Depends. Read the directions on the packets. I think with wildflowers you just sprinkle [Only registered and activated users can see links. ] over them. With sunflowers, I plant mine maybe an inch down--making a row with a hoe--and then cover them with an inch or so of soil. I used to be able to grow beautiful sunflowers, but the darn varmints (chipmunks) dig up the seeds and the rabbits or groundhogs eat the sprouts or the plants. I've sprinkle dried blood (you can buy it at the [Only registered and activated users can see links. ] center or farm store) and that helps until it rains.