Try the Hill Country. There are wide fields of them on both sides of the road on Texas 71, a dozen miles or so west from Oak Hill all the way to U.S. 281 north and again through Marble Falls and on to Burnet. Even more than down around Washington-on-the-Brazos.
Then from Burnet west on Texas 29 is good to Park Road 4 and turn left on the park road where crop around Inks Lake is glorious, a few feet high and marching right up to the edge of the road. Mixtures of bluebonnets, red indian paintbrush and the little yellow and pink jobs are somewhat rare on those routes, for some reason, but they can be found here and there.
THE TEXAS SCRIBBLER 