That quilt was originated here on this board by a member and there are many pictures of people that made them. It is on my bucket list to do. I think at one time she offered the pattern to a couple people. You might try looking in the albums here to find them.
Yes the petals would be appliqued onto the backing. There are some great tutorials on applique on line. Utube and I think even allpeoplequilt.com has them to watch to give you confidence enough to make it.