Purple Knight Plant (Alternanthera brasiliana)

Purple Knight Plant

Alternanthera brasiliana

Vibrant purple foliage adds bold color to borders or pots. Compact herbaceous perennial.

Partial sun
1–2/week
Beginner
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Plant Needs

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Sunlight Bright indirect to partial direct sun; full sun enhances purple foliage color, avoid intense midday summer sun
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Watering Water when the top 2 cm of soil feels dry; avoid overwatering to prevent root rot
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Temperature Thrives at 18–27℃; protect from frost and temperatures below 10℃
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Characteristics

  • Leaf: Oval to lanceolate leaves with deep purple, velvety texture; opposite stem arrangement
  • Flower: Tiny, inconspicuous white clustered blooms at leaf axils
  • Stem: Succulent, greenish-purple stems that root easily from stem cuttings
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Care Guide

Watering

Keep soil consistently moist but not waterlogged

Fertilization

Diluted balanced feed every 2 weeks. Avoid over-fertilizing to prevent leggy, pale growth

Banana peel compost tea:Soak fully composted banana peels in water for 24 hours, dilute 1:20 for root drench; discard solids to avoid pest infestations
Pruning
  • Pinch back stem tips regularly to encourage bushy, compact growth
  • Remove faded blooms and yellowing leaves to maintain a tidy appearance
  • Trim leggy stems in early spring to promote new, dense growth
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA-verified non-toxic to cats; no reported toxicity

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

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Garden Uses & Culture

Culture: N/A

Usage: Ornamental foliage for edging, hanging baskets, or ground cover