Why Let the Lawn Go?

A close-mown lawn is a hard-working but hungry thing. It takes mowing, watering in dry spells and feeding to stay green, and in return it offers very little to wildlife. A strip of ryegrass cut to two centimetres has almost no nectar, no shelter, and nowhere for a caterpillar to hide. Letting parts of it grow longer, and adding flowers, is one of the cheapest, kindest things you can do for bees in a British garden.

The trick is not to surrender the whole lawn at once. A patch of just two metres by three metres, left to flower, will pull in bumblebees, hoverflies, solitary bees and the odd butterfly, and it will still look deliberate if you edge it well. The patch does the work: clover and bird's-foot trefoil feed the bees, longer grass shelters frogs, beetles and over-wintering ladybirds, and the shallow roots hold your soil together far better than bare earth would.

Cut Out a Patch of Turf

Choose a spot that gets plenty of sun — six hours a day is ideal — and mark out an irregular shape rather than a neat rectangle. Curves sit more naturally in a garden and make it look as though the wildflowers were always meant to be there.

• Wait for a damp day in early autumn, ideally September or October, when the soil is warm and rain is on the way.
• Cut the outline with a half-moon edger or a sharp spade, then slice the turf into 30-centimetre squares.
• Slide the spade underneath each square at about five centimetres depth and lift it cleanly.
• Stack the removed turf upside down in a corner. In a year it will rot into lovely crumbly loam you can use elsewhere.

You do not have to dig everything out. Raking the grass hard with a spring-tined rake until you see bare soil will do for a start, especially on thin or sandy ground. On heavy clay, removing the turf is worth the effort because grass will otherwise out-compete young wildflowers. If you would rather not dig at all, cover the patch with black polythene or old carpet for a full growing season and let the lack of light do the work.

The Magic of Yellow Rattle

Yellow rattle is the single best tool a wildlife gardener has for turning lawn into meadow. It is semi-parasitic: its roots tap into the roots of grasses and steal their vigour, thinning the sward and opening up the gaps that wildflowers need. Where yellow rattle thrives, grass stops bullying everything else.

Sow it in autumn, between September and November. The seed needs a spell of cold, damp weather before it will germinate, which is why spring sowings so often fail. Scatter roughly half a gram to one gram per square metre — mix it with dry sand so you can see where it lands — onto soil you have scratched bare with a rake. Do not bury it. Press it in with a board, a roller or the flat of your boot, and let the weather do the rest.

In the first spring, keep the patch mown fairly short until the rattle is up and growing, then leave it alone. By June you will see its yellow, lipped flowers above the grass. In July the ripe seeds rattle in their papery cases — shake a few into a paper bag and scatter them into next year's patch to keep the cycle going.

What to Sow Alongside It

Once the grass is weakened, you can introduce flowers. Choose native species suited to your soil, and buy seed or plug plants of British origin rather than a general-purpose "bee mix" full of non-native annuals.

• White and red clover — cheap, tough, and a magnet for bumblebees.
• Bird's-foot trefoil — loved by long-tongued bumblebees and the food plant of common blue caterpillars.
• Selfheal, yarrow and meadow buttercup — low-growing, generous with nectar, and happy in most soils.
• Oxeye daisy, knapweed and field scabious — taller plants that give the patch structure and feed butterflies.
• Dandelions and daisies — already in your lawn, and among the first food for queen bumblebees in March. Leave them.

Plug plants are the surest route on stubborn ground. Plant them in autumn, water them in, and keep the grass around them short for the first season. Aim for a mix that is roughly a quarter flowers by weight, and resist the urge to add fertiliser — richness favours grass, and lean soil favours flowers.

Managing the Patch Through the Year

The main cut comes in late July or August, once the flowers have set seed and turned brown. Cut to about five centimetres, then rake off the clippings and compost them. Leaving them to rot back in will feed the grass and undo your good work.

After that, a second tidy cut in late autumn keeps things neat, but leave a strip uncut over winter so insects and seed-eating birds have somewhere to shelter. Cut half the patch one year and half the next if you want to be generous; the extra stems cost you nothing and help a great deal. Never strim down to the roots, never spray, and never feed.

A Damp Corner Is a Bonus

If your lawn holds water in winter, or you garden near a ditch, stream or pond edge, treat that wet ground as an opportunity rather than a problem. Wetland wildflowers are spectacular value for wildlife, and many will cope with ground that is boggy for half the year.

Plant or sow cuckooflower, whose pink spring flowers are the food plant for orange-tip butterflies, along with ragged robin, marsh marigold, purple loosestrife and water mint. These thrive where yellow rattle would sulk, so keep the two areas separate. Even a buried washing-up bowl turned into a mini bog, with a stone ramp for frogs and hedgehogs, adds another layer of life. Dig, sow, stand back — and let the hum begin.