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Spiraea japonica

Japanese Meadowsweet · Japanese Spiraea · Fortune Meadowsweet

Family RosaceaeGenus Spiraea

Flat pink flower heads on upright leafy stems, some still in tight bud, against a pale wall.
FlowerPaul HermansCC BY-SA 3.0

About the plant

What it is and where it grows — not part of any germination protocol.

The plant

Habit
shrubPlants of the World Online
Habit
Perennial, ShrubPLANTS Database
Height
4-6 ft1.2-1.8 mExtension Gardener Plant Toolbox
Spread
4-7 ft1.2-2.1 mExtension Gardener Plant Toolbox
Flower
PinkExtension Gardener Plant Toolbox
Blooms
Spring, SummerExtension Gardener Plant Toolbox
Native range
China North-Central, China South-Central, China Southeast, Japan, Myanmar, Taiwan and elsewhereGBIF Backbone Taxonomy
Hardiness zones
3-8Extension Gardener Plant Toolbox

Growing conditions

Sun
Full sun; Partial ShadeExtension Gardener Plant Toolbox
Soil
Clay, High Organic Matter, Loam (Silt), Shallow RockyExtension Gardener Plant Toolbox
Soil pH
Alkaline (>8.0)Extension Gardener Plant Toolbox
Moisture
Good DrainageExtension Gardener Plant Toolbox
Watering
Drought tolerance: MediumPLANTS Database

Toxicity is noted only where a source states it. No note here is not a finding of safety.

Sources: Plants of the World Online — Royal Botanic Gardens, Kew; PLANTS Database — USDA NRCS; Extension Gardener Plant Toolbox — NC State Extension; GBIF Backbone Taxonomy — Global Biodiversity Information Facility.

Worth knowing

Protocol

DerivedN. C. Deno, 1993

Difficulty Low Rated by us, not by the source.

  1. Sow and cover

    Temperature: 70°F 21°C Light: light

No stated waiting before sowing. Then 21 days to germinate.

100% germination in 21 days.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Spiraea p. 217Public domain
Show the original text
Spiraea (Rosaceae). Some required light. S. japonica requires light for germination. Fresh seed or seed DS 6 m at 70 germ. 70L(100% in 3rd w),70D(none), 40-70L(t00% in 1-3 w), and 40-70D(nQne). Seed DS 6 m at 70 germ. in the same pattern, but the percentages were much lower.
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Spiraea p. 217. Quoted exactly. Every value on this card comes from this record, except the difficulty rating, which is ours; the step names come from a fixed list.

How each step is done, in Deno’s words, and what Verified and Derived mean.

Germination trials

Readers’ own records of sowing this species, published after review. Share your trial · All trials

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