I'm making a rainbow cake covered in sky blue buttercream with green fondant grass and flowers up the sides (and a standing up rainbow on the top). I was thinking of making the grass in one long green ribbon like this but deeper.

http://2.bp.blogspot.com/_noXFu3XbwDY/S8PpJUJjEmI/AAAAAAAAAHI/Mgx-PWethUM/s320/IMG_1385.JPG

Will this stick to the buttercream along with lots of fondant flowers and butterflies?

If so, how long in advance can I apply it?

Thanks

I just finishe a crusting buttercream cake and I applied black fondant zebra stripes to it before it crusted and it worked beautifully. The stripes I made were similar is size as your grass. You shouldn't have a problem with it if you apply them before buttercream is crusted.

Thanks for replying ttaunt.

I was hoping to do the buttercream the night before applying the fondant as I only have a couple of hours each night free and I am new to cake decorating so everything takes me a long time.

How would I stick fondant decorations to crusted buttercream? Or would that not work?

just slightly dampen the back of the fondant and press lightly onto cake that should work also