Plant name | Zone | Start seeds indoors (spring/fall) | Start seeds outdoors (spring/fall) | Plant seedlings/transplants outdoors (spring/fall) | Plant spacing | # plants per person |
Cosmos | 3a | April 1-15 | On/around May 15 (after last frost) | On/around May 15 (after last frost) | 12-18 inches | n/a |
Cosmos | 3b | April 1-15 | On/around May 15 (after last frost) | On/around May 15 (after last frost) | 12-18 inches | n/a |
Cosmos | 4a | April 1-15 | On/around May 15 (after last frost) | On/around May 15 (after last frost) | 12-18 inches | n/a |
Cosmos | 4b | April 1-15 | On/around May 15 (after last frost) | On/around May 15 (after last frost) | 12-18 inches | n/a |
Cosmos | 5a | March 1-15 | On/around April 15 (after last frost) | On/around April 15 (after last frost) | 12-18 inches | n/a |
Cosmos | 5b | March 1-15 | On/around April 15 (after last frost) | On/around April 15 (after last frost) | 12-18 inches | n/a |
Cosmos | 6a | March 1-15 | On/around April 15 (after last frost) | On/around April 15 (after last frost) | 12-18 inches | n/a |
Cosmos | 6b | March 1-15 | On/around April 15 (after last frost) | On/around April 15 (after last frost) | 12-18 inches | n/a |
Cosmos | 7a | March 1-15 | On/around April 15 (after last frost) | On/around April 15 (after last frost) | 12-18 inches | n/a |
Cosmos | 7b | March 1-15 | On/around April 15 (after last frost) | On/around April 15 (after last frost) | 12-18 inches | n/a |
Cosmos | 8a | Feb. 1-15 | On/around March 15 (after last frost) | On/around March 15 (after last frost) | 12-18 inches | n/a |
Cosmos | 8b | Feb. 1-15 | On/around March 15 (after last frost) | On/around March 15 (after last frost) | 12-18 inches | n/a |
Cosmos | 9a | 4-6 weeks before planting outdoors | Jan. 15-Feb. 15; Sept. 15-Oct. 30 | Jan. 15-Feb. 15; Sept. 15-Oct. 30 | 12-18 inches | n/a |
Cosmos | 9b | 4-6 weeks before planting outdoors | Jan. 15-Feb. 15; Sept. 15-Oct. 30 | Jan. 15-Feb. 15; Sept. 15-Oct. 30 | 12-18 inches | n/a |
Cosmos | 10a | 4-6 weeks before planting outdoors | Jan. 15-March 15; Sept. 15-Oct. 30 | Jan. 15-March 15; Sept. 15-Oct. 30 | 12-18 inches | n/a |
Cosmos | 10b | 4-6 weeks before planting outdoors | Jan. 15-March 15; Sept. 15-Oct. 30 | Jan. 15-March 15; Sept. 15-Oct. 30 | 12-18 inches | n/a |
Cosmos | 11a | 4-6 weeks before planting outdoors | Jan. 15-March 15; Sept. 15-Oct. 30 | Jan. 15-March 15; Sept. 15-Oct. 30 | 12-18 inches | n/a |
Cosmos | 11b | 4-6 weeks before planting outdoors | Jan. 15-March 15; Sept. 15-Oct. 30 | Jan. 15-March 15; Sept. 15-Oct. 30 | 12-18 inches | n/a |
Cosmos
Use our zone-based planting guide to know when to plant cosmos.
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