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Lavender companion · grow guide
Astilbe · Astilbe chinensis
Astilbe needs part shade and soil that never dries out. Dry soil is its number one enemy; give it compost, mulch, and steady water.
Check my zone & planting dates
Part shadeLight
Steady waterMoist drainage
pH 5.5–7.0Soil
Zones 4a–9bHardiness
22″ tall28″ wide
ResistantDeer · rabbits some resistance
Not known toxicPets
Huckleberry saysTell me where you grow and I’ll check if Dark Side of the Moon will thrive there.
Hardy in zones 4a–9b
Spring or early fall, while soil is cool and moist.
Your year with Dark Side of the Moon
When it arrives
Plugs are small and dry out fast. Water on arrival, keep in bright light, and harden off a week before planting. Pot plugs into 4 in pots and grow on in shade until well rooted, or plant straight into rich, moist soil. Never let plugs dry out; they crisp quickly.
Spring or early fall, while soil is cool and moist.
Set the crown so the buds sit just at to about 1 in below the soil surface. Crowns rise over time; top-dress with compost.
15-24 in depending on variety; dwarf types closer.
Rich, humusy loam · pH 5.5–7.0
Fix-it tip: Dig in plenty of compost or leaf mold to hold water. In sandy soil add extra organic matter and mulch 2-3 in. Avoid winter-soggy spots.
Part shade (tolerates full sun only with constantly moist soil; light full shade).
Afternoon shade prevents leaf scorch. A. chinensis types handle a bit more sun and dryness than A. x arendsii and A. japonica.
Don’t give up on it
A later riser. Reddish or bronze shoots appear mid to late spring, often after hostas start. Bare root plants can take 4-6 weeks to show growth.
Feed and top-dress with compost; be patient for late shoots.
Water weekly or more; keep mulch on.
Divide old clumps; mulch after the ground freezes.
Leave plumes standing or cut back; check for heaving.
First season: Keep evenly moist all first season; water 2-3 times a week in heat if soil dries.
After that: About 1 in per week; never let it dry out, especially in summer.
Feed in spring with compost or a balanced slow-release fertilizer. Astilbe is a heavy feeder; a top-dressing each spring helps.
Deadheading doesn't bring rebloom. Leave dried plumes for winter interest if you like, and cut foliage to the ground in late fall or early spring.
Every 3-4 years when the center weakens or crowns rise out of the soil. Divide in spring or early fall.
Hardy in cold climates. Mulch after the ground freezes to prevent heaving of shallow crowns.
Struggles in drought and hot sun: foliage scorches and plumes brown fast. Consistent water and afternoon shade are key.
Brown, crispy leaves in summerLikely cause: Dry soil or too much sun
What to do: Water deeply, mulch, and move to afternoon shade if it repeats.
Few or no plumesLikely cause: Too much shade, too little feed, or an old crowded clump
What to do: Give morning sun, feed in spring, and divide if crowded.
Crown sits above the soilLikely cause: Crowns naturally rise over time
What to do: Top-dress with compost or lift and replant at the proper depth.
No shoots by early MayLikely cause: Late emergence, normal
What to do: Be patient into late May before assuming loss; keep soil moist.
Brown, crispy leaf edges and plumes that brown fast mean too dry. Rotting crowns in winter mean waterlogged soil.
Not listed by ASPCA; no known toxicity reported. Discourage pets from chewing any garden plant.
Deer: resistant · Rabbits: somewhat resistant
Finnegan saysStill not sure what’s wrong? Ask Plant Health — describe it or add a photo.
Good in pots · 2 gallon+
Works in large pots in shade, but pots dry out fast. Water often and use a moisture-holding mix.
Outdoor plant
Needs winter dormancy outdoors.
Best after a cold winter
A winter rest supports good flowering the following summer.
Plugs from the tray
3–4 inch pots for 3–5 weeks, until roots hold the soil
Garden bed or a 2 gallon potTime to move up? Slide the plant out: if white roots wrap the outside of the soil, it’s ready for the next size.
Planting with lavender
Give it its own spot
Opposite needs: astilbe wants shade and constantly moist, rich soil, while lavender wants sun and dry, lean soil. Grow astilbe in a shady, moist bed elsewhere.
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