Field Jointed Glasswort (Polycnemum arvense)

Field Jointed Glasswort

Polycnemum arvense

Delicate, thread-like foliage creates a wispy, airy texture. Annual herbaceous wildflower; common name: Field Jointed Glasswort.

Full sun
1–2/week
Beginner
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Plant Needs

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Sunlight Requires full sun exposure; thrives in open, unshaded dry habitats
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Watering Drought-tolerant species; water only during prolonged dry spells to avoid root rot
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Temperature Hardy to mild frost; performs best in cool to warm temperate conditions
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Characteristics

  • Leaf: Reduced to small, scale-like appressed bracts along slender stems
  • Flower: Tiny greenish-white blooms clustered in bract axils
  • Stem: Slender, jointed, succulent, ranging from pale green to reddish
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Care Guide

Watering

Water sparingly during active growth; allow soil to fully dry between waterings

Fertilization

No regular fertilization required; nutrient-rich soils may reduce flowering. Avoid adding fertilizers, as the plant adapts to low-nutrient habitats

Dried eggshell powder:Sprinkle finely crushed, dried eggshells around the base to add calcium without overfertilizing; avoid applying to wet soil
Pruning
  • Remove spent flower heads to prevent unwanted self-seeding if desired
  • Clear dead foliage after the plant dies back in late autumn
  • Avoid heavy pruning, as the low-growing form requires minimal shaping
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: No documented toxicity to cats (ASPCA unlisted, no known risks)

Humans: No documented toxicity to humans

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Garden Uses & Culture

Culture: N/A

Usage: Ornamental ground cover for rock gardens and wildflower plantings