Plant native wildflowers in the fall - wait for the rains and even the first snow! Scratch up the ground a bit, pat them in (don't bury them!), and watch them pop up in the spring. Depending on how thickly you sow the seeds you can cover a large area with this amount (up to an acre)...it's tough to say exactly, but wildflowers also naturalize over time, so don't sow them too thickly. 
 
Native Seed Plant Mix 1
 
Little Sunflower, Blanketflower, Nineleaf Lomatium, Arrowleaf Balsamroot, Large-flowered agoseris, Silky Lupine, Lewis Flax “Whitman”, Fern-leaf Lomatium, Oregon Sunshine, Showy Milkweed, Elkhorn Clarkia, Wild Hollyhocks, Taperleaf Penstemon, Western Aster, Tall Cinquefoil, Missouri Goldenrod, Western Yarrow, and Roundleaf Alumroot.