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I've not had a wildflower meadow in the UK (not gonna happen in the average London garden I'm afraid). But I have one in Pennsylvania. We dedicated about 1/2 an acre. Most wildflower afficionados in the States recommend you start small & when successful increase the size of the area - so 2-3 acres is a big area for a 1st try. Here's what I did: I went & bought a native wildflower mix for & from our locality - make sure you are NOT getting weed seeds or invasive species. Don't buy a commercial seed mix if at all possible, it's really better if you get a British wildflower book & see what's local for your area, then acquire those seeds. In the spring (before the grasses are tall not super early, but not late - I think it was late April/early May) we spread it into the soil with a rake & then also added additional dried wildflower seeds (in the same manner) that we had in our seed stash - Echinacea purpurea, Rudbeckia hirta, Monarda fistulosa, milkweed (Asclepias), etc. That was 15 years ago now. The area has evolved into predominantly native wildflowers with a few native grasses, & does not get cut back in the autumn every year. If you see lots of weeds or undesirables popping up & they are towering above your wildflowers, then scythe above the height of the wildflowers to help keep the annual weeds out (this will really help in the 1st year, i.e. now). If you do scythe before the annual weeds can set seed they won't come back next year. If you see thug plants or perennial weeds, you will need to hand weed to remove. We also added new seed where some bare spots were after a couple of years - that's normal by the way, 1st year will probably be fab, but by 2nd or 3rd year may need some help/additional seeds.
As to mowing or cutting down, this really varies from site to site. We didn't scythe ours until the 3rd year. When you do decide to mow, I'd suggest that you put off mowing/cutting down your meadow until more than 1/2 of the flowers have dropped seeds - that'll really help the annuals & biennials to reseed. Do NOT mow native grasses in the late summer or early fall instead wait 'til early spring. And my last suggestion is to never cut grasses lower than 15cm.
Hopefully that'll give you an idea of the long-term management. Good luck!
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