How to Grow Rosemary (and Actually Get It Through Winter)

Quick Facts About Growing Rosemary

Contents

• Which Type of Rosemary Should You Grow?
• Soil and Pot: What Rosemary Actually Needs
• Sun and Placement
• Planting Rosemary Step by Step
• Watering – Rosemary's Biggest Enemy
• Feeding
• Harvesting and Storing Rosemary
• Pruning – and Why You Should Never Cut Into Bare Wood
• Overwintering: Getting Rosemary Through Winter
• Hardiness by Zone: What's Realistic Where You Live
• Propagating Rosemary From Cuttings
• Common Rosemary Problems
• Rosemary Through the Seasons
• Common Mistakes
• Frequently Asked Questions

Which Type of Rosemary Should You Grow?

Most rosemary sold at garden centers is unnamed seedling stock, but if you come across named varieties, it's worth choosing carefully — especially if winter survival matters to you.

Upright rosemary – the standard type

Upright rosemary (Rosmarinus officinalis, sometimes reclassified as Salvia rosmarinus) is the most common form, with stiff, vertical branches that can reach 3 feet (about a meter) with age. It works well in a container or, in genuinely mild climates, planted in the ground against a sheltered, sunny wall.

Trailing rosemary

Trailing or prostrate varieties spread outward instead of growing upright, which makes them attractive in containers where the branches can cascade over the rim, or as ground cover in very mild climates. They're generally somewhat less cold-hardy than upright types.

Cold-hardy cultivars

A few named cultivars, such as 'Arp' and 'Hill Hardy', have been specifically bred for better cold tolerance and can survive a few degrees colder than standard rosemary. They still aren't reliably hardy outside zones 6–7, but they're worth seeking out if you want to attempt outdoor overwintering in a well-sheltered zone 6 microclimate.

Good to know. Not sure your plant is actually rosemary? Rub a needle-like leaf gently between your fingers. The resinous, pine-like scent with hints of citrus and eucalyptus is distinctive and quite different from thyme or lavender.

Soil and Pot: What Rosemary Actually Needs

Rosemary comes from lean, rocky Mediterranean ground and wants roughly the same conditions in a pot. Rich, moisture-retentive potting mix is close to the opposite of what it thrives in.

If you're growing other Mediterranean herbs alongside it, such as thyme or sage, they can generally share the same soil and pot type — their needs are nearly identical. Our guide to growing herbs covers other plants worth pairing with rosemary in a shared herb bed or container.

Soil

Mix regular potting soil with about a quarter sand, perlite, or fine grit to open up the structure and guarantee fast drainage. A ready-made Mediterranean or cactus-and-succulent mix also works well. If you'd rather not mix your own, ordinary potting soil is fine as long as you're extra careful never to let the pot sit in standing water.

Pot

Choose a pot with generous drainage holes, ideally unglazed terracotta or clay. The porous material breathes and lets excess moisture escape through the walls, which is a real advantage for a plant prone to root rot in damp soil. A plastic pot works too, but demands more care with watering volume.

Add an inch or two (a few centimeters) of gravel or clay pebbles at the bottom if the pot has few or small drainage holes, and make sure any saucer underneath never sits full of water.

Common mistake. Planting rosemary in rich, water-retentive potting mix "to help it grow well." The usual result is soil that holds too much moisture, which sharply raises the risk of root rot.

Sun and Placement

Rosemary wants as much sun as it can get — at least 6 hours of direct light a day, ideally more. A south-facing wall or patio that also holds warmth and blocks wind is close to an ideal summer spot.

Shade or part shade doesn't work well over time. The plant survives for a while, but grows leggy and sparse, and becomes more prone to fungal problems like powdery mildew when the air around it stays damp and still instead of dry and airy.

A spot near paving, gravel, or a sun-warmed wall is often better than it looks on paper. Stone and masonry absorb heat during the day and release it slowly overnight, giving rosemary a few extra degrees of warmth compared with open lawn or a garden bed. It's the same reason rosemary and thyme so often thrive in gravel gardens and rockeries — the microclimate there resembles the Mediterranean far more than the rest of the yard does.

Good to know. Rosemary can flower as early as February–March indoors or in very mild outdoor climates, with small blue-purple blooms that are one of the earliest nectar sources for bees emerging from winter. Our guide to bee-friendly plants covers more options that support pollinators through the season.

Planting Rosemary Step by Step

1. Choose the pot and soil mix first, following the section above. This single decision does more than anything else to determine how easy the plant is to care for later.
2. Plant at the same depth it was growing in its nursery pot. Planting too deep raises the risk of stem rot at the soil line.
3. Water in thoroughly once. This helps the roots make contact with the new soil. After that, let it dry out before watering again.
4. Hold off on fertilizer for the first few weeks. Let the plant settle into its new soil, especially if that soil already contains a base fertilizer charge.
5. Place it directly in a sunny, sheltered spot. Rosemary doesn't need the gradual light acclimation that shade-loving plants do.

Watering – Rosemary's Biggest Enemy

If you're used to growing moisture-loving herbs like mint, rosemary is close to the opposite. Where mint loses vigor when it dries out, overwatering is what kills most rosemary plants.

Water only once the soil feels completely dry a couple of inches down, and then water thoroughly until it runs from the drainage holes. In the ground, in a climate mild enough to grow it there, rainfall alone is usually enough without supplemental watering. In a container, that typically works out to about once a week in summer, less often in spring and fall.

Always empty the saucer after watering. Roots sitting in standing water for even a couple of hours meaningfully raises the risk of root rot, especially in a dense soil mix.

Feeding

Rosemary needs surprisingly little fertilizer. Too much, especially nitrogen-heavy feed, produces soft, watery growth that's weaker, less flavorful, and more prone to pests and disease than the plant's naturally compact habit.

A light feed with a balanced liquid fertilizer once or twice in early summer is plenty for most container plants. In the ground, in a mild enough climate, established rosemary needs essentially no fertilizer at all.

If you've recently repotted or planted in fresh soil, skip fertilizer entirely for the first year. Fresh potting mix usually holds enough nutrients for a full season of growth on its own, and adding more on top just risks pushing that soft, weak growth that makes the plant more vulnerable to both pests and winter cold.

Harvesting and Storing Rosemary

Rosemary can be harvested year-round as long as the plant is healthy, unlike most culinary herbs that lose flavor or die back in winter. Snip sprigs as needed, ideally in the morning when the essential oils are most concentrated.

If you want to save a larger batch, rosemary dries unusually well compared with softer herbs like mint or basil, thanks to its low moisture content. Hang sprigs in small bundles somewhere dark and well ventilated for one to two weeks until the leaves are crisp, then store them whole or lightly crumbled in an airtight jar. Dried rosemary holds its aroma noticeably longer than most other dried herbs, often over a year.

Pruning – and Why You Should Never Cut Into Bare Wood

Regular light pruning keeps rosemary compact and stops it from getting sparse and leggy in the middle. Pinch or snip the growing tips throughout the season, both to shape the plant and to keep a steady supply of fresh sprigs for the kitchen.

The most important rule is to never cut into old, bare, leafless wood. Unlike many shrubby plants, rosemary rarely resprouts from older growth once the leaves are gone. Cut too hard and you can leave a branch that never greens up again. Stick to trimming the younger, leafy growth, and never remove more than about a third of the plant's volume at one time. Our general pruning guide covers the basics of clean cuts if you want a refresher on technique.

Overwintering: Getting Rosemary Through Winter

This is really the whole challenge of growing rosemary outside its native range. In its home climate it never experiences sustained hard frost in the ground, and most winters in zones 3–7 will eventually kill an unprotected plant.

Aim for a bright, cool spot, around 40–50°F (5–10°C) — an unheated but frost-free porch, a cold greenhouse, or a bright, unheated hallway all work. At that temperature the plant goes into a kind of dormancy and needs very little water, often just once a month or so.

If the plant has to live somewhere warmer, in an ordinary heated room, care actually gets harder rather than easier. Dry indoor air combined with weak winter light stresses the plant, makes it more prone to spider mites, and encourages needle drop. A warm room therefore demands more light, closer attention to humidity, and more careful watering than a cool spot does — the opposite of what most people assume.

Common mistake. Bringing rosemary into a warm, dim living room and watering it about as often as an ordinary houseplant. That combination of warmth, low light, and too much water is close to a guaranteed path to root rot or a serious spider mite infestation by late winter.

Hardiness by Zone: What's Realistic Where You Live

Rosemary's cold tolerance varies with variety, microclimate, and how any given winter plays out — but the zone map gives a realistic sense of what to expect.

Propagating Rosemary From Cuttings

Rosemary is easiest to propagate from cuttings rather than seed, which germinates slowly and unevenly. Snip a 4–6 in (10–15 cm) semi-hardwood shoot tip in late spring or early summer, strip the lower needles, and place the cutting in moist, well-drained propagation mix or a sand-and-soil blend.

Keep the mix lightly moist but never soggy while it roots, which usually takes a few weeks in a warm, bright spot. Our guide to taking cuttings covers the technique in more detail, and the core principles apply regardless of the plant.

An alternative for a plant with long, flexible branches is layering. Bend a branch down to the soil, gently scrape away the bark where it touches the ground, cover that section with soil, and keep it lightly moist. After a couple of months it usually has its own roots and can be cut free from the parent plant as an already well-established young plant — often a more forgiving method than loose cuttings for a first-time propagator.

Rosemary Through the Seasons

Care follows clear seasonal phases rather than staying the same year-round. This overview assumes a typical year in USDA zones 4–6 for a container-grown plant.

Common Mistakes

• Watering too often. By far the most common cause of death. Let the soil dry out thoroughly between waterings.
• Planting in rich, water-retentive soil. Holds too much moisture around the roots. Always mix in sand or perlite for better drainage.
• Cutting into bare, leafless wood. The branch rarely resprouts there. Stick to trimming younger, leafy growth.
• Overwintering in a warm, dim room. Raises the risk of both spider mites and weak, leggy growth. Aim for bright and cool instead.
• Fertilizing too much. Produces soft, weak growth instead of rosemary's naturally compact habit.
• Waiting too long to bring it indoors in fall. A single hard frost can damage or kill a plant that would otherwise have survived the winter indoors just fine.

Frequently Asked Questions

Can rosemary survive outdoors year-round in a cold climate?
In most of USDA zones 3–7, no. Rosemary is only reliably hardy in zones 8–10, and even a sheltered zone 6–7 spot can lose the plant in a hard winter. Most gardeners in colder zones grow rosemary in a container and bring it indoors for winter.

Why is my rosemary dying even though I water it regularly?
Overwatering, not underwatering, is the more likely culprit. Rosemary wants the soil to go nearly completely dry between waterings. Check the drainage and let the soil dry out considerably more before watering again.

What temperature should rosemary overwinter at?
Ideally 40–50°F (5–10°C) in a bright space, such as an unheated porch or a cold greenhouse. An ordinary heated room works less well, since the combination of warmth and weak winter light leaves the plant stressed and more prone to spider mites.

Can I cut a leggy, overgrown rosemary back hard to rejuvenate it?
That's not recommended. Rosemary rarely resprouts from old, leafless wood, so a hard cutback can leave bare branches that never green up again. Instead, prune lightly and regularly in the younger growth to keep the plant compact from the start.

How often should potted rosemary be watered?
Usually about once a week in summer, but always water based on how dry the soil actually feels rather than a fixed schedule. During winter dormancy, once a month or so is often enough.

What's the easiest way to propagate rosemary?
From cuttings. Snip a 4–6 in (10–15 cm) shoot tip in late spring or early summer, strip the lower needles, and place it in moist, well-drained soil. Roots typically form within a few weeks.

Why is my rosemary getting sparse and leggy in the middle?
Usually too little light or not enough pruning. Rosemary that isn't trimmed regularly tends to grow long and sparse rather than dense and compact. Move it somewhere sunnier and start pinching the growing tips regularly.

Is rosemary the same as lavender or thyme?
No, they're three different plants, even though all three are Mediterranean herbs with similar needs for sun and sharply drained soil. Rosemary has a resinous, pine-like scent and narrower, stiffer needles than either lavender or thyme.

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