Bellard's Knotweed (Polygonum bellardii)

Bellard's Knotweed

Polygonum bellardii

Delicate, low-growing ground cover with tiny blooms. Annual herbaceous plant; common name: Bellard's Knotweed.

Full sun
1–2/week
Beginner
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Plant Needs

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Sunlight Full sun to partial shade; tolerates dry, exposed, low-nutrient sites
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Watering Drought-tolerant; water only when top 2 cm of soil is completely dry to avoid overwatering
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Temperature Thrives in warm temperate to Mediterranean climates; tolerates light frost down to 5°C
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Characteristics

  • Leaf: Narrow linear to lanceolate leaves, 1–3 cm long, pale green with smooth margins
  • Flower: Tiny pink to white clustered blooms in axillary spikes, less than 5 mm across
  • Stem: Slender, branching, prostrate to ascending stems with subtle reddish tinges
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Care Guide

Watering

Water occasionally during extended dry spells to maintain foliage

Fertilization

Optional diluted balanced feed once monthly. No regular fertilization required for healthy growth

Composted eggshell powder:Sprinkle a thin layer on soil surface to boost calcium levels; avoid direct contact with stems
Pruning
  • Deadhead spent blooms to prevent unwanted self-seeding in managed gardens
  • Trim back dying foliage in autumn to tidy the planting area
  • Thin overcrowded stems to improve airflow and reduce disease risk
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: No reported toxicity to cats

Humans: No documented toxic effects for humans

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Garden Uses & Culture

Culture: N/A

Usage: Ground cover for erosion control, rock garden filler, and low-maintenance dry landscapes