September 27, 2026
Planting an elm in a British garden once felt like a waste of good ground. Dutch elm disease swept the great majority of our mature elms out of the landscape from the late 1960s onwards, and the tall hedgerow trees that gave so many counties their shape simply went. What is less well known is that breeders kept working throughout. The elms you can buy today are a very different proposition from the native trees that were lost.
Why Dutch elm disease still decides what you can plant
Dutch elm disease is caused by fungi in the genus Ophiostoma, carried from tree to tree by elm bark beetles that breed under the bark of dying elm. The beetles fly to healthy trees to feed in the crown, and introduce the fungus as they go. Native English elm, field elm and most wych elms have almost no defence against it, and an infected tree can be dead within a season or two.
Because English elm spreads by root suckers, the roots outlived the tops. That is why elm still appears in hedges and roadside scrub, growing to four or five metres before it succumbs and starts again from the same roots. Wych elm has fared a little better in the wetter west and north, where beetle numbers are lower and the tree sets seed rather than relying on suckers, but it remains susceptible.
So any elm you plant now is either a species from a part of the world where the fungus does far less damage, or a hybrid bred with that resistance built in.
Resistance, tolerance and the small print
Two words get used loosely in catalogues, and the difference matters. Resistance means a tree is unlikely to be infected in the first place. Tolerance means it may well be infected but often survives, sometimes with dieback. The elms sold as disease-resistant in the UK generally sit in the first group. None is immune, and none comes with a guarantee.
Ratings also travel badly. A cultivar trialled in the Netherlands, Italy or Wisconsin is meeting different strains of the fungus and different beetle pressure from those in a Surrey garden or a Perthshire glen. The same tree can be listed as "highly resistant" by one nursery and "resistant" by another, and both sellers are being honest.
Growing conditions tip the balance too. An elm sitting in waterlogged clay, drought-stressed on thin chalk, or regularly nicked by a strimmer is a weaker tree than one given space and a decent start. Resistance is genetic; health is your half of the bargain.
The main resistant elms compared
Japanese and hybrid lines
These are the workhorses — vigorous, long-lived and with the longest track record in British planting.
- Ulmus 'New Horizon' — bred from Japanese and Siberian elm parentage, vigorous and upright with a broad, slightly vase-shaped crown and deep green leaves. Probably the most widely planted resistant elm in the UK, and a good choice for a larger garden, park or street. Expect roughly 12–15 metres in time.
- Ulmus 'Rebona' — a close relative, faster growing when young and narrower in habit, which makes it easier to place in an avenue or a generous front garden. Resistance is well regarded.
- Ulmus 'Sapporo Autumn Gold' — an older selection with the same broad outline and reliable golden autumn colour. Vigorous and generous, though its resistance is usually rated a notch below the two above.
Dutch and French selections
- Ulmus 'Lobel' — a Dutch tree with a stiff, upright, narrow habit, often planted in streets and squares. Good resistance, and easy to site where width is limited.
- Ulmus 'Columella' — narrow, almost columnar and slower growing. One of the best options for a small garden or a tight corner, provided it is not shaded out.
- Ulmus 'Lutèce' ('Nanguen') — French breeding, conical in shape, with high resistance to Dutch elm disease and also to elm yellows, a disease not currently established in Britain. Widely used in European cities.
- Ulmus 'Vada' ('Wanoux') — from the same French programme, a smaller, rounder tree with good resistance. Less commonly sold here.
Southern European cultivars
- Ulmus 'San Zanobi' and Ulmus 'Plinio' — Italian selections bred from field elm and Siberian elm, chosen for resistance and for the broad vase shape typical of Mediterranean elms. They turn up in UK and European street planting.
Availability shifts from year to year. Some of these are easy to find from British nurseries; others arrive in batches. Ask whether the stock was propagated here rather than imported, and order early if you want a named cultivar — elms are usually sold bare-root between late November and March.
Choosing one for your garden
- Measure the space honestly. Most resistant elms become medium to large trees. 'Columella' and 'Lobel' suit a small plot; 'New Horizon' and 'Sapporo Autumn Gold' need room to spread.
- Check the soil. Elm is adaptable but dislikes sitting wet. On heavy clay, plant slightly proud and mulch well. On thin chalk, be ready to water for the first two summers.
- Consider exposure. Shelter from the prevailing wind helps any young tree establish, whichever cultivar you choose.
- Don't plant the same cultivar everywhere. If you have room for two elms, mix them. Genetic variety is your insurance policy.
- Buy named stock. A cultivar with the name on the label is worth far more than an unnamed "elm" of uncertain origin.
Planting, pruning and the habits that protect a tree
Bare-root planting is done between late autumn and early spring, ideally in November or December while the soil is still warm. Keep the roots damp and get the tree in within a few days of delivery. Container-grown elms can be planted almost any time if you water them properly through the first summer, using a full watering can or two a week in dry spells. Stake for the first two or three years, mulch with five to eight centimetres of well-rotted compost kept clear of the trunk, and keep grass and weeds away from the base.
Pruning needs care. Prune only between late autumn and early spring, when the beetles are not flying; fresh summer wounds are an invitation. Remove dead, crossing or rubbing branches then, and keep pruning to a minimum otherwise. Protect the trunk from mowers and strimmers with a guard or a mulch ring — bark damage at the base is the most common self-inflicted injury a garden tree suffers.
Finally, never stack elm logs with the bark still on. Bark-covered elm is exactly where bark beetles breed. Burn it, chip it, or strip the bark.
Symptoms to watch for, and what to do
In July and August, watch for leaves on one branch or one side of the crown wilting suddenly, curling, turning dull yellow and then brown while the rest of the tree still looks green. Later, whole limbs die. If you peel back the bark on an affected branch you may see brown streaking in the wood beneath — the classic sign.
There is no cure for an infected tree. If you suspect Dutch elm disease, ask a qualified arborist or your council's tree officer to take a look. Prompt removal of the affected tree, and disposal of the timber by burning or chipping, reduces the beetle breeding material nearby. Don't move elm logs around the country. Elm zigzag sawfly, first recorded in Britain around 2017, also strips leaves from elms in some areas; it looks alarming but rarely kills a healthy tree.
Planting an elm this autumn
Pick one cultivar that genuinely fits your space, order bare-root for November, and plant it with a stake, a mulch ring and a sensible watering plan. Prune only in winter, keep the base clear of machinery, and note the cultivar name somewhere you will still find it in ten years — it matters if you ever need advice about the tree.
If you have room for a second elm, choose a different cultivar. And if you garden in Scotland or the wetter west, a locally grown wych elm is worth considering alongside a resistant hybrid, accepting that it carries more risk. Elm is one of the most valuable trees you can offer wildlife: the white-letter hairstreak butterfly depends on it, and dozens of moth species feed on the leaves. Planting one is a small act of restoration.
Photo: Thomas P / Pexels
