Why caterpillars matter more than colour

It is tempting to fill borders with bright, cheap bedding plants each spring. They flower for months, need little thought, and give an instant lift. But if you want your garden to be part of the living British landscape, those imported petunias and begonias are a missed opportunity. Native plants, from oak to purple loosestrife, are the engine room of local food webs. They feed far more caterpillars, seed-eaters, and pollinators than almost any exotic bedding you can buy. The difference is not marginal. It is the difference between a colourful display and a functioning habitat.

The hidden cost of imported bedding

Most bedding plants are bred for looks, not for wildlife. They are selected for big, long-lasting flowers, often double, which means little or no nectar and pollen. Their leaves are frequently unpalatable to UK caterpillars, which have evolved alongside native plants over thousands of years. A bed of busy lizzies or pelargoniums may hum with a few hardy bees, but it will not raise a single butterfly or moth. Nor will it feed seed-eaters. We deadhead bedding to keep it blooming, so there are no seed heads for goldfinches, greenfinches, or sparrows. And because many are tender, they need watering, feeding, and peat-based compost, which adds to their environmental cost.

Native plants that punch above their weight

British native plants support a huge range of wildlife. An oak tree, for example, is a caterpillar factory, feeding hundreds of species. But you do not need a tree to make a difference. These native plants are practical, beautiful, and generous:

• Oxeye daisy – long-lasting white flowers for bees and hoverflies, seeds for finches.
• Foxglove – nectar for bumblebees, and a food plant for the foxglove pug moth.
• Viper’s bugloss – a magnet for bees and butterflies, especially in dry, sunny spots.
• Hemp agrimony – late-summer nectar for butterflies and moths, and seeds for birds.
• Teasel – seeds for goldfinches, and water-holding stems that insects use.
• Wild strawberry – ground cover, flowers for pollinators, and fruit for birds and small mammals.

These plants are adapted to our climate. Once established, they need far less watering and feeding. They also look naturally at home, softening hard edges and linking your garden to the wider countryside.

Wetland wonders for a soggy corner

If you have a pond, bog garden, or rain garden, native wetland plants are unbeatable. They support a completely different set of wildlife, from dragonflies and damselflies to frogs, newts, and seed-eating birds. Try these British species:

• Marsh marigold – early nectar for bees and hoverflies, and cover for froglets.
• Purple loosestrife – tall spikes of nectar-rich flowers for butterflies and long-tongued bees.
• Yellow flag iris – bold flowers and seed heads, plus stems for emerging dragonflies.
• Water mint – aromatic leaves and late nectar, loved by bees and hoverflies.
• Ragged robin – delicate pink flowers for bees, and a food plant for the marbled coronet moth.
• Reedmace (bulrush) – seed heads for birds, and stems that support the bulrush wainscot moth.

These plants do more than look pretty. They filter water, stabilise pond edges, and provide shelter for amphibians. A native wetland corner is one of the most wildlife-dense habitats you can create in a small garden.

Practical swaps for a wildlife-friendly garden

You do not have to rip out every exotic plant. But you can make simple swaps that give you colour and wildlife. Instead of petunias, plant oxeye daisy or viper’s bugloss. Instead of busy lizzies, try water avens or hemp agrimony. Instead of trailing pelargoniums, use wild strawberry or selfheal in containers. For hanging baskets, consider native trailing plants such as ivy-leaved toadflax, which copes with some dryness and offers tiny flowers for insects. If you must have bedding, choose single-flowered varieties and let some go to seed. Above all, aim for a mix: native plants for caterpillars and seed-eaters, exotics for a late nectar top-up. Every native plant you add is a small act of habitat creation.

Building a living larder, not just a display

Native plants are not just another gardening trend. They are the base of a food chain that starts with caterpillars and ends with the birds you feed in winter. A garden full of native flowers, grasses, and wetland plants is a living larder. It offers nectar, pollen, leaves, seeds, and shelter. It needs less watering, less feeding, and less fuss than a bedding display. And it connects your patch to the wider British landscape, from the pond at the bottom of the garden to the hedgerows and wetlands beyond. So this year, before you reach for another tray of imported bedding, think of the caterpillars. Think of the seed-eaters. Then choose a native plant, and watch your garden come alive.