Growing Rosemary: A Complete Profile
By Growing Home Greens Team · July 18, 2026
Rosemary is a woody Mediterranean shrub, not a tender annual herb. Treat it more like a small perennial landscape plant than something you replant every spring. In the right climate, one plant can keep producing for years.
Slow to germinate, which is why most start from a cutting
Rosemary is perennial in zones 4-11, though what that means varies a lot by zone: in milder climates it grows into a substantial woody shrub that survives winter outdoors, while in colder zones it needs either a sheltered spot, heavy winter mulch, or bringing indoors as a container plant to survive the cold months. Start seed indoors around 10 weeks before your last frost. Germination is slow and can be uneven, which is why many gardeners start rosemary from a nursery cutting instead. Established plants prefer to dry out between waterings; rosemary is far more likely to suffer from overwatering than drought.
Yellowing needles mean drainage, not nutrients
Yellowing or dropping needles are usually a drainage problem, not a nutrient one. Rosemary in heavy, wet soil struggles even when everything else about its care is right. In colder zones, winterkill is the most common way gardeners lose an otherwise-healthy plant; a hardier cultivar and a wind-sheltered spot both help.
A permanent neighbor for the brassicas
Rosemary’s scent is a documented deterrent for cabbage moths, making it a useful neighbor for brassicas. See the full companion guide for rosemary. Because it’s a long-lived perennial rather than a seasonal crop, give it a permanent spot in the Garden Designer, at 1 plant per square foot it doesn’t need much room, but it shouldn’t be planned around like an annual that rotates out each year.
Companion planting guide for Rosemary · Find your planting dates
Typically viable in USDA zones 4-11. Not sure your zone? Look it up by ZIP code.
Method: Start indoors: Start indoors from seed, then transplant outside. Rosemary needs a head start most zones can't give it by direct-sowing alone.
See exact start-indoors, direct-sow, and harvest dates for your zone →
How many Rosemary plants fit per square foot?
Spacing: 1 per square foot (square-foot-gardening spacing). Mature height: 2-4 ft.
Varieties worth considering
- 'Arp': NC State Extension's Plant Toolbox lists 'Arp' among rosemary cultivars as the hardiest, with bright blue flowers and growth up to 4 feet, the variety to look for if you're pushing rosemary's cold limits outdoors. (source)
- 'Tuscan Blue': NC State lists deep blue-violet flowers, reddish stems and fast growth on this cultivar, introduced from Tuscany before 1948. Less cold-hardy than Arp, so treat it as the pick for a mild-winter garden rather than one pushing zone limits. (source)
- 'Salem': A smaller, upright cultivar NC State lists at 24-36 inches with pale blue flowers, more compact than Tuscan Blue's rangier habit. A better fit for a square-foot bed than a cultivar bred to sprawl into a 4-7 foot shrub. (source)
- Trailing rosemary (Prostratus Group) (best for: groundcover, containers): Gardening Know How describes arching stems reaching 3 feet tall but spreading 4-8 feet wide, a groundcover habit unlike Arp, Tuscan Blue or Salem's upright shrub forms. Still culinary-grade leaves, but grown for spilling over a wall or container edge rather than as a kitchen hedge, and hardy only to zone 8. (source)
Cited from the source shown next to each variety. We haven't grown these ourselves yet, so treat this as a research-backed starting point, not a personal endorsement.
Where to buy rosemary seeds
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See it growing
Search YouTube for "growing rosemary" videos → (a live search, not a hand-picked video; results vary and aren't vetted by us)
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Growing Rosemary: A woody Mediterranean perennial that comes back year after year in mild climates but needs winter protection or containers everywhere colder.
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