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Sunflower

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

Plant name Zone Start seeds indoors (spring/fall) Start seeds outdoors (spring/fall) Plant seedlings/transplants outdoors (spring/fall) Plant spacing # plants per person
Sunflower 3a Not recommended On/around May 15 (after last frost) On/around May 15 (after last frost) 6 inches n/a
Sunflower 3b Not recommended On/around May 15 (after last frost) On/around May 15 (after last frost) 6 inches n/a
Sunflower 4a Not recommended On/around May 15 (after last frost) On/around May 15 (after last frost) 6 inches n/a
Sunflower 4b Not recommended On/around May 15 (after last frost) On/around May 15 (after last frost) 6 inches n/a
Sunflower 5a Not recommended On/around April 15 (after last frost) On/around April 15 (after last frost) 6 inches n/a
Sunflower 5b Not recommended On/around April 15 (after last frost) On/around April 15 (after last frost) 6 inches n/a
Sunflower 6a Not recommended On/around April 15 (after last frost) On/around April 15 (after last frost) 6 inches n/a
Sunflower 6b Not recommended On/around April 15 (after last frost) On/around April 15 (after last frost) 6 inches n/a
Sunflower 7a Not recommended On/around April 15 (after last frost) On/around April 15 (after last frost) 6 inches n/a
Sunflower 7b Not recommended On/around April 15 (after last frost) On/around April 15 (after last frost) 6 inches n/a
Sunflower 8a Not recommended On/around March 15 (after last frost) On/around March 15 (after last frost) 6 inches n/a
Sunflower 8b Not recommended On/around March 15 (after last frost) On/around March 15 (after last frost) 6 inches n/a
Sunflower 9a Not recommended On/around Feb. 15 (after last frost) On/around Feb. 15 (after last frost) 6 inches n/a
Sunflower 9b Not recommended On/around Feb. 15 (after last frost) On/around Feb. 15 (after last frost) 6 inches n/a
Sunflower 10a Not recommended Dec. 1-March 30 Dec. 1-March 30 6 inches n/a
Sunflower 10b Not recommended Dec. 1-March 30 Dec. 1-March 30 6 inches n/a
Sunflower 11a Not recommended Dec. 1-March 1 Dec. 1-March 1 6 inches n/a
Sunflower 11b Not recommended Dec. 1-March 1 Dec. 1-March 1 6 inches n/a

* Direct sow or transplant seeldings after the threat of frost has passed. You can continue to sow seeds every couple of weeks for a prolonged bloom.