i have never made grapes but I remeber seeing something either a magazine or a book....a long while ago! And I remember that they werent hard based on what i saw.......
from what i remember you get floral wire and make a base stem then add and smaller pieces of wire to for the shape of the grape stems. floral tape should hole it all together. dont forget to make a curled vine for the stem. Roll you fondant into grapes and you have to fold over the tip of the floral wire so that when the fondant/gumpaste dries it dries around the ball/grape and wont fall off.
I sorry if this sounds like jibber jabber but its 1am and I am off to bed.......if anything at least this will bump up for you incase someone else has any insight..... i tried googling it but couldnt find anything.......but it looks like a few places sell them online so and if you only need one bunch they should be pretty affordable!
lots of luck
I just did grapes on a cake. It might work for you.
I didn't want to wire them, so I rolled out a thin fondant "base" in the shape of the grape bunch and then rolled fondant balls and stuck them to it. Let them dry over a form and dusted with lustre dust. HTH!
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