When to plant cardoon in Delaware
Delaware spans USDA zones 7a–7b, so the right time to plant cardoon shifts by weeks across the state. The window to transplant seedlings outdoors runs from about April 4 in Dover to April 11 in Milford — below are local dates for 11 cities, each computed from its own frost dates.
| City | Zone | Last frost | First frost | Transplant out |
|---|---|---|---|---|
| Wilmington | 7b | April 7 | November 4 | April 7 – April 21 |
| Dover | 7b | April 4 | November 4 | April 4 – April 18 |
| Newark | 7b | April 7 | November 2 | April 7 – April 21 |
| Middletown | 7b | April 7 | November 2 | April 7 – April 21 |
| Bear | 7b | April 7 | November 2 | April 7 – April 21 |
| Glasgow | 7b | April 7 | November 2 | April 7 – April 21 |
| Brookside | 7b | April 7 | November 2 | April 7 – April 21 |
| Hockessin | 7a | April 7 | November 4 | April 7 – April 21 |
Cardoon in Delaware: FAQ
When can I plant cardoon in Delaware?
Across Delaware, the time to transplant cardoon spans roughly April 4 in Dover to April 11 in Milford, each following that city's local frost dates.
Does the cardoon planting date vary across Delaware?
Yes. Delaware publishes 11 cities with their own frost dates, so the right cardoon planting window shifts by weeks between the warmest and coldest parts of the state — use your city's page for the exact dates.
How long does cardoon take to grow in Delaware?
Cardoon takes about 120–150 days to reach harvest once planted — check that this fits inside your city's frost-free season on its place page.
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