Spirea care — light, water, toxicity and hardiness
Spirea (Spiraea japonica) wants full sun and a drink about every 7 days once established. It is hardy in USDA zones 4 to 8. It is safe to have around pets.
| scientific name | Spiraea japonica |
|---|---|
| family | Rosaceae |
| category | shrub |
| plant type | perennial |
| light | full sun |
| water cadence days | 7 |
| min zone | 4 |
| max zone | 8 |
| frost tolerant | true |
| toxic to pets | false |
| edible | false |
How often should I water Spirea?
Water during dry spells; otherwise undemanding.
Who eats it
Palatable to browsing animals such as deer: low. Palatable to people: no.
What it needs
Its shade tolerance is medium. Its moisture use is medium. Its drought tolerance is medium. It wants at least about 35 inches of rain a year. Above roughly 60 inches of annual rain it struggles. It tolerates soil down to pH 5.0. It tolerates soil up to pH 6.8. Its fertility requirement is medium. Adapted to coarse, sandy soils: yes. Adapted to medium, loamy soils: yes. Adapted to fine, clay soils: yes. It needs at least 145 frost-free days. Its fire tolerance is medium. Fire resistant: no. It has been recorded down to -23°F. It suppresses neighbours chemically: no.
How it grows
It grows as a multiple stem form. Its growth rate is moderate. Its lifespan is moderate. It puts on most of its growth in spring and summer. It resprouts after damage: yes. Coppices: no. Its tolerance of hedging is medium. At maturity it reaches about 2.0 feet. By twenty years it is about 2 feet. Its roots go down at least 14 inches. Its shape is semi-erect. It holds its leaves through winter: no.
What it looks like
It blooms in fall. The flowers are red. Conspicuous in flower: yes. The foliage is red. The foliage texture is fine. In summer the canopy is dense in porosity. In winter it is moderate in porosity. Fall colour: yes. The fruit or seed is brown. Fruit begins in fall. Fruit finishes by winter. The fruit persists on the plant: no. The fruit is conspicuous: no.
Growing more of it
Propagated by seed: yes. Propagated by cuttings: no. Propagated by container: yes. Propagated by bare root: yes. Propagated by bulb: no. Propagated by corm: no. Propagated by tubers: no. Cold stratification required: no. Commercial availability: routinely available.
Source: USDA PLANTS Database; US Cooperative Extension horticulture publications · ASPCA Toxic and Non-Toxic Plant List · 2026-09-02