Blue Star Creeper (Isotoma fluviatilis)

Blue Star Creeper

Isotoma fluviatilis

Tiny star-shaped blooms carpet the ground like a blue constellation. Low-growing perennial groundcover; common name: Blue Star Creeper.

Full sun
2–3/week
Beginner
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Plant Needs

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Sunlight Full sun to partial shade; tolerates light afternoon shade in hot, arid climates to prevent leaf scorch
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Watering Keep soil consistently moist but not waterlogged; avoid allowing the root zone to dry out completely during summer heat
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Temperature Hardy to mild frosts; protect from prolonged temperatures below 5°C to prevent foliage damage
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Characteristics

  • Leaf: Small, oval, bright green, opposite arrangement, slightly succulent texture
  • Flower: Star-shaped, pale blue to white, 1–2 cm diameter, clustered at stem tips
  • Stem: Slender, trailing, rooting at nodes to form continuous groundcover mats
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Care Guide

Watering

Keep soil evenly moist; water when the top 1 cm of soil feels dry

Fertilization

Diluted balanced liquid feed every 4 weeks. Cease fertilization in autumn to allow the plant to enter dormancy

Banana peel compost tea:Soak fully composted banana peels in water for 24 hours; dilute 1:20 for root drenching; discard solid peels to avoid pest infestations
Pruning
  • Trim back overgrown stems in early spring to encourage compact, dense growth
  • Deadhead spent blooms regularly to extend the flowering period
  • Remove brown or damaged foliage to maintain a tidy appearance
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: Non-toxic to cats

Humans: No known toxicity to humans

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Garden Uses & Culture

Culture: N/A

Usage: Groundcover for gaps between pavers, rock garden filler, or trailing container plant