Plant name | Zone | Start seeds indoors | Start seeds outdoors | Plant seedlings/transplants outdoors | Plant spacing | # plants per person |
Celery | 3a | March 1-15 | Not recommended | On/around May 15 (after last frost) | 12-18 inches | 5 |
Celery | 3b | March 1-15 | Not recommended | On/around May 15 (after last frost) | 12-18 inches | 5 |
Celery | 4a | March 1-15 | Not recommended | On/around May 15 (after last frost) | 12-18 inches | 5 |
Celery | 4b | March 1-15 | Not recommended | On/around May 15 (after last frost) | 12-18 inches | 5 |
Celery | 5a | Feb. 1-15 | Not recommended | On/around April 15 (after last frost) | 12-18 inches | 5 |
Celery | 5b | Feb. 1-15 | Not recommended | On/around April 15 (after last frost) | 12-18 inches | 5 |
Celery | 6a | Feb. 1-15 | Not recommended | On/around April 15 (after last frost) | 12-18 inches | 5 |
Celery | 6b | Feb. 1-15 | Not recommended | On/around April 15 (after last frost) | 12-18 inches | 5 |
Celery | 7a | Feb. 1-15 | Not recommended | On/around April 15 (after last frost) | 12-18 inches | 5 |
Celery | 7b | Feb. 1-15 | Not recommended | On/around April 15 (after last frost) | 12-18 inches | 5 |
Celery | 8a | Jan. 1-15 | Not recommended | On/around March 15 (after last frost) | 12-18 inches | 5 |
Celery | 8b | Jan. 1-15 | Not recommended | On/around March 15 (after last frost) | 12-18 inches | 5 |
Celery | 9a | Dec. 1-15 | Not recommended | On/around Feb. 15 (after last frost) | 12-18 inches | 5 |
Celery | 9b | Dec. 1-15 | Not recommended | On/around Feb. 15 (after last frost) | 12-18 inches | 5 |
Celery | 10a | Nov. 15-30 | Not recommended | On/around Jan. 30 (after last frost) | 12-18 inches | 5 |
Celery | 10b | Nov. 15-30 | Not recommended | On/around Jan. 30 (after last frost) | 12-18 inches | 5 |
Celery | 11a | September-March | September-March | September-March | 12-18 inches | 5 |
Celery | 11b | September-March | September-March | September-March | 12-18 inches | 5 |
* Celery is one of the most challenging vegetables to grow. It has a very long growing season. As such, it is not recommended to start from seed outdoors except in the warmest climates. The early jumpstart indoors is important. Start seeds indoors 8-10 weeks before the average last frost date.