Climbing Hydrangea (Hydrangea anomala subsp. petiolaris)

Climbing Hydrangea

Hydrangea anomala subsp. petiolaris

Lush climbing foliage unfurls delicate lacecap blooms in summer. Deciduous woody vine; common name: Climbing Hydrangea.

Partial sun
1–2/week
Moderate
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Plant Needs

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Sunlight Partial to full shade; tolerates morning sun but avoid harsh midday direct sun which can scorch leaves
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Watering Water deeply when top 5–7 cm of soil is dry; avoid overwatering to prevent root rot
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Temperature Hardy to -15°C; prefers cool to temperate temperatures, avoid prolonged heat above 28°C
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Characteristics

  • Leaf: Opposite, ovate to heart-shaped, dark green, serrated margins, turning yellow in autumn
  • Flower: Flat lacecap inflorescences with small fertile flowers surrounded by larger sterile white blooms
  • Stem: Woody, clinging aerial roots for climbing vertical surfaces
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Care Guide

Watering

Keep soil consistently moist; apply mulch to retain moisture

Fertilization

Diluted balanced fertilizer once monthly. Discontinue fertilization in late summer to prepare plants for dormancy

Composted banana peel tea:Fully compost banana peels, steep in water for 3 days, dilute 1:20 for root drench; avoid raw peels to prevent pest infestations
Pruning
  • Remove dead or damaged stems in late winter before new growth emerges
  • Thin overcrowded branches to improve airflow and light penetration
  • Trim back excessive growth after flowering to maintain desired shape and size
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA confirmed toxic; ingestion can cause vomiting, diarrhea, lethargy, and abdominal pain

Humans: Ingestion of large quantities may cause mild gastrointestinal upset including nausea and diarrhea

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Garden Uses & Culture

Culture: Symbolizes gratitude and heartfelt emotion in traditional floral symbolism

Usage: Ornamental climbing vine for covering walls, arbors, and shaded garden structures