How to Grow Tarragon in the UK

French tarragon is one of the great culinary herbs – the ones that genuinely transform a dish rather than merely seasoning it. The distinctive warm, sweet, anise-like flavour is irreplaceable in béarnaise sauce, chicken dishes, egg cookery and cream-based sauces. No other herb offers quite the same character, and having it growing in the garden or on a patio means you can use it fresh, at its most aromatic, whenever a recipe calls for it. A well-grown plant will produce harvests every season for a decade or more, which makes it one of the best long-term investments in a kitchen herb collection. It is one of the four fines herbes of French cuisine alongside chervil, chives and parsley, and a garden that grows all four can produce this classic combination fresh from May to October.

The one complication with tarragon is that buying the right plant is critical. Two completely different plants are sold under the name tarragon, one of which is an exceptional culinary herb and the other essentially worthless for cooking. The choice between them is not a matter of preference – it determines whether you end up with a productive, flavourful herb or a vigorous weed with no kitchen use. Understanding the distinction before you buy is the most important single piece of tarragon knowledge. This guide is concerned specifically with French tarragon, and everything in it – the planting advice, the overwintering requirements, the culinary guidance – applies to French tarragon only.

French vs Russian tarragon – the decision that matters most

French tarragon (Artemisia dracunculus French, also sold as ‘Sativa’) and Russian tarragon (Artemisia dracunculus Russian, syn. ‘Inodora’) are both variants of the same species but produce completely different plants. The differences matter enormously in practice.

The only reliable way to confirm you have French tarragon before buying is the scratch test: pinch or scratch a leaf firmly between your fingers and smell immediately. French tarragon produces a strong, sweet anise aroma that is unmistakable and distinctive. Russian tarragon smells faintly grassy with little else. If a plant is on a shelf in a garden centre and you have any doubt, perform this test before buying. If tarragon is available as seed packets, it is almost certainly Russian – French tarragon does not set viable seed in UK conditions and seeds are not commercially produced. This rule applies without exception: if you can buy tarragon seeds, it is the wrong type.

Russian tarragon is not quite worthless – it is fully hardy, grows vigorously and the flowers attract pollinators in midsummer – but it has almost no culinary value and is not worth the growing space when the goal is a kitchen herb. If you have Russian tarragon already growing in your garden, do not try to improve it by cutting hard or feeding: the flavour is in the genetics, not the management. The only sensible course is to remove it and replace with a confirmed French tarragon plant. This is not a minor issue – someone who has been growing Russian tarragon for years thinking it is the culinary herb will have been systematically disappointed by the results and may have concluded that tarragon is overrated as a herb. It is not overrated; it is simply that the wrong plant was grown.

French tarragon was historically grown as a border perennial in UK kitchen gardens and still can be in the right conditions – a warm, south-facing kitchen garden wall with free-draining soil provides the shelter and drainage that makes outdoor overwintering possible. The key shift in understanding for UK growing is that this is not a fully hardy plant that tolerates neglect. It is a Mediterranean perennial that needs managing through the UK winter rather than one that simply looks after itself. Once that adjustment in expectation is made, it becomes a straightforward and enormously rewarding herb to grow.

Planting – position, soil and containers

French tarragon needs full sun and excellent drainage. These are the same conditions that suit rosemary, thyme and sage – the full Mediterranean herb suite – and French tarragon performs best when positioned alongside them rather than in the moister, more fertile ground suited to basil, parsley or mint. A warm, sunny, sheltered spot is ideal: south or west-facing with protection from cold east winds.

Because French tarragon is not fully hardy, container growing in the UK is strongly recommended. Growing in a pot of at least 30cm diameter makes it possible to move the plant under cover before the first autumn frosts – into an unheated greenhouse, cold frame, porch or conservatory – which is the only reliable way to guarantee it survives a UK winter. Use John Innes No. 3 compost mixed with a generous proportion of horticultural grit (about one part grit to three parts compost) for containers. This provides the drainage and the structured compost that suits tarragon better than standard multipurpose mixes, which can compact and retain too much moisture. The container must have adequate drainage holes.

In-ground planting is possible in the mildest, most sheltered UK gardens – against a south-facing wall in the south-east of England, for instance, with excellent drainage and a winter mulch of dry straw or grit over the crown – but the risk of loss in a hard frost or a wet winter remains real. Most UK gardeners growing French tarragon will have better results with containers. Space in-ground plants 45-60cm apart if planting multiple specimens; a single well-established plant produces more than enough for most households. Tarragon does not spread aggressively and a single container plant kept well-tended for several years can become the productive centrepiece of a patio herb collection, providing fresh leaves from late spring right through to the first frosts.

Seasonal care and overwintering

French tarragon dies back to the ground naturally in autumn and regrows from the roots each spring. This dormancy period is normal and expected – the plant is not dead even though it appears so by December. The roots remain alive through winter and new stems emerge in April when temperatures rise. The dormancy does not mean the plant is undemanding in winter, however: the roots cannot tolerate freezing. A container left outside in a hard frost will lose the plant entirely, whereas the same plant moved into an unheated but frost-free structure will come back reliably year after year. The critical window is October and November – once the growing season has finished and temperatures are dropping, act without delay. A night or two at hard frost temperatures is enough to damage the roots of a containerised plant left outside.

During the growing season, French tarragon in a container needs watering moderately – often enough that the compost does not dry out completely, but not so often that it stays constantly wet. The distinction matters: wet roots in a warm growing season encourage root rots, while dry roots cause stress and reduce leaf production. Checking the compost with a finger before watering and allowing it to dry slightly between waterings is the correct approach. In-ground plants rarely need watering beyond their first season once established, as French tarragon is reasonably drought tolerant during the growing season even though the roots need winter dryness. Feeding once in spring with a dilute balanced fertiliser is sufficient for container plants; repeat feeding encourages soft, lush growth that reduces the aromatic oil concentration in the leaves. In-ground plants in fertile soil need no feeding at all.

Propagation by division and cuttings

Because French tarragon cannot be grown from seed, division and cuttings are the only ways to propagate it. Both are straightforward and are also the correct management tools for keeping established plants vigorous.

Division is the main propagation and rejuvenation method. Lift the whole clump in spring as growth is just resuming, and use two garden forks back-to-back to prise it apart into sections, each with a healthy set of roots and a few emerging shoots. Replant divisions immediately in well-prepared ground or containers at the same depth. Established plants should be divided every three or four years to maintain vigour – old clumps produce less foliage and can lose flavour intensity over time as the productive root system becomes congested.

Cuttings are the other reliable method. In late spring, take 8-10cm softwood tip cuttings, strip the lower leaves and root in a mix of equal parts compost and grit in a small pot. In late summer, take 8-10cm semi-ripe stem cuttings using firmer, partly-hardened growth. Both types root in four to six weeks in a sheltered, bright position out of direct midday sun. Bottom heat from a propagating mat speeds rooting but is not essential. Pot on once roots fill the small pot and overwinter under frost-free cover in their first winter before planting out the following spring. Young plants from cuttings in their first season are vulnerable – do not attempt to harvest heavily until they are established in their second year.

Harvesting and using tarragon

Harvest by cutting stems back by about one third, taking the young shoot tips rather than stripping individual leaves. The best flavour comes from the young, pre-flowering growth in May and June – the essential oils that carry the characteristic anise taste are most concentrated at this point. Once the plant flowers in midsummer, the leaves become slightly less intense. Cutting the plant back by half in midsummer, after the first flowering, stimulates a fresh flush of leafy growth with good flavour through August and September. Even in the second half of the season, well-managed French tarragon produces usable leaves right up to the first frosts of October. The total harvest window from a single plant, managed correctly, runs from late April through to October – a six-month fresh herb season from one container plant.

Tarragon is best used fresh rather than dried – the volatile oils that carry the anise flavour degrade quickly during drying, producing a herb with perhaps a quarter of the character of the fresh version. Dried tarragon from a jar will work as a background seasoning in long-cooked dishes but will not produce the immediate, distinctive flavour hit of a fresh sprig. For short-term storage, wrap whole stems loosely in damp kitchen paper and refrigerate for up to a week. For longer preservation, infusing into white wine vinegar or neutral olive oil captures more of the flavour than drying and produces genuinely useful condiments for the kitchen. A small jar of tarragon vinegar made in July will still be excellent the following February, long after the fresh leaves have gone with the first frosts.

Common problems and diagnosis

Tarragon has few serious pest or disease problems, but several recurring issues all trace back to the same two causes: the wrong type was planted, or the winter management was incorrect.

Beyond the two main problems, tarragon occasionally suffers from root rot in waterlogged conditions (preventable with gritty compost and good drainage), aphid infestations on young spring growth (usually minor and self-resolving as natural predators arrive), and occasional powdery mildew in hot, dry conditions with poor air circulation. None of these are serious in a well-sited plant. Rosemary beetle – the metallic green and purple-striped beetle that also attacks rosemary, sage and lavender – occasionally affects tarragon stems; pick off by hand if numbers are high. The most productive investment in tarragon health is always the same: get the drainage right, move the container under cover in autumn, and start from confirmed French tarragon in the first place. A plant ticking those three boxes will produce reliably for years with minimal intervention.