When to plant Nasturtium in Zone 4a
In Zone 4a, Nasturtium: direct sow outdoors around May 15–May 29. Expect to harvest around Jul 9–Jul 23.
| Step | When |
|---|---|
| Direct sow outdoors | May 15 – May 29 |
| Harvest | Jul 9 – Jul 23 |
Tip: Edible flowers and leaves; direct-sow the large seeds where they're to grow — it resents transplanting.
Zone 4a averages a last spring frost around May 15 and a first fall frost around Sep 18. These are zone averages — look up your ZIP for your exact area.
See the full Zone 4a calendar in the tool →