Annual Ryegrass (Lolium multiflorum)

Annual Ryegrass

Lolium multiflorum

It grows in dense, lush tufts, a staple for forage and cover. Cool-season herbaceous grass.

Full sun
1–2/week
Beginner
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Plant Needs

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Sunlight Full sun to partial shade; thrives in cool, overcast conditions and tolerates light shade
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Watering Keep soil consistently moist but not waterlogged; drought-tolerant once established
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Temperature Thrives in 10–20℃; tolerates light frost but suffers in temperatures above 28℃
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Characteristics

  • Leaf: Flat, linear bright green blades with pointed tips, 10–30 cm long
  • Flower: Spike-like inflorescences bearing small greenish florets arranged alternately
  • Stem: Slender, hollow, smooth stems forming dense clumps
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Care Guide

Watering

Keep soil evenly moist during active growth periods

Fertilization

Apply balanced diluted feed every 2 weeks. Use low-nitrogen fertilizer to promote healthy foliage without excessive stem elongation

Composted eggshell powder slurry:Mix 1 tbsp fully composted eggshell powder with 1 gallon of water; drench soil monthly to improve soil structure and nutrient availability
Pruning
  • Trim back overgrown clumps to 5–10 cm height to encourage dense new growth
  • Remove dead or yellowed foliage to maintain plant health and airflow
  • Cut back to 5 cm height after flowering to promote regrowth for forage or cover crop use
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: Toxic; may cause muscle tremors, seizures, and weakness from endophyte-produced tremorgenic toxins

Humans: Mild gastrointestinal upset if large quantities of endophyte-infected grass are ingested

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Garden Uses & Culture

Culture: N/A

Usage: Livestock forage, cover crop, erosion control, temporary lawn grass