Willow-leaved Spiraea (Spiraea salicifolia)

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Sunlight Full sun to partial shade; produces the most abundant blooms in full sun exposure

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Watering Water deeply when the top 2–3 cm of soil dries out; tolerates brief drought once established

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Temperature Extremely cold-hardy; withstands harsh winter temperatures and warm summer heat

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Leaf: Narrow lance-shaped leaves with serrated margins; bright green foliage turns yellow in autumn
Flower: Dense upright terminal panicles of tiny white or pale pink star-shaped blooms
Stem: Slender woody stems with smooth light brown bark

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Watering

Keep soil evenly moist during active growth; avoid waterlogging

Fertilization

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

Eggshell powder topdress：Crush dried eggshells into fine powder; sprinkle 1–2 tbsp around the base of the shrub and water in to release nutrients

Pruning

Prune immediately after flowering to remove spent blooms and encourage new growth for next year's flowers
Cut back dead or damaged wood in late winter to maintain plant health
Thin overcrowded branches to improve airflow and light penetration

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Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA confirmed non-toxic; no harmful effects for cats

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

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Culture: Symbolizes purity and simplicity in traditional European garden design

Usage: Ornamental garden shrub for borders, hedges, and mass plantings