Plant 'em and they will come
My biggest gardening event this year was planting a succession of wildflower gardens for the Monarch Watch program. After seeding a mix of annual and perennial wildflowers (you must be vigilant for weeks about watering and weeding until all is established) and a large patch of native milkweed given to us by our botanist/landscaper/neighbor, Niki, we waiting all summer for the monarchs to appear. Finally, one fall day, after the asters had bloomed two did. They stayed for a couple weeks feasting mainly on the milkweed and purple asters. The bees and the humming birds loved the wildflowers.