At a glance
Britain has 59 resident butterfly species, ranging from the widespread and familiar to the genuinely rare. Of these, around 15 to 20 will visit gardens with any regularity, and a well-planted, well-managed garden can attract a good proportion of them from late spring right through to early autumn. The garden butterfly list is not fixed – it shifts with the season, the weather, the surrounding landscape and the plants on offer. A buddleia in full flower on a warm August day in a suburban garden can attract half a dozen species in an afternoon. A garden with nothing but manicured lawn and bedding plants may see almost none all season.
Understanding which butterflies are likely to appear, what they are looking for when they visit, and what their caterpillars need to complete the full life cycle turns a passive garden into an active one. Most butterflies that visit gardens come only to feed on nectar – they breed elsewhere, on foodplants their caterpillars require. But some species do breed in gardens, and the difference between a garden that simply attracts them and one that sustains a breeding population is usually a matter of providing both the nectar source and the larval foodplant within the same space.
How to identify common garden butterflies
Most garden butterfly species can be identified confidently by size, upper wing colour pattern, and the time of year. The table below covers the species you are most likely to encounter in a UK garden, with the key identification features that separate similar-looking species at a glance. Underwing patterns are often just as distinctive as upperwings, particularly for the browns, so it is worth watching a settled butterfly from both angles before it takes flight.
When to expect them – flight seasons by species
Butterfly seasons in the UK are more complex than a simple summer window. Some species hibernate as adults and can appear on warm days in any month from February onwards. Others overwinter as eggs, caterpillars or pupae and emerge as adults in spring. Several species have two or three distinct broods during the year, meaning they appear in waves rather than as a single season. Understanding this rhythm makes it much easier to identify what you are seeing and to know whether the garden is providing what butterflies need at each stage of the year.
The small tortoiseshell and peacock are the most likely visitors in early spring, emerging from winter hibernation on the first warm days of February or March to feed before breeding. By late April the orange-tip and brimstone are on the wing. From late May the whites and blues become active, and by midsummer the full cast is flying – a hot July or August day on a garden buddleia is the single best opportunity to see the widest variety in any one session. The red admiral, a partial migrant augmented each year by Continental arrivals, often flies well into October and occasionally into November during mild autumns.
The best nectar plants for butterflies
Nectar plants are the foundation of any butterfly-friendly garden. Not all flowers are equally useful – butterflies have long tongues and strong preferences, and a plant that looks beautiful to us may offer very little to them. The best butterfly nectar plants share certain characteristics: they are single-flowered rather than double (double flowers have petals where the nectaries should be, making the nectar inaccessible), they are rich in sugar, and they flower at the right time to coincide with the butterflies that need them. The combination of continuous nectar provision from March to October, with something for the autumn species as they prepare to hibernate or migrate, is the ideal to aim for.
Buddleia is the single most impactful butterfly plant you can grow. A mature buddleia in full flower on a warm day in July or August will attract more butterfly species and individuals than almost any other plant. The variety ‘Black Knight’ is particularly rich in nectar. However, buddleia provides nectar only – it is not a larval foodplant for any UK butterfly. Plant it alongside larval foodplants for maximum impact rather than relying on it alone.
Creating the right habitat
Nectar plants are essential but they are only half the picture. To support butterflies through their full life cycle – not just attract passing adults – a garden needs to provide larval foodplants, hibernation sites for the overwintering species, and open sunny areas where butterflies can bask and warm themselves. Butterflies are cold-blooded and need warmth to function. A garden that is shaded throughout the day, however well-planted with nectar flowers, will rarely be busy with butterflies because they cannot get warm enough to fly, feed or breed effectively.
Larval foodplants are the most significant addition many gardeners can make. Nettles are the single most important – they are the foodplant for small tortoiseshell, peacock, red admiral and comma caterpillars. A small patch of nettles in a sunny corner, ideally with some dead stems left standing, is more valuable to butterfly breeding than almost anything else you can do. Garlic mustard supports orange-tip and green-veined white caterpillars. Holly and ivy support holly blue. Grasses support many of the brown species. These do not need to be large areas – a square metre or two of the right plant in the right location makes a genuine difference.
Species spotlight – small tortoiseshell
The small tortoiseshell is one of Britain’s most familiar butterflies and one of the most important garden species. Historically abundant, it has declined significantly over the past two decades in southern England, with populations holding up better in northern England and Scotland. The reasons for its decline are not fully understood but are thought to involve a combination of habitat loss, changes to land management, and the impact of a parasitic fly introduced accidentally from the Continent whose larvae kill tortoiseshell caterpillars before they can pupate.
Conservation, decline and what gardeners can do
The UK has lost 80% of its butterfly population over the past four decades. The causes are complex – agricultural intensification, loss of wildflower meadows, changing land management, and climate change all play a role – but the trend is consistent and alarming. Gardens now represent one of the most significant refuges for many species, particularly in urban and suburban areas where the surrounding landscape offers little suitable habitat. The collective impact of millions of private gardens managed with wildlife in mind is genuinely significant at a landscape scale.
The most practical actions any garden owner can take are well established. Planting nectar-rich flowers across the full season, tolerating nettles in a sunny corner, avoiding pesticides (particularly systemic insecticides which persist in plant tissue and poison caterpillars feeding on treated plants), and leaving areas of longer grass are the four most impactful changes. None of these requires a large garden or significant cost. A single buddleia, a square metre of nettles, a patch of sedum and the decision not to spray are enough to make a genuine contribution to supporting the butterfly populations that remain.
Double-flowered ornamental plants are almost useless to butterflies. Many popular garden plants – double petunias, double begonias, chrysanthemums, fully double roses – have been bred so that the stamens and nectaries are replaced by extra petals. They look attractive but offer virtually nothing to nectar-feeding insects. Always choose single-flowered varieties where possible, and check that a plant labelled “wildlife friendly” actually has accessible nectaries.
For more detailed identification help and to report your sightings, Butterfly Conservation maintains the most comprehensive UK species database and runs the annual Big Butterfly Count, which is the world’s largest citizen science butterfly survey.
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