Horehound in Zone 7a & 7b

Marrubium vulgare

When to plant horehound in zone 7b

Zones 7a and 7b share the same average frost dates in our data, so this page covers both.

Method: Direct sow: Direct-sow outside. Horehound doesn't transplant well, or doesn't need the extra time indoors.

Start indoors	Not typically started indoors
Direct sow / transplant outside	Mar 27–Apr 3
Estimated harvest	Mar 26 '28–Apr 2 '28 (First real harvest the season after planting)

Spacing: 1 per square foot (square-foot-gardening spacing). Mature height: 1-2 ft.

Horehound is a grey-green, woolly-leaved mint relative grown for a bitterness that mostly appears in throat lozenges.

How horehound fits zone 7's season

Zone 7b's frost-free window runs about 198 days, from April 10 to October 25. 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 7b it stays in the ground through winter and comes back rather than being replanted. Allow about 1.5 ft of spread at maturity.

Good companions

No standout companions recorded yet for Horehound.

Where to buy horehound seeds

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