Hyssop in Zone 6a & 6b
Hyssopus officinalis
Yes, hyssop grows in zones 6a and 6b. Start seeds indoors Feb 28–Mar 7 and plant out May 2–May 9.
When to plant hyssop in zone 6b
Zones 6a and 6b share the same average frost dates, so this page covers both.
Method: Either: Start indoors for an earlier harvest, or direct-sow outside for less fuss. Either works.
| Start indoors | Feb 28–Mar 7 |
|---|---|
| Direct sow / transplant outside | May 2–May 9 |
| Estimated harvest | Jul 26–Aug 2 (~85 days after planting) |
Spacing: 1 per square foot (square-foot-gardening spacing). Mature height: 1.5-2 ft.
Plant alongside it in zone 6b
These go outside within two weeks of hyssop in zone 6b, so one planting day can cover them.
- BasilMay 9–May 16
- BorageApr 25–May 2
- RosemaryMay 9–May 16
- DillApr 18–Apr 25
- CatmintMay 2–May 9
- Citronella Plant (Mosquito Plant)May 2–May 9
Hyssop is a woody, semi-evergreen perennial in the mint family with a strong, minty-bitter flavor that's historically shown up more in liqueurs like Chartreuse and in potpourri than in everyday cooking. It's grown as much for its spikes of blue flowers and the bees they attract as for any culinary use.
How hyssop fits zone 6's season
Zone 6b's frost-free window runs about 173 days, from April 25 to October 15. Hyssop needs about 85 days from sowing to first harvest.
Hyssop planting windows in every zone
Zone 6b is highlighted. Useful for comparing against a neighbouring zone, or for a garden somewhere else.
| Zone | Start indoors | Sow or plant out | Harvest |
|---|---|---|---|
| 3a & 3b | Apr 4–Apr 11 | Jun 6–Jun 13 | Aug 30–Sep 6 |
| 4a & 4b | Mar 20–Mar 27 | May 22–May 29 | Aug 15–Aug 22 |
| 5a & 5b | Mar 15–Mar 22 | May 17–May 24 | Aug 10–Aug 17 |
| 6a & 6b (your zone) | Feb 28–Mar 7 | May 2–May 9 | Jul 26–Aug 2 |
| 7a & 7b | Feb 13–Feb 20 | Apr 17–Apr 24 | Jul 11–Jul 18 |
| 8a & 8b | Jan 28–Feb 4 | Apr 1–Apr 8 | Jun 25–Jul 2 |
| 9a & 9b | Dec 21–Dec 28 | Feb 22–Mar 1 | May 18–May 25 |
Harvest dates are about 85 days after the sow or plant-out date, not after starting seeds indoors.
Good companions
- Cabbage: Penn State Extension's herb-companion roundup lists hyssop as a traditional cole-crop companion, without describing a specific tested mechanism the way it does for basil/tomato or thyme/cole-crop pairings on the same page. Treat this as extension-repeated garden tradition, not a measured result.
Where to buy hyssop seeds
Botanical Interests · True Leaf Market (each supplier's hyssop seeds)
See why we recommend these suppliers →
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See it growing
Search YouTube for "growing hyssop" videos → (a live search, not a hand-picked video; results vary and aren't vetted by us)
← Back to the full zone 6b calendar · Plan your beds in the Garden Designer →
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Growing Hyssop in USDA zone 6b: when to start seeds indoors, when to direct-sow, and when to expect a harvest.
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