Redroot Pigweed (Amaranthus retroflexus)

Redroot Pigweed

Amaranthus retroflexus

It spreads quickly in disturbed soils, a hardy wild green with understated blooms. Annual herbaceous weed; common name: redroot pigweed.

Full sun
0–1/week
Beginner
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Plant Needs

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Sunlight Prefers full sun; tolerates partial shade in hot, arid climates
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Watering Drought-tolerant; requires minimal supplemental water once established; avoid overwatering
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Temperature Thrives in warm temperatures; mature plants tolerate light frost but are killed by hard freezes below -5°C
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Characteristics

  • Leaf: Simple, ovate to lanceolate leaves with smooth margins, bright green, up to 15 cm long
  • Flower: Dense greenish-white terminal spikes, small and inconspicuous
  • Stem: Erect, reddish at the base (redroot trait), branched in upper sections
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Care Guide

Watering

Keep soil slightly moist for young seedlings; mature plants tolerate dry conditions

Fertilization

No regular fertilization needed; tolerates low-nutrient soils. Excess nitrogen may increase nitrate accumulation in foliage

Eggshell powder topdressing:Crush dried eggshells into fine powder; sprinkle lightly on soil surface to add calcium without increasing nitrate levels
Pruning
  • Pull or cut plants before seed set to prevent unwanted spread in garden areas
  • Thin dense stands to improve airflow and reduce competition for resources
  • Remove dead foliage in autumn to reduce overwintering seed banks
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: Non-toxic to cats; no known adverse effects

Humans: May accumulate nitrates in high-nitrogen soils; mild gastrointestinal upset if large quantities are ingested

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Garden Uses & Culture

Culture: N/A

Usage: Edible young leaves as a cooked wild green; used for soil erosion control in disturbed areas