When to plant Nasturtium in Zone 4b
In Zone 4b, Nasturtium: direct sow outdoors around May 10–May 24. Expect to harvest around Jul 4–Jul 18.
| Step | When |
|---|---|
| Direct sow outdoors | May 10 – May 24 |
| Harvest | Jul 4 – Jul 18 |
Tip: Edible flowers and leaves; direct-sow the large seeds where they're to grow — it resents transplanting.
Zone 4b averages a last spring frost around May 10 and a first fall frost around Sep 22. These are zone averages — look up your ZIP for your exact area.
See the full Zone 4b calendar in the tool →