Garden Dahlia (Dahlia pinnata)

Garden Dahlia

Dahlia pinnata

Vibrant, ruffled blooms paint summer gardens with warm hues. Herbaceous flowering perennial; common name: garden dahlia.

Full sun
2–3/week
Moderate
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Plant Needs

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Sunlight Full sun to partial shade; needs at least 6 hours of direct sunlight for abundant blooming; provide afternoon shade in extreme heat
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Watering Water deeply when the top 5 cm of soil is dry; avoid overwatering to prevent root rot and fungal growth
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Temperature Thrives in 15–25°C; protect from frost as tubers are frost-tender and will die back in freezing conditions
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Characteristics

  • Leaf: Opposite, pinnately compound leaves with serrated margins; deep green, textured surface
  • Flower: Large composite flower heads in shades of red, pink, yellow, white, or purple; double or single petal forms
  • Stem: Erect, hollow, green to reddish-brown stems with branching growth
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Care Guide

Watering

Keep soil consistently moist but not waterlogged; apply mulch to retain soil moisture

Fertilization

Apply balanced liquid fertilizer every 2 weeks. Avoid high-nitrogen fertilizers to prevent excessive foliage growth at the expense of flower production

Banana peel compost tea:Compost banana peels for 2–4 weeks; steep in water for 24 hours, dilute 1:20 for root drench to support flower development and tuber health
Pruning
  • Pinch back young shoots when 15 cm tall to encourage bushy growth and increase flower count
  • Deadhead spent flower heads regularly to prolong the blooming season
  • Cut back foliage to 10 cm above soil after first frost; lift tubers for dry, cool storage in frost-prone regions
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: Non-toxic; no adverse effects reported for cats

Humans: No known toxic effects to humans from ingestion or contact

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Garden Uses & Culture

Culture: Symbolizes elegance, dignity, and lasting commitment in floral symbolism

Usage: Ornamental garden plant; popular cut flower for floral arrangements