The Mediterranean Herb – How to Grow Rosemary

How to Grow Rosemary

Before you start growing rosemary, it’s worth gathering the right materials. I’ve found that having everything prepared makes the process considerably smoother, particularly when dealing with young plants that need quick establishment.

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Essential Materials

For starting rosemary, you’ll need quality potting compost mixed with horticultural grit or sharp sand (about one part grit to three parts compost). This creates the free-draining medium rosemary demands. I use terracotta or clay pots with drainage holes if growing in containers, as these allow moisture to evaporate through the sides. For garden planting, you’ll need a spade, garden fork, and possibly some pea gravel or horticultural grit to improve heavy soil.

Your plant material itself can come from three sources: seeds (cheapest but slowest), cuttings from existing plants (free if you know someone with established rosemary), or young plants from garden centres or nurseries. I’ve had best results with small plants or cuttings, as rosemary from seed can be painfully slow and germination rates aren’t always reliable.

Site Selection Requirements

Choosing the right location is absolutely critical. Rosemary needs at least six hours of direct sunlight daily, though it’ll tolerate partial shade in southern England. I’ve planted rosemary in both full sun and spots that get shade during the afternoon, and whilst both survived, the sunny position produced bushier growth with stronger flavour. You might also find from seed to statement piece: growing your own gourds helpful.

Wind protection matters more than many guides suggest. Whilst rosemary tolerates coastal conditions (I’ve seen magnificent specimens thriving in Cornwall and along the Sussex coast), young plants benefit from shelter during establishment. A south-facing wall provides both warmth and protection, creating a microclimate that helps borderline-hardy varieties survive our winters. Avoid frost pockets and areas where cold air settles, particularly in northern regions or exposed gardens.

Step-by-Step Instructions

Preparing Your Planting Site

Soil preparation makes the difference between thriving rosemary and struggling plants. I’ve learnt this through watching rosemary rot in my original clay-heavy borders before I understood drainage requirements. Rosemary absolutely cannot tolerate waterlogged roots, which makes our heavy clay soils and wet winters challenging.

Dig over your chosen area to at least a spade’s depth, breaking up any compacted layers. If you’ve got clay soil like I have in much of my garden, work in generous amounts of horticultural grit, sharp sand, or fine gravel. I add at least one full bucket of grit per square metre, sometimes more. Some gardeners create raised beds or mounds for rosemary, which I’ve found particularly effective in areas with poor drainage. The soil should feel gritty rather than sticky when you work it between your fingers.

pH isn’t hugely critical, but rosemary prefers neutral to slightly alkaline conditions (pH 6.0-7.5). Our naturally alkaline soils in much of southern and eastern England suit rosemary perfectly. If you’re on acidic soil, adding lime can help, though I’ve successfully grown rosemary in slightly acidic conditions without amendment.

Planting Rosemary Outdoors

Timing matters for outdoor planting. I plant rosemary in mid to late spring once the soil has warmed and the risk of hard frosts has passed, typically from April onwards depending on your region. Autumn planting can work in milder areas, but I’ve lost plants to winter wet when they haven’t had time to establish proper root systems.

Dig a hole roughly twice the width of your plant’s rootball but the same depth. Rosemary should sit at the same level it was growing in its pot, never deeper. I roughen the sides of the planting hole with a fork to help roots penetrate outward. Before planting, I water the pot thoroughly and let it drain, as this helps the rootball slide out intact.

Remove the plant gently from its pot, teasing out any circling roots at the base. Position it in the hole, backfill with your improved soil mixture, and firm gently with your hands. Water well after planting to settle the soil around roots, but then hold back on watering. This seems counterintuitive, but rosemary establishes better with modest moisture rather than constant watering.

Growing Rosemary in Containers

Container growing suits rosemary brilliantly, particularly for gardeners with heavy soil or limited space. I keep several rosemary plants in pots near my kitchen door for easy harvesting, and they’ve outlasted many of their border-planted relatives.

Choose containers at least 30cm in diameter for mature plants, though you can start smaller and pot up as they grow. Drainage is absolutely paramount. I ensure pots have multiple drainage holes and add a layer of crocks or stones at the base. Fill with a mixture of three parts multi-purpose compost to one part horticultural grit or perlite.

Plant at the same depth as before, leaving space at the top for watering. Position containers in the sunniest spot available. I move mine against the house wall during winter for extra protection, as pots expose roots to more temperature fluctuation than ground planting. Container plants need more frequent watering than garden plants during summer, but less in winter. I check by feeling the compost a few centimetres down rather than watering on a schedule.

Starting from Cuttings

Propagating rosemary from cuttings is satisfying and reliable once you’ve got the technique sorted. I take cuttings from spring through to early autumn, though I’ve had best success in late spring when plants are actively growing.

Select healthy, non-flowering shoots about 10-15cm long from the current year’s growth. These should be semi-ripe, meaning they’re not brand new soft growth but haven’t turned fully woody. I use a sharp, clean knife or secateurs to make a clean cut just below a leaf node. Strip the leaves from the lower half of the cutting, leaving foliage only at the top.

Whilst rooting hormone isn’t essential, I find it improves success rates. Dip the cut end in hormone powder, tap off excess, then insert cuttings into small pots filled with equal parts compost and grit or perlite. I usually put three or four cuttings around the edge of a 10cm pot. Water lightly and place in a bright spot out of direct sunlight. I cover pots loosely with clear plastic bags, removing them daily to prevent excessive moisture buildup.

Cuttings typically root in four to eight weeks. You’ll know they’ve taken when you see new growth or feel resistance when you gently tug the cutting. I keep newly rooted cuttings in their pots until the following spring, growing them on in a cold frame or sheltered spot before planting out.

Watering and Ongoing Care

Watering rosemary properly feels counterintuitive to many gardeners used to moist-soil plants. I’ve killed more rosemary through overwatering than drought. Established plants in the ground rarely need watering in our climate, even during dry spells. Their deep roots access moisture below the surface, and they’re adapted to survive prolonged drought.

For newly planted rosemary, I water sparingly during the first growing season, only when the top several centimetres of soil feel dry. Container plants need more attention, particularly in summer. I water thoroughly when the compost feels dry a few centimetres down, allowing excess to drain completely. In winter, I barely water pots at all, perhaps once every few weeks if they’re under shelter.

Feeding isn’t necessary for rosemary. I’ve found that plants grown in lean conditions actually develop better flavour and more concentrated oils than those given rich soil or regular fertiliser. If your plant looks pale or grows weakly, a light application of general-purpose fertiliser in spring might help, but I rarely bother.

Pruning and Maintenance

Pruning keeps rosemary bushy and productive rather than becoming leggy and bare at the base. I prune lightly but regularly rather than doing one severe cut, as rosemary doesn’t reliably regenerate from old wood like some herbs.

After flowering (usually late spring or early summer depending on variety), I trim back the flowered shoots by about a third, cutting just above a set of leaves. This encourages branching and prevents plants becoming straggly. Throughout the growing season, regular harvesting serves as pruning, so if you use rosemary frequently in cooking, you’re already doing maintenance work.

I avoid pruning after early autumn, as new growth prompted by late cutting can be damaged by frost. In spring, I remove any frost-damaged or dead shoots, cutting back to healthy wood. If an established plant has become very woody and sparse, I sometimes risk harder pruning in spring, cutting back to just above where I can see green growth, but this doesn’t always work. With very old, bare plants, taking cuttings and starting fresh often gives better results than attempting renovation.

Common Mistakes to Avoid

Overwatering and Poor Drainage

This is far and away the biggest killer of rosemary in British gardens. I’ve watched perfectly healthy-looking plants suddenly collapse and die after periods of prolonged rain in heavy soil. Rosemary roots need air as well as moisture, and waterlogged conditions cause root rot that’s almost impossible to reverse.

The warning signs include yellowing leaves, wilting despite moist soil, and a generally unhappy appearance. By the time these symptoms appear, significant root damage has often occurred. I’ve learnt to be absolutely ruthless about drainage when siting rosemary. If your soil stays wet after rain or you see standing water, either improve drainage dramatically or grow rosemary in raised beds or containers instead.

Even in containers, saucers that hold water can cause problems. I never use saucers under rosemary pots, or I empty them immediately after watering. During wet winters, I sometimes move container plants under eaves or into a cold frame to reduce rainfall exposure.

Wrong Variety for Your Climate

Not all rosemary cultivars tolerate British winters equally. I learnt this after losing a beautiful trailing variety during a cold snap that neighbouring upright plants survived easily. Rosmarinus officinalis ‘Miss Jessopp’s Upright’ and ‘Roseus’ handle our weather better than many Mediterranean selections.

Prostrate or trailing varieties like ‘Prostratus’ look lovely in containers or cascading over walls but are generally less hardy. I grow these in pots that I can move to shelter during severe weather. If you’re in northern England, Scotland, or other cold areas, choosing hardy varieties and providing winter protection becomes even more important.

I’ve seen magnificent rosemary hedges in Cornwall and Devon that wouldn’t survive a winter in Yorkshire without protection. Understanding your local microclimate and choosing accordingly prevents disappointment.

Planting Too Deep

Rosemary stems will rot if buried below their original soil level. I’ve made this mistake when planting in improved soil that settled after watering, leaving the stem base below grade. The crown (where stems meet roots) should sit at or very slightly above soil level.

When planting, I make sure the surface of the rootball is level with the surrounding soil. With container plants, I check that the rim of the pot will sit about 2cm below the compost surface to allow for watering, but the plant itself remains at its original depth.

Expert Tips

Choosing the Best Varieties

I’ve grown about a dozen different rosemary varieties over time, and certain ones consistently perform better in British conditions. ‘Miss Jessopp’s Upright’ is my top recommendation for most gardens. It grows into a tall, narrow column reaching 1.5 metres or more, tolerates our winters reliably, and has excellent flavour. I use it as an informal hedge along a path, where brushing against it releases wonderful fragrance.

For smaller spaces or containers, ‘Roseus’ offers pink flowers and good hardiness in a more compact form. If you want something different, ‘Aureus’ has golden-tinged foliage that brightens winter borders, though it’s slightly less vigorous than plain green forms. The white-flowered ‘Albus’ is lovely but can be harder to source.

I avoid overly fancy or highly bred varieties unless I’m prepared to give them extra protection. The closer to the straight species, the more reliable the plant tends to be in our variable climate.

Winter Protection Strategies

Even hardy rosemary appreciates some winter care in colder regions. I don’t wrap plants in fleece or provide elaborate protection for established specimens, but I do take some sensible precautions. Mulching around the base with gravel rather than organic material helps prevent stem rot during wet winters whilst still providing some root insulation.

For borderline-hardy varieties or young plants, positioning against a south-facing wall creates a warmer microclimate. I’ve noticed that rosemary planted near walls can be several hardiness zones tougher than the same variety in an open border. The wall radiates stored heat and provides shelter from harsh winds.

Container plants are more vulnerable because roots in pots experience greater temperature swings. I group pots together against the house wall and sometimes wrap bubble wrap around the outside of containers (not the plants themselves) during forecast cold snaps. Moving them into an unheated greenhouse or cold frame provides additional protection whilst maintaining the cold dormancy rosemary needs.

Harvesting for Best Flavour

Rosemary flavour concentrates in the aromatic oils within its leaves, and these oils are most potent just before the plant flowers. I harvest year-round as needed, but I’ve noticed that flavour is particularly strong on warm, dry mornings after the dew has evaporated but before the heat of midday.

I cut whole sprigs rather than picking individual leaves, taking stems 10-15cm long from the tips of branches. This serves as light pruning and encourages bushier growth. The woody older stems have less flavour than younger growth, so I focus on the tips.

Fresh rosemary is wonderful, but I also dry excess harvest by hanging small bundles in a warm, airy spot out of direct sun. Once completely dry (usually a week or two), I strip the leaves and store them in airtight jars. Whilst dried rosemary doesn’t match fresh for potency, having your own home-dried supply beats shop-bought every time.

Companion Planting Considerations

Rosemary works well in mixed plantings with other Mediterranean herbs and drought-tolerant plants. I grow mine alongside lavender, sage, and thyme, all of which share similar soil and water requirements. This grouping makes care straightforward, as I can treat the whole area the same way.

In vegetable gardens, rosemary is said to deter certain pests, though I’m honestly sceptical about how effective this is in practice. I do notice fewer cabbage white butterflies near my rosemary-edged beds, but whether that’s the herb or coincidence, I couldn’t say definitively. Regardless, it looks attractive and provides useful harvests, so companion planting benefits seem like a bonus rather than the main reason to grow it.

Avoid planting rosemary near moisture-loving plants with different care requirements. I made this mistake early on, positioning rosemary next to astilbes that needed regular watering. Either the rosemary got too wet or the astilbes too dry; it was impossible to satisfy both.

Frequently Asked Questions

Can rosemary survive winter outdoors in Britain?

Yes, rosemary can survive British winters in most regions when given proper conditions. Hardy varieties like ‘Miss Jessopp’s Upright’ tolerate temperatures down to around -10°C or lower when established. The key is providing excellent drainage, as rosemary survives cold better than it survives winter wet. Plants against south-facing walls or in raised beds with gritty soil fare best. In very exposed or northern gardens, container-grown rosemary that can be moved to shelter during severe weather offers more security. Young plants need more protection than established specimens, so I provide extra care during their first winter.

How often should I water rosemary plants?

Established rosemary in the ground needs virtually no watering in our climate once its roots have spread. I might water during prolonged summer drought, but otherwise, I leave it alone. Newly planted rosemary needs occasional watering during its first growing season, perhaps once weekly if there’s no rain, but far less than most garden plants. Container-grown rosemary needs more attention. I water pots thoroughly when the compost feels dry several centimetres down, which might be twice weekly in hot summer weather but only once or twice monthly in winter. The biggest mistake is overwatering. Rosemary tolerates drought far better than wet conditions, so when in doubt, wait another day or two before watering.

Why is my rosemary turning brown and dying?

Browning rosemary usually indicates either waterlogging, severe cold damage, or occasionally, old age. If the browning starts at the base and works upward with the plant becoming soft or mushy, root rot from overwatering or poor drainage is the likely culprit. This is difficult to reverse, though you might save the plant by improving drainage and cutting back on water. If browning occurs after cold weather and affects shoot tips, frost damage is responsible. Cut back to healthy growth in spring, and the plant may recover. Sometimes very old rosemary simply reaches the end of its productive life and begins dying back. In this case, taking cuttings from healthy growth and starting fresh plants is your best option rather than trying to revive the failing specimen.

Can I grow rosemary from supermarket cuttings?

You can attempt to root rosemary from shop-bought herb pots, though success varies. These plants are often forced in ideal conditions and may struggle to adapt to normal growing environments. If you want to try, select the healthiest-looking stems, take cuttings as described in my propagation section, and follow the same rooting process. I’ve had mixed results with this approach. Some cuttings root and grow well, whilst others simply fail. Starting with proper nursery plants or cuttings from garden-grown rosemary gives more reliable results, but experimenting with shop herbs costs little and occasionally works brilliantly. The key is maintaining moderate moisture without overwatering during the rooting period.

How long does rosemary take to grow to full size?

Rosemary is moderately slow-growing compared to annual herbs. A small nursery plant typically takes two to three years to develop into a substantial bush 60-90cm tall, depending on variety and growing conditions. Upright varieties eventually reach 1.5 metres or more, but this takes four or five years from a young plant. Container-grown rosemary stays smaller than garden specimens due to root restriction. You can begin harvesting lightly as soon as plants are established, even in their first season, though I wait until they’ve put on decent growth before taking much. Rosemary grown from seed is particularly slow, taking a full year or more just to reach the size of a small nursery plant. This is why I generally recommend starting with young plants or cuttings rather than seeds for quicker results.

Should I bring rosemary indoors for winter?

Generally, no. Rosemary isn’t a houseplant and struggles indoors with low light and warm, dry air from central heating. I’ve tried overwintering rosemary on sunny windowsills, and whilst plants survive, they become leggy and weak, often developing powdery mildew or spider mite problems. Hardy varieties are better left outdoors where they experience natural dormancy. If you have tender varieties or young plants you’re worried about, an unheated greenhouse, cold frame, or sheltered porch works better than bringing them into heated rooms. These spaces provide frost protection whilst maintaining the cool conditions rosemary needs during winter. Container plants can be moved against house walls under eaves for extra protection whilst remaining outdoors. The exception might be if you have a very bright, cool conservatory or porch that stays closer to outdoor temperatures.

Why we Love Rosemary

Growing rosemary successfully in British gardens comes down to understanding its Mediterranean origins and adapting your approach accordingly. The free-draining soil, modest watering, and strategic positioning I’ve described throughout this guide work with rosemary’s natural preferences rather than against them. I’ve found that once you get these fundamentals right, rosemary becomes one of the most reliable and rewarding herbs you can grow.

Start with a hardy variety suited to your local climate, prepare your soil properly with plenty of grit for drainage, and resist the urge to water frequently. Position plants where they’ll receive good sun and some shelter, particularly during establishment. Whether you’re growing rosemary in borders, containers, or trained as a low hedge, these principles remain the same. With minimal care beyond occasional pruning and harvesting, your rosemary can provide fresh leaves for cooking year-round whilst adding evergreen structure and lovely flowers to your garden. The aromatic foliage alone makes it worthwhile, but having proper home-grown rosemary transforms everything from roast potatoes to focaccia bread in ways that shop-bought herbs simply cannot match.

Author: Megan Walker

Megan focuses on seasonal food, kitchen garden growing, and how households can reconnect with where their food comes from. Her writing blends practical growing advice with ideas for cooking and eating in season. With a passion for fresh ingredients and sustainable living, Megan’s articles help readers make the most of local produce while supporting British farms.