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Plant nameZoneStart seeds indoors (spring/fall)Start seeds outdoors (spring/fall)Plant seedlings/transplants outdoors (spring/fall)Plant spacing# plants per person
Astilbe3aNot recommendedNot recommendedOn/around May 15 (after last frost); July 15-Aug. 16-24 inches (depending on variety)n/a
Astilbe3bNot recommendedNot recommendedOn/around May 15 (after last frost); July 15-Aug. 16-24 inches (depending on variety)n/a
Astilbe4aNot recommendedNot recommendedOn/around May 15 (after last frost); July 15-Aug. 16-24 inches (depending on variety)n/a
Astilbe4bNot recommendedNot recommendedOn/around May 15 (after last frost); July 15-Aug. 16-24 inches (depending on variety)n/a
Astilbe5aNot recommendedNot recommendedOn/around April 15 (after last frost); Aug. 15-Sept. 16-24 inches (depending on variety)n/a
Astilbe5bNot recommendedNot recommendedOn/around April 15 (after last frost); Aug. 15-Sept. 16-24 inches (depending on variety)n/a
Astilbe6aNot recommendedNot recommendedOn/around April 15 (after last frost); Aug. 15-Sept. 16-24 inches (depending on variety)n/a
Astilbe6bNot recommendedNot recommendedOn/around April 15 (after last frost); Aug. 15-Sept. 16-24 inches (depending on variety)n/a
Astilbe7aNot recommendedNot recommendedOn/around April 15 (after last frost); Aug. 15-Sept. 16-24 inches (depending on variety)n/a
Astilbe7bNot recommendedNot recommendedOn/around April 15 (after last frost); Aug. 15-Sept. 16-24 inches (depending on variety)n/a
Astilbe8aNot recommendedNot recommendedOct. 15-March 306-24 inches (depending on variety)n/a
Astilbe8bNot recommendedNot recommendedOct. 15-March 306-24 inches (depending on variety)n/a
Astilbe9aNot recommendedNot recommendedOct. 15-March 16-24 inches (depending on variety)n/a
Astilbe9bNot recommendedNot recommendedOct. 15-March 16-24 inches (depending on variety)n/a
Astilbe10aNot recommendedNot recommendedNov. 1-March 306-24 inches (depending on variety)n/a
Astilbe10bNot recommendedNot recommendedNov. 1-March 306-24 inches (depending on variety)n/a
Astilbe11aNot recommendedNot recommendedNov. 1-March 306-24 inches (depending on variety)n/a
Astilbe11bNot recommendedNot recommendedNov. 1-March 306-24 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.

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