Just because you want wildflowers doesn't mean you have to have a meadow to use them. I have a bed that is about 4' x 20' that I use for wildflowers. I seeded them in patches and then let them grow and mix. I won't say the current effect is exactly what I had envisioned when I started, but it does work for me. And yes, mowimg keeps them controlled, especially the annuals. Anything with a taproot will likely bounce back after mowing if it has managed to establish itself.

Yup^. The only thing I'd add is, perhaps consider using mostly or all lower-growing types. This has nothing to do with plant culture, what will work, or anything like that, but is instead a design consideration. Narrow beds look goofy-IMO, and that of many others-when filled with tall-growing stuff. Other than that tidbit, I see no problem with this and in fact, am happy to see your planning to do this.

+om