Wildflower plants generally require poor soil so the first job is to scrape off all the topsoil. The grass will crowd the seedlings, stopping them germinating. The grass will also be full of weed seeds, which would suffocate the young plants. (This job alone is enough to put everyone off before they begin; this is why creating large meadows is sometimes best left to the professionals!) Don’t despair though if you only have a small area you won’t need to hire a digger!

Rake the seed in to save them being eaten by the birds. Use old C.D’s that newspapers give away as free gifts for scaring the birds. Tie them on to string and let them catch the sun. You might have to do a bit of weeding as the seed establishes. Keep an eye on any weeds that look as though they are going to seed and pull them out.

The lawn will need cutting about three times in the first year, do this when it looks untidy. Take away the cuttings, as this will add to the fertility of the soil. Don’t consider using fertilizer on the lawn this will cause the grass to grow too rapidly and will kill the flowers. After the first year the grass should only be cut when the flowers have set seed. This will lead to a self-sustaining area.

GETTING IT RIGHT
Some wildflower seeds require winter chilling, such as the cowslip. Some need spring temperatures to germinate such as the poppy to break their dormancy. This is why I think it is a good idea to sow the seed directly outside and let nature do the rest. If the conditions are right from the outset then the rest will be easy. Some of the best wildflower gardens have been created on rubble topped off with crushed chalk or crushed concrete.

Amendments and corrections to be introduced from wilflowers.ie

Small meadows in gardens need cutting about 3 times per year, spring to 4inches, high summer to 4 inches and remove foliage and again in autumn, and rake everything up and scratch the earth.
large meadows, may if lucky get away with one cut,
new meadows however with annuals require only one cut in the first year as the annuals act as a nurse crop to protect seedlings

Its okay to scrape off topsoil, in small areas, but why recommend the expense for over 500 metres, better to sow a mixture for fertile soil, these plants grow taller to compeate with grass, all meadows improve soil, so the top  soil will come back in time, it takes about 10 years.

wildflower seed should definitly not be mixed with grass seed for small gardens less than 2 acres.
the research was done in 1970's in England on chalk downland where the grass stops growing in summer, grasses attract butterflies,
in ireland, our research at the teagesc research station Oakpark, 1992 -1996 showed in Ireland grasses competed out the flora, however, 1.5grams of grass to 1.5 grams of wildflowers was best. if grass is needed not the 20% flora and 80% UK grass seed mix.

seed is germinated by sunlight, rake and roll the seed muxst be firm packed to the soil and the soil well rolled before and after sowing, before is best, then scratch the surface.

Gardeners can directly establish many species into a lawn, but it requires cutting to 4inches for two years, we establish flora like this all the time.

Prices vary, the price you quote is not for native Irish, cpuld you please explain the difference, your page visitors are phoning me and asking why we are dearer.
we supply from 20 to 40 species per mixture, there are 6 species mixes and they sell at about 95.00, but there not realy what gardeners want.