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Astilbe

Use our zone-based planting guide to know when to plant astilbe.

Plant name Zone Start seeds indoors (spring/fall) Start seeds outdoors (spring/fall) Plant seedlings/transplants outdoors (spring/fall) Plant spacing # plants per person
Astilbe 3a Not recommended Not recommended On/around May 15 (after last frost); July 15-Aug. 1 6-24 inches (depending on variety) n/a
Astilbe 3b Not recommended Not recommended On/around May 15 (after last frost); July 15-Aug. 1 6-24 inches (depending on variety) n/a
Astilbe 4a Not recommended Not recommended On/around May 15 (after last frost); July 15-Aug. 1 6-24 inches (depending on variety) n/a
Astilbe 4b Not recommended Not recommended On/around May 15 (after last frost); July 15-Aug. 1 6-24 inches (depending on variety) n/a
Astilbe 5a Not recommended Not recommended On/around April 15 (after last frost); Aug. 15-Sept. 1 6-24 inches (depending on variety) n/a
Astilbe 5b Not recommended Not recommended On/around April 15 (after last frost); Aug. 15-Sept. 1 6-24 inches (depending on variety) n/a
Astilbe 6a Not recommended Not recommended On/around April 15 (after last frost); Aug. 15-Sept. 1 6-24 inches (depending on variety) n/a
Astilbe 6b Not recommended Not recommended On/around April 15 (after last frost); Aug. 15-Sept. 1 6-24 inches (depending on variety) n/a
Astilbe 7a Not recommended Not recommended On/around April 15 (after last frost); Aug. 15-Sept. 1 6-24 inches (depending on variety) n/a
Astilbe 7b Not recommended Not recommended On/around April 15 (after last frost); Aug. 15-Sept. 1 6-24 inches (depending on variety) n/a
Astilbe 8a Not recommended Not recommended Oct. 15-March 30 6-24 inches (depending on variety) n/a
Astilbe 8b Not recommended Not recommended Oct. 15-March 30 6-24 inches (depending on variety) n/a
Astilbe 9a Not recommended Not recommended Oct. 15-March 1 6-24 inches (depending on variety) n/a
Astilbe 9b Not recommended Not recommended Oct. 15-March 1 6-24 inches (depending on variety) n/a
Astilbe 10a Not recommended Not recommended Nov. 1-March 30 6-24 inches (depending on variety) n/a
Astilbe 10b Not recommended Not recommended Nov. 1-March 30 6-24 inches (depending on variety) n/a
Astilbe 11a Not recommended Not recommended Nov. 1-March 30 6-24 inches (depending on variety) n/a
Astilbe 11b Not recommended Not recommended Nov. 1-March 30 6-24 inches (depending on variety) n/a

* Grows as a perennial in Zones 3-9; plant as a cool-season annual in warm climates. Plant outside in the spring after the last frost, or 6-8 weeks before the first frost in the fall.