Collard Greens (Brassica oleracea var. viridis)

Collard Greens

Brassica oleracea var. viridis

Lush, crinkly leaves offer earthy flavor and robust green beauty. Edible leafy vegetable; common name: collard greens.

Full sun
2–3/week
Beginner
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Plant Needs

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Sunlight Full sun to partial shade; 4–6 hours of direct daily sun supports optimal leaf growth and color
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Watering Water deeply when the top 2–3 cm of soil dries out; avoid overwatering to prevent root rot
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Temperature Thrives in 15–25°C; tolerates light frost down to -2°C but may bolt early in extreme heat above 32°C
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Characteristics

  • Leaf: Large, broad dark green leaves with crinkled or smooth margins; arranged in a dense basal rosette
  • Stem: Thick, rigid central stem; branches only when the plant bolts to produce flowers
  • Flower: Small four-petaled yellow flowers in elongated racemes (visible only after bolting)
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Care Guide

Watering

Keep soil consistently moist; increase frequency during hot, dry spells

Fertilization

Apply balanced, diluted fertilizer every 2 weeks. Prioritize nitrogen-rich feeds to support leafy growth

Composted banana peel tea:Soak fully composted banana peels in water for 24 hours; dilute 1:20 with water for root drench to boost leaf health and color
Pruning
  • Harvest outer mature leaves regularly to encourage new inner leaf growth
  • Remove bolted flower stalks promptly to redirect energy back to leaf production
  • Trim yellowing or damaged leaves to improve airflow and reduce disease risk
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: Non-toxic; small amounts pose no health risk to cats

Humans: No known toxic effects; safe for human consumption as a leafy vegetable

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Garden Uses & Culture

Culture: Closely associated with Southern U.S. soul food; valued as a sustainable, nutrient-dense edible crop

Usage: Edible leafy vegetable (cooked or raw in salads); ornamental edible garden plant