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.
What to expect
Rosemary is genuinely 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.
Common problems
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.
Where this fits in your garden
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 →
Spacing: 1 per square foot (square-foot-gardening spacing).
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)
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
Some links on this page go to retailers we may eventually earn a commission from as an affiliate, at no extra cost to you. We only recommend products with a genuine consensus of positive, independent reviews — see the sources cited on each item.
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)