Japanese Spiraea (Spiraea japonica)

Japanese Spiraea

Spiraea japonica

Lacy pink blooms cloud summer borders with soft, cheerful color. Deciduous flowering shrub; common name: Japanese meadowsweet.

Full sun
1–2/week
Beginner
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Plant Needs

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Sunlight Full sun to partial shade; full sun promotes maximum flowering, partial shade tolerable in hot climates
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Watering Water deeply when top 2–3 cm of soil is dry; avoid overwatering to prevent root rot
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Temperature Hardy to -30°C; tolerates hot summer temperatures up to 35°C with adequate moisture
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Characteristics

  • Leaf: Simple, ovate to lanceolate leaves with serrated margins; dark green turning reddish-purple in autumn
  • Flower: Dense, flat-topped corymbs of tiny pink or white blooms
  • Stem: Slender, upright to arching woody stems; brownish-gray bark
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Care Guide

Watering

Keep soil consistently moist during active growth; water deeply during dry spells

Fertilization

Apply balanced slow-release fertilizer once in early spring. Use diluted, organic feeds to avoid excessive foliage growth over blooms

Eggshell powder topdress:Crush dried eggshells into fine powder; sprinkle lightly around base of shrub in early spring to boost soil calcium and reduce blossom end rot risk
Pruning
  • Prune immediately after flowering to encourage compact growth and rebloom
  • Remove dead, damaged, or crossing branches in late winter
  • Thin older stems every 2–3 years to promote new, vigorous growth
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: Non-toxic; no adverse effects expected if ingested

Humans: No known toxic compounds; safe for human handling and ingestion in small amounts

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Garden Uses & Culture

Culture: Symbolizes gentleness and delicate beauty in some floral traditions

Usage: Ornamental garden shrub; used in borders, hedges, and mass plantings