Plant name | Zone | Start seeds indoors (spring/fall) | Start seeds outdoors (spring/fall) | Plant seedlings/transplants outdoors (spring/fall) | Plant spacing | # plants per person |
Horseradish | 3a | Not recommended | April 15-May 1 | April 15-May 1 | 1 foot | 1 |
Horseradish | 3b | Not recommended | April 15-May 1 | April 15-May 1 | 1 foot | 1 |
Horseradish | 4a | Not recommended | April 15-May 1 | April 15-May 1 | 1 foot | 1 |
Horseradish | 4b | Not recommended | April 15-May 1 | April 15-May 1 | 1 foot | 1 |
Horseradish | 5a | Not recommended | March 15-April 1 | March 15-April 1 | 1 foot | 1 |
Horseradish | 5b | Not recommended | March 15-April 1 | March 15-April 1 | 1 foot | 1 |
Horseradish | 6a | Not recommended | March 15-April 1 | March 15-April 1 | 1 foot | 1 |
Horseradish | 6b | Not recommended | March 15-April 1 | March 15-April 1 | 1 foot | 1 |
Horseradish | 7a | Not recommended | March 15-April 1 | March 15-April 1 | 1 foot | 1 |
Horseradish | 7b | Not recommended | March 15-April 1 | March 15-April 1 | 1 foot | 1 |
Horseradish | 8a | Not recommended | Feb. 15-March 1 | Feb. 15-March 1 | 1 foot | 1 |
Horseradish | 8b | Not recommended | Feb. 15-March 1 | Feb. 15-March 1 | 1 foot | 1 |
Horseradish | 9a | Not recommended | Jan. 15-Feb. 1 | Jan. 15-Feb. 1 | 1 foot | 1 |
Horseradish | 9b | Not recommended | Jan. 15-Feb. 1 | Jan. 15-Feb. 1 | 1 foot | 1 |
Horseradish | 10a | Not recommended | Not recommended | Not recommended | Not recommended | Not recommended |
Horseradish | 10b | Not recommended | Not recommended | Not recommended | Not recommended | Not recommended |
Horseradish | 11a | Not recommended | Not recommended | Not recommended | Not recommended | Not recommended |
Horseradish | 11b | Not recommended | Not recommended | Not recommended | Not recommended | Not recommended |
* Horseradish is a cool-weather herb that grows via crowns or roots. Plant them outside 4-6 weeks before the average last frost date in your area. Not recommended in tropical climates.