Growing Horehound: A Complete Profile
By Growing Home Greens Team · August 20, 2026
Horehound is a grey-green, woolly-leaved mint relative grown for a bitterness that mostly appears in throat lozenges.
Deadhead it or get a patch
NC State Extension notes it can be weedy and is usually found in disturbed and overgrazed ground, spreading in pasture because livestock avoid eating it. In a garden the mechanism is seed rather than runners, which makes it easier to manage than mugwort: cut the flower heads before they set and the problem does not start.
It wants poor, dry ground
Hardy zones 3 through 9, one to two feet tall and wide, full sun to partial shade, flowering June through November. It does best in thin dry soil and rots in wet ground, which is the usual way to lose one.
Using it
The bitterness is strong and the traditional preparation pairs it with a great deal of sugar for exactly that reason. Leaves are used fresh or dried in tea and in candy. It is not a culinary herb in the way sage or thyme are; a little goes a long way.
Source: NC State Extension Gardener Plant Toolbox, Marrubium vulgare.
Companion planting guide for Horehound · Find your planting dates
Typically viable in USDA zones 3-9. Not sure your zone? Look it up by ZIP code.
Mature height: 1-2 ft
Method: Direct sow: Direct-sow outside. It doesn't transplant well, or doesn't need the extra time indoors.
When to plant horehound, by zone
Every zone horehound grows in. Pick your zone in the header and it will be highlighted here. Each zone links to its full page.
| 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 | Not usually | Feb 1–Feb 8 | First real harvest the season after planting |
See exact start-indoors, direct-sow, and harvest dates for your zone →
How many Horehound plants fit per square foot?
Spacing: 1 per square foot (square-foot-gardening spacing). Mature height: 1-2 ft.
Where to buy horehound seeds
True Leaf Market (each supplier's horehound seeds)
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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)
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Growing Horehound: The bitter herb behind old-fashioned cough drops, which seeds itself around freely if you let it.
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