When piping flowers onto cakes, it is crucial to use a frosting that holds its shape well without melting too quickly. One of the best frosting options for this purpose is Swiss meringue buttercream (SMB). This delicate yet stable frosting is made by heating egg whites and granulated sugar over a double boiler until the sugar dissolves completely, then whisking the mixture until it reaches stiff peaks. Softened butter is gradually added while continuing to whisk until incorporated fully. SMB has a silky texture that pipes beautifully into intricate flower shapes, holds up well even in warmer temperatures, and provides enough stability for intricate details on your cake decorations without sacrificing flavor.