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Hydrangeas

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

Plant name Zone Start seeds indoors (spring/fall) Start seeds outdoors (spring/fall) Plant seedlings/transplants outdoors (spring/fall) Plant spacing # plants per person
Hydrangeas 3a Not recommended Not recommended On/around May 15 (after last frost); Aug. 1-15 2-12 feet (depending on variety) n/a
Hydrangeas 3b Not recommended Not recommended On/around May 15 (after last frost); Aug. 1-15 2-12 feet (depending on variety) n/a
Hydrangeas 4a Not recommended Not recommended On/around May 15 (after last frost); Aug. 1-15 2-12 feet (depending on variety) n/a
Hydrangeas 4b Not recommended Not recommended On/around May 15 (after last frost); Aug. 1-15 2-12 feet (depending on variety) n/a
Hydrangeas 5a Not recommended Not recommended On/around April 15 (after last frost); Sept. 1-15 2-12 feet (depending on variety) n/a
Hydrangeas 5b Not recommended Not recommended On/around April 15 (after last frost); Sept. 1-15 2-12 feet (depending on variety) n/a
Hydrangeas 6a Not recommended Not recommended On/around April 15 (after last frost); Sept. 1-15 2-12 feet (depending on variety) n/a
Hydrangeas 6b Not recommended Not recommended On/around April 15 (after last frost); Sept. 1-15 2-12 feet (depending on variety) n/a
Hydrangeas 7a Not recommended Not recommended On/around April 15 (after last frost); Sept. 1-15 2-12 feet (depending on variety) n/a
Hydrangeas 7b Not recommended Not recommended On/around April 15 (after last frost); Sept. 1-15 2-12 feet (depending on variety) n/a
Hydrangeas 8a Not recommended Not recommended On/around March 15 (after last frost); Oct. 1-15 2-12 feet (depending on variety) n/a
Hydrangeas 8b Not recommended Not recommended On/around March 15 (after last frost); Oct. 1-15 2-12 feet (depending on variety) n/a
Hydrangeas 9a Not recommended Not recommended On/around March 15 (after last frost); Oct. 1-15 2-12 feet (depending on variety) n/a
Hydrangeas 9b Not recommended Not recommended On/around March 15 (after last frost); Oct. 1-15 2-12 feet (depending on variety) n/a
Hydrangeas 10a Not recommended Not recommended Not recommended Not recommended n/a
Hydrangeas 10b Not recommended Not recommended Not recommended Not recommended n/a
Hydrangeas 11a Not recommended Not recommended Not recommended Not recommended n/a
Hydrangeas 11b Not recommended Not recommended Not recommended Not recommended n/a

* Shrub that comes in a wide variety of sizes and colors. Plant a starter plant in spring after the last frost or in the fall before the first frost.