I've done something similar. At the side of the house I had a patch of around 50m^2 (I think...). Last year in spring I sowed a bunch of wildflower seeds bought

I've done something similar. At the side of the house I had a patch of around 50m^2 (I think...). Last year in spring I sowed a bunch of wildflower seeds bought from a local garden supplies store. It already bloomed quite nicely last summer but this spring it has already turned into an explosion of colorful flowers. Also doesn't require much maintenance so far (which was one of the goals for that patch :) ). Before sowing it last spring I had it covered up for the winter with this tarp that still allows water through, after carefully removing all the weeds and plowing it in the fall. This year, as spring was slowing setting on, I removed the bigger pieces of dead material and sowed some extra seeds on bald spots. Still waiting if that is taking hold. I'm pretty happy with how it turned out so far, as are the (humble)bees, butterflies, ...