The short answer: late July to September, after the seed has dropped.
An established meadow is cut once, when the show is over — the flowers finished, the seed set and shed. In Britain that usually means between late July and September. Cut to roughly 5–7 cm, let the cuttings lie for a few days to dry and drop their last seed, then take every scrap of them off the meadow.
The removal is not tidiness; it is the mechanism. A meadow is flowery because its soil is poor. Leave the cuttings to rot and you fertilise the ground — and fertile ground grows coarse grass at the expense of everything you planted the meadow for. The annual hay cut, carted away, is what farmers did for centuries and what keeps the balance tipped towards flowers.
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The calendar, in brief
- Year one is the exception. A newly sown meadow is cut little and often — every six to eight weeks — to hold back the fast annual weeds while the slower perennial wildflowers root in. It feels brutal; it is the making of the meadow.
- From year two: the main cut, late July–September. Wait until the flowers you care about have shed seed. An earlier date favours the grasses; a later one is fine if the autumn stays dry underfoot.
- Dry, shed, remove. A few days on the ground lets seed fall and wildlife move out — then everything comes off.
- Leave a share standing. A strip or corner left uncut, rotated each year, carries butterflies, moths and beneficial insects through the winter.
- Aftermath, if it regrows strongly: a further cut or two in autumn keeps the sward tight going into winter — always with the cuttings removed.
The commonest mistakes are the mirror of the rules: cutting in June while everything is still flowering, mowing the whole area at once, and leaving the cuttings where they fall.
Wildflower meadow mowing FAQ
When should you mow a wildflower meadow in the UK?
An established wildflower meadow is given its main cut once a year, between late July and September — after the flowers have finished, set seed and shed it. Leave the cuttings to dry on the ground for a few days so the last seed drops, then remove them completely. In its first year a meadow is treated differently: regular cuts through the season keep fast annual weeds down while the perennial wildflowers establish.
Should you mow a wildflower meadow in spring?
Usually not as the main annual cut. Spring mowing can remove the growth that is about to flower. Keep spring work selective: paths, edges, or a light management cut only where a first-year meadow or a very grassy sward needs it.
How often should you mow a new wildflower meadow in its first year?
A new meadow is normally cut every six to eight weeks through the first growing season, whenever the growth reaches roughly 10–15 cm. This keeps annual weeds and grasses from shading out the slower perennial wildflowers. Remove the cuttings each time.
What do you do with the cuttings after mowing a meadow?
Let them lie for a few days to dry and shed their seed, then rake or bale them off — never leave them to rot down. Cuttings left in place feed the soil, and a fertile soil favours coarse grasses over wildflowers. Removing the hay each year is what keeps a meadow flowery.
Should you cut the whole meadow at once?
Better not. Leaving a strip or patch uncut each year — rotating it annually — gives butterflies, moths and other insects somewhere to overwinter, and keeps seed and shelter in the sward. Cut the rest as normal.
Where this comes from
The method is set out in full in How to Make a Wildflower Meadow by James Hewetson-Brown — founder of Wildflower Turf and the pioneer of the meadow techniques used at RHS Chelsea Flower Show, Kew and the opening ceremony of the 2012 Olympics. The book covers the whole job, not just the mowing: site preparation, seed against turf, native species, over 30 real case studies, and the maintenance year in detail.
“A no nonsense guide full of fool-proof advice and real-life illustrations for the practitioner … Essential reading for the modern meadow maker.” — Helen Bostock, RHS Wisley
For the wider design thinking behind meadows and designed plant communities, read our guide to Naturalistic Planting Design by Nigel Dunnett.
How to Make a Wildflower Meadow
The practical guide to establishing a wildflower meadow at any scale — with methods that flower in the first year, over 30 case studies, and the full maintenance calendar this note is drawn from. 256 pages.
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