Taxonomy

Division:

Magnoliophyta | - Flowering plants

Family:

Rosaceae

Genus:

Spiraea

Species:

Spiraea japonica

USDA Symbol:

SPJA

Growth Characteristics

Life Cycle:

Perennial

Growth Habit:

Shrub

Height:

180 cm

Light Requirements:

Full Sun

Drought Tolerance:

Medium

Bloom Months:

may,jun,jul,aug

Bloom Colors:

pink, white, red

Landscaping Shrub:

Yes

Keystone Species Ranking

Caterpillar Keystone:

★★★★☆ Butterfly & moth species supported by this genus (NWF)

Reported Fauna Sightings

Garden & Ecology Notes

Wildlife Value:

bees, butterflies

Deer Resistant:

Yes

Fall Color:

red, orange, bronze

Fire Ecology:

Fire adapted — tolerates or benefits from fire

Fire Notes:

Resprouts vigorously from the root crown after fire or cutting.

Soil Requirements

Soil Type:

rich, well-drained loamy soil

pH:

5.5 - 7.0 (slightly acidic to neutral)

Drainage:

excellent drainage required

Moisture:

consistently moist

Notes:

native to open, sunny areas with good soil fertility

Propagation & Germination

Stratification:

None required

Germination Time:

14–30 days

Notes:

Seeds germinate readily without pretreatment; light may improve germination rates.

The above propagation data sourced from Claude AI