Hairy Crabgrass (Digitaria sanguinalis)

Hairy Crabgrass

Digitaria sanguinalis

It spreads fast in warm lawns, a tenacious ground cover. Annual grassy weed; common names: hairy crabgrass, large crabgrass.

Full sun
1–2/week
Beginner
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Plant Needs

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Sunlight Full sun to partial sun; tolerates compacted soil and dry, low-nutrient conditions
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Watering Drought-tolerant; water only during prolonged dry spells to maintain growth
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Temperature Thrives in warm temperatures; dies back after the first autumn frost
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Characteristics

  • Leaf: Flat, linear leaves with hairy margins, 5–15 cm long
  • Flower: Branched spike-like inflorescences bearing tiny greenish flowers
  • Stem: Prostrate or ascending stems that root at lower nodes
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Care Guide

Watering

Water occasionally during extended dry periods; avoid overwatering to prevent excessive spread

Fertilization

Minimal fertilization; avoid high-nitrogen feeds that promote weed growth. For forage use, apply mild organic feeds sparingly to support foliage growth

Compost tea:Use fully composted tea diluted 1:20 to provide mild nutrients without overstimulating aggressive spread
Pruning
  • Mow regularly to prevent seed head formation and limit spread in lawns
  • Pull young plants by hand before stems root at nodes to avoid regrowth
  • Apply mulch to garden beds to suppress seed germination
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: Non-toxic to cats

Humans: No known toxic effects on humans

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Garden Uses & Culture

Culture: N/A

Usage: Occasionally used as forage for livestock; considered a problematic lawn weed in most regions