Horehound in Zone 9a & 9b
Marrubium vulgare
Yes, horehound grows in zones 9a and 9b and comes back each year. Plant it outside Feb 1–Feb 8.
When to plant horehound in zone 9b
Zones 9a and 9b 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 | Feb 1–Feb 8 |
| Estimated harvest | First real harvest the season after planting |
Spacing: 1 per square foot (square-foot-gardening spacing). Mature height: 1-2 ft.
Before you plant: Horehound has a winter-hardiness note for zone 9b. See the details below.
Plant alongside it in zone 9b
These go outside within two weeks of horehound in zone 9b, so one planting day can cover them.
- DillFeb 8–Feb 15
- BorageFeb 15–Feb 22
- ChervilFeb 1–Feb 8
- ChivesFeb 1–Feb 8
- Milk ThistleFeb 1–Feb 8
- ParsleyFeb 1–Feb 8
Horehound is a grey-green, woolly-leaved mint relative grown for a bitterness that mostly appears in throat lozenges.
How horehound fits zone 9's season
Zone 9b's frost-free window runs about 293 days, from February 15 to December 5. Horehound takes about 1 growing season to reach first worthwhile harvest, so what matters here is how many of these seasons it gets, not whether one is long enough.
Horehound is hardy in zones 3-9, so in zone 9b it stays in the ground through winter and comes back rather than being replanted. Allow about 1.5 ft of spread at maturity.
Horehound planting windows in every zone
Zone 9b 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 | Not usually | May 16–May 23 | First real harvest the season after planting |
| 4a & 4b | Not usually | May 1–May 8 | First real harvest the season after planting |
| 5a & 5b | Not usually | Apr 26–May 3 | First real harvest the season after planting |
| 6a & 6b | Not usually | Apr 11–Apr 18 | First real harvest the season after planting |
| 7a & 7b | Not usually | Mar 27–Apr 3 | First real harvest the season after planting |
| 8a & 8b | Not usually | Mar 11–Mar 18 | First real harvest the season after planting |
| 9a & 9b (your zone) | Not usually | Feb 1–Feb 8 | First real harvest the season after planting |
Good companions
No well-established companions for horehound.
Where to buy horehound seeds
True Leaf Market (each supplier's horehound seeds)
See why we recommend these suppliers →
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See it growing
Search YouTube for "growing horehound" videos → (a live search, not a hand-picked video; results vary and aren't vetted by us)
← Back to the full zone 9b calendar · Plan your beds in the Garden Designer →
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Growing Horehound in USDA zone 9b: when to start seeds indoors, when to direct-sow, and when to expect a harvest.
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