Garden Dahlia (Dahlia hortensis)

Garden Dahlia

Dahlia hortensis

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; requires at least 6 hours of direct sunlight for abundant blooming
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Watering Water deeply when the top 5 cm of soil is dry; avoid overwatering to prevent root rot
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Temperature Thrives in 15–25°C; protect tubers from frost as they are frost-tender
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Characteristics

  • Leaf: Opposite, pinnately compound leaves with serrated margins, deep green
  • Flower: Large composite flower heads in diverse colors (red, pink, yellow, white) with ruffled or flat ray florets
  • Stem: Erect, hollow green stems with branching growth
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Care Guide

Watering

Keep soil consistently moist but not waterlogged

Fertilization

Diluted balanced feed every 2 weeks. Discontinue fertilization 4 weeks before expected first frost to harden tubers

Banana peel compost tea:Fully compost banana peels, dilute 1:20 with water for root drench to support vibrant flower production
Pruning
  • Deadhead spent blooms regularly to encourage continuous flowering
  • Pinch back young stems in early spring to promote branching and increase flower count
  • Cut back stems to ground level after first frost before lifting tubers for storage
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: Non-toxic to cats

Humans: No known toxic effects on humans

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Garden Uses & Culture

Culture: Symbolizes elegance and dignity in floral arrangements

Usage: Ornamental garden plant and cut flower for bouquets