How to Grow Slender dayflower
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Slender dayflower
Commelinella dianthoidea
flowerCommelinella dianthoidea is a delicate, low-growing flowering plant in the Commelinaceae family, native to Mexico and Central America. It produces small, bright blue flowers that typically open in the morning and close by afternoon. This tender perennial is prized for its ornamental foliage and charming blooms in container and garden settings.
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Example Slender dayflower timeline · Pittsburgh, PA (Zone 6b)
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Plant Slender dayflower
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 Slender dayflower blooms
Around Jun 16≈ 60 days after planting
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Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 10-11; grown as an annual or houseplant in cooler zones
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Get my Slender dayflower timeline →Growth Stages
Seedling
3-4 weeksTiny, delicate leaves emerge; very slow initial growth. Plant appears fragile with 2-4 true leaves.
Maintain high humidity (60-80%), provide bottom heat (70-75°F), use grow lights if indoors. Keep soil consistently moist. Avoid direct sun.
Vegetative growth
4-8 weeksPlant develops creeping or mounding stems with lance-shaped, thin leaves. Foliage becomes fuller and more ornamental.
Pinch back growing tips to encourage branching and fuller shape. Maintain consistent moisture and humidity. Begin fertilizing every 2-3 weeks with dilute, balanced fertilizer.
Pre-flowering
2-3 weeksStems elongate slightly, foliage density increases, flower buds begin to form at stem tips.
Continue regular fertilizing, preferring slightly higher phosphorus to promote blooming. Ensure adequate indirect light. Maintain humidity and steady moisture.
Flowering
8-16 weeks or longer indoorsDelicate, typically blue (occasionally pink or white) ephemeral flowers open in morning, close by afternoon. Continuous blooming occurs over weeks to months.
Deadhead spent flowers to extend blooming. Maintain consistent care regimen. Reduce nitrogen slightly to avoid excessive foliage at expense of flowers.
Dormancy/rest
2-4 monthsGrowth slows significantly in cooler months or with reduced light. Foliage may yellow; plant becomes semi-dormant.
Reduce watering frequency. Lower fertilization or stop entirely. Provide cooler temperatures (50-60°F). Maintain humidity with occasional misting. Prune back dead material.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Increase humidity through misting and grouping plants. Spray with water or insecticidal soap weekly if infested. Neem oil effective in severe cases.
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Remove with rubbing alcohol on a cotton swab. Spray with insecticidal soap or neem oil every 7-10 days.
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Ensure excellent drainage and avoid overwatering. Remove affected roots and repot in fresh soil. Improve air circulation.
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Spray forcefully with water to dislodge. Use insecticidal soap or horticultural oil if needed.
Uses
Indoor houseplant
OrnamentalCommelinella dianthoidea makes an excellent choice for bright bathrooms, vivariums, and terrariums where its love of humidity and moist soil can be accommodated. Its delicate trailing or creeping habit suits hanging baskets and shelf displays. [source]
Tropical container gardens
OrnamentalThrives in mixed container plantings with other shade-loving, humidity-preferring plants. Ideal for tropical-themed gardens and shade borders in warm climates. [source]
Pollinator support
WildlifeThough small and delicate, the flowers attract bees and other small pollinators. Provides a nectar source in humid, shaded garden areas. [source]
Botanical propagation hobby
CraftEasy to propagate from stem cuttings, making it a rewarding project for plant enthusiasts interested in plant propagation techniques and tissue culture. [source]
Harvest Tips
Not typically harvested as this is an ornamental flower. Simply enjoy the blooms as they open daily. Deadhead spent flowers to encourage continued blooming. Collect seeds if desired once flower develops small seed capsules.
Fun Facts
- 🌱 Commelinella dianthoidea belongs to the Commelinaceae family, known for their ephemeral (short-lived) flowers that bloom for a single day—hence the common name 'dayflower.' The flowers close permanently by afternoon.
- 🌱 This plant is sometimes called the 'inch plant' relative to its slow, creeping growth habit when used as a groundcover, though true 'inch plants' (Tradescantia zebrina) are more vigorous.
- 🌱 The genus Commelinella was named in honor of the Commelin brothers, Dutch botanists and naturalists from the 17th century.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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