Wildflowers are flowers that grow on their own without cultivation. There are hundreds of species of wildflowers belonging to dozens of families. Most wildflower seed mixtures contain both annual and perennial seeds. This is because the annuals bloom quickly and last all season but don't come back the following year. While the perennials won't bloom until the second season, their blooms only last a few weeks but will come back year after year with more and more flowers. The mixture gives you the most color and diversity among your flower garden.
Choose an area of your landscape that receives a full eight hours of sun a day and does not hold standing water for more than three hours after a heavy rain. Plan planting for spring or fall; in the fall, the seeds will not come up until the following spring.
Prepare the seed bed by first scraping off the turf along the top of the soil with a straight-edged shovel. Till the area to a depth of 6 inches and water the area. Allow the bed to sit for two weeks, watering every other day. This will germinate the weed seed that is left in the soil. Remove the weeds that come up after the two-week period.
Place 2 inches of compost over the bed and till it into the soil. This will ensure good drainage for the flowers. Good drainage is a must for wildflowers, so if you have very heavy clay soil, you may need to add some sand or leaf mold. Rake the soil out to make a smooth seed bed for the flowers.
Apply the seed using a broadcast spreader as you would for grass seed. If seeding a particularly large area, add eight parts of sand to one part seed before spreading. This will help to deliver the seed evenly and show you where you have seeded so you don't miss any spots in the bed.
Use a lawn roller to lightly go over the seed. This will ensure seed contact with the soil and good germination.
Cover lightly with clean straw. This will hold the seed in place while it germinates and takes hold of the soil. It will also help to keep the moisture in the soil and help with germination.
Water thoroughly yet lightly so as not to wash the seed into one area. Keep the seed bed moist until all the seed has germinated. If seed was used that is native to your area, it should not need watering once established; however, during very hot and dry conditions, supplemental watering will be necessary.