To do this, start with the center since it will be the darkest color, then go to the outside petals and do the lightest ones first. Work your way in to match the dark color in the middle. If you start at the middle and go out you might not end up with enough of the lightest petals unless you plan really carefully. This way you can always make some darker if needed, but you'll definitely end up with enough of the lighter ones.
Kara Buntin owns A Cake To Remember LLC, online cake supplies at www.acaketoremember.com and www.acaketoremember.etsy.com