I recently made a cake with gum paste grass coming out of it. This was my first time making items with gum paste. The gum paste grass was completely dry before I put them on the cake. I assembled the cake an hour before taking it to the party. By the time the party started, the grass was sagging--the part of the gum paste sticking into the cake was now soft and not supporting itself. I used a Wilton gum paste mix. What did I do wrong?

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HTH