American Ginseng in Zone 4a & 4b
Panax quinquefolius
Yes, American ginseng grows in zones 4a and 4b. Plant it outside May 15–May 22.
When to plant American ginseng in zone 4b
Zones 4a and 4b share the same average frost dates, so this page covers both.
Method: Direct sow: Direct-sow outside. It doesn't transplant well, or doesn't need the extra time indoors.
| Start indoors | Not typically started indoors |
|---|---|
| Direct sow / transplant outside | May 15–May 22 |
| Estimated harvest | About 3 years after planting |
Spacing: 4 per square foot (square-foot-gardening spacing). Mature height: 0.5-1.5 ft.
Plant alongside it in zone 4b
These go outside within two weeks of American ginseng in zone 4b, so one planting day can cover them.
- BasilMay 29–Jun 5
- BorageMay 15–May 22
- DillMay 8–May 15
- RosemaryMay 29–Jun 5
- AniseMay 15–May 22
- CatnipMay 15–May 22
American ginseng is a slow woodland perennial, taking 180-plus days just to germinate and several years more before the root is worth digging.
How American ginseng fits zone 4's season
Zone 4b's frost-free window runs about 128 days, from May 15 to September 20. American ginseng takes about 3 years from planting to first harvest, so it spans more than one growing season.
American Ginseng planting windows in every zone
Zone 4b is highlighted. Useful for comparing against a neighbouring zone, or for a garden somewhere else.
| Zone | Start indoors | Sow or plant out | Harvest |
|---|---|---|---|
| 4a & 4b (your zone) | Not usually | May 15–May 22 | About 3 years after planting |
| 5a & 5b | Not usually | May 10–May 17 | About 3 years after planting |
| 6a & 6b | Not usually | Apr 25–May 2 | About 3 years after planting |
| 7a & 7b | Not usually | Apr 10–Apr 17 | About 3 years after planting |
| 8a & 8b | Not usually | Mar 25–Apr 1 | About 3 years after planting |
Good companions
No well-established companions for American ginseng.
Where to buy American ginseng seeds
None of the seed suppliers we list carries American ginseng seeds right now. A local garden center or a specialty seed house is the place to look.
See why we recommend these suppliers →
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See it growing
Search YouTube for "growing American ginseng" videos → (a live search, not a hand-picked video; results vary and aren't vetted by us)
← Back to the full zone 4b calendar · Plan your beds in the Garden Designer →
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Growing American Ginseng in USDA zone 4b: when to start seeds indoors, when to direct-sow, and when to expect a harvest.
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