Giant Reed (Arundo donax)

Giant Reed

Arundo donax

Tall, graceful clumps sway like living wind chimes. Perennial grass; common name: giant reed.

Full sun
1–2/week
Beginner
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Plant Needs

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Sunlight Full sun to partial shade; tolerates coastal wind and salt spray exposure
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Watering Water deeply and infrequently; drought-tolerant once established; avoid waterlogging
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Temperature Hardy to -10°C; withstands high summer heat with consistent moisture
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Characteristics

  • Leaf: Long, linear blue-green leaves (30–60 cm long) with sharp, smooth margins
  • Flower: Feathery, silvery-white panicles up to 60 cm long
  • Stem: Thick, hollow, cane-like stems with a smooth, pale green to tan texture
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Care Guide

Watering

Keep soil consistently moist during active growth; avoid standing water

Fertilization

Apply balanced diluted feed once monthly. Avoid over-fertilizing to prevent weak, leggy stems

Banana peel compost tea:Compost banana peels for 2–3 weeks, steep in water for 24 hours, dilute 1:20 for root drench; discard solid peels to avoid pest infestations
Pruning
  • Cut back dead or damaged stems to ground level in late winter to stimulate new spring growth
  • Thin overcrowded clumps every 2–3 years to improve air circulation and reduce rhizome spread
  • Trim wayward stems to maintain desired shape in mid-summer
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: Non-toxic to cats; no known toxic compounds

Humans: Non-toxic to humans; no recorded adverse effects from ingestion or contact

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Garden Uses & Culture

Culture: N/A

Usage: Ornamental screening, erosion control, biofuel production