Garden Phlox (Phlox paniculata)

Garden Phlox

Phlox paniculata

Dense clusters of fragrant blooms paint summer gardens in soft hues. Herbaceous perennial flowering plant; common name: summer phlox.

Full sun
1–2/week
Beginner
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Plant Needs

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Sunlight Full sun to partial shade; blooms best in full sun, tolerates light afternoon shade in hot climates to prevent foliage scorch
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Watering Water deeply when top 2–3 cm of soil is dry; avoid overhead watering to reduce powdery mildew risk
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Temperature Hardy to USDA zones 4–8; tolerates cold winter dormancy and warm summer temperatures up to 35°C
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Characteristics

  • Leaf: Opposite, lance-shaped, dark green, 5–15 cm long, smooth margins
  • Flower: Dense terminal panicles of 5-petaled blooms; colors include pink, purple, white, red
  • Stem: Erect, green to reddish-green, sturdy, branching near the top
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Care Guide

Watering

Keep soil consistently moist but not waterlogged; increase frequency during prolonged heatwaves

Fertilization

Apply balanced slow-release fertilizer at planting. Avoid over-fertilizing to prevent excessive foliage growth at the expense of blooms

Banana peel compost tea:Compost banana peels for 2–3 weeks, steep in water for 24 hours, dilute 1:20 for root drench; discard solid peels to avoid pest attraction
Pruning
  • Deadhead spent blooms regularly to encourage continuous flowering through the season
  • Cut back foliage to ground level after the first hard frost in autumn to prepare for winter dormancy
  • Thin crowded stems in early spring to improve airflow and reduce powdery mildew risk
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA confirmed non-toxic; no risk of poisoning for cats

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

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Garden Uses & Culture

Culture: Symbolizes harmony, sweet memories, and unity in floral language

Usage: Ornamental garden plant; cut flower arrangements for indoor displays