I have a wildflower meadow at my allotment,
Johnny Vodka . I have not found this to be anything like easy or quick...despite the many, many seed merchants, keen to sell us packets of 'wildflowers', implying a simple spring broadcasting and we will have sustainable colour with environmentally benign plants. The claims of seed merchants, along with the usual sponsored media tosh are variable - ranging from bullshit to outragous bullshit...and as for quality of seeds! The term 'wildflower' is used in quite a cavalier manner, with quite a number of these mixes containing hardy annuals and tender annuals (such as cosmos, coreopsis, Californian poppies...which have very different requirements to UK native and naturalised wildflowers. Some mixes have grass seed, some are just flowers. A popular mix, often labelled "cornfield mix' contains 4 or 5 annual plants - poppies, cornflowers, ox-eye daisies, corn marigold. Guaranteed flowers from a spring sowing, this is probably the easiest mix. (although preparation is really very crucial). Has to be cleared and resown every year (or it will turn into a poppy-field). A classic hay meadow will be soil and climate specific...and usually takes at least 2-3 seasons to become established.
I could ramble on about my meadow...but it would be a long post. Now in its 4th (or 5th year), it has been a fraught experiment, with an endless list of unforeseen difficulties, hopeful, (but wrong) decisions, moments of transient beauty, and more frustrations (and delights) than all the rest of my plot together.
I think I can see a light at the end of this - possibly next year, when I might have achieved some sort of actual, sustainable, flowery 'meadow'...although it is quite a long way from my initial 'plan'