Nippon Spirea (Spiraea nipponica)

Nippon Spirea

Spiraea nipponica

Clusters of white blooms blanket its arching branches in late spring. Deciduous flowering shrub; common name: Nippon spirea.

Full sun
1–2/week
Beginner
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Plant Needs

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Sunlight Full sun to partial shade; full sun exposure promotes the heaviest flowering display
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Watering Water deeply when the top 5 cm of soil feels dry; avoid prolonged waterlogging to prevent root rot
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Temperature Extremely cold-hardy; tolerates hot summer temperatures with consistent soil moisture
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Characteristics

  • Leaf: Small, oval to lanceolate, dark green with serrated margins; turns bronze in autumn
  • Flower: Dense, flat-topped clusters of tiny, fragrant white blooms
  • Stem: Slender, arching branches with brownish-grey, smooth bark
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Care Guide

Watering

Keep soil consistently moist during active growth and flowering

Fertilization

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

Eggshell powder topdressing:Crush clean, dried eggshells into fine powder; sprinkle 1 tbsp per plant in early spring and work lightly into topsoil to avoid root disturbance
Pruning
  • Prune immediately after flowering to remove spent bloom clusters and maintain a compact, rounded shape
  • Thin overcrowded inner branches to improve airflow and light penetration
  • Remove dead, damaged, or diseased stems in late winter before new growth emerges
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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: N/A

Usage: Ornamental garden shrub; ideal for border plantings, mass displays, or foundation plantings