Dillen's Speedwell (Veronica dillenii)

Dillen's Speedwell

Veronica dillenii

Delicate blue blooms carpet meadows like scattered sapphires. Low-growing herbaceous perennial; common name: Dillen's Speedwell.

Full sun
1–2/week
Beginner
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Plant Needs

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Sunlight Full sun to partial shade; tolerates short periods of dry shade in temperate regions
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Watering Water when the top 2 cm of soil dries completely; avoid overwatering to prevent root rot
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Temperature Hardy to -15°C; withstands cool spring temperatures and mild summer heat without stress
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Characteristics

  • Leaf: Oval to lanceolate, serrated margins, softly hairy texture
  • Flower: Tiny bright blue 4-petaled blooms, clustered in axillary spikes
  • Stem: Slender, creeping or ascending, covered in fine hairs
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Care Guide

Watering

Keep soil evenly moist during active bloom period

Fertilization

Light balanced feed once monthly. Use diluted, low-nitrogen feed to avoid excessive foliage growth over blooms

Eggshell powder topdress:Crush dried eggshells into fine powder; sprinkle lightly on soil surface to boost calcium levels without burning shallow roots
Pruning
  • Deadhead spent blooms promptly to encourage extended flowering into early summer
  • Trim back overgrown mats in late summer to maintain a compact, neat form
  • Remove yellowed or damaged foliage to improve airflow and reduce disease risk
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: No documented toxicity to cats

Humans: No documented toxicity to humans

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Garden Uses & Culture

Culture: N/A

Usage: Ground cover for rock gardens, wildflower meadows, and border edging