soap or neem oil; increase air circulation
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Allow soil surface to dry slightly between waterings; use yellow sticky traps; apply sand mulch to soil surface; consider bottom watering only
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Improve air circulation; reduce humidity slightly; remove affected leaves; spray with sulfur dust or potassium bicarbonate fungicide; avoid wetting foliage
Uses
Edible Flowers
CulinaryThe vibrant scarlet flowers are edible and can be used as elegant garnishes in gourmet cooking and specialty cocktails, adding visual appeal and a subtle delicate flavor to dishes. [source]
Hummingbird Attraction
WildlifeGesneria cardinalis is highly attractive to hummingbirds and other nectar-feeding birds due to its bright red tubular flowers and abundant nectar production, making it excellent for wildlife gardens. [source]
Indoor Ornamental Plant
HouseholdIts compact size, attractive velvety foliage, and prolific scarlet blooms make it an ideal houseplant for bright window sills, terrariums, and indoor gardens, providing year-round visual interest. [source]
Traditional Medicine Uses
MedicinalIn its native Puerto Rico, Gesneria species have been used traditionally in folk medicine for various remedies, though scientific research on specific medicinal properties remains limited. [source]
Cut Flower Arrangements
CraftThe long-lasting scarlet tubular flowers are excellent for floral arrangements and can be cut and placed in water for indoor display, lasting 1-2 weeks with fresh water changes. [source]
This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.
Harvest Tips
For seed collection: Allow some flowers to mature into seed pods; harvest when capsules turn brown and papery (4-6 weeks after flowering). Dry capsules fully, then shake seeds into envelope and store in cool, dry location. For continuous flowering, deadhead spent blooms regularly to redirect energy from seed production into new flower development
Fun Facts
- 🌱 Gesneria cardinalis is the national flower of Puerto Rico and represents the island's natural biodiversity
- 🌱 The genus Gesneria is named after Conrad Gesner, a 16th-century Swiss naturalist and polymath, with the family Gesneriaceae including over 3,500 species of tropical plants
- 🌱 The brilliant scarlet color of the flowers is specifically adapted to attract hummingbirds, which lack the ability to see red wavelengths well but are strongly attracted to red flowers as food sources
Gardening Terms
New to gardening? Learn about terms used in this guide:
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