RE: How can I protect my sugar flower paste from humidity and melting?

I make my own florist paste using Maggie Austin’s recipe (not sticky like Squires and doesn’t flop as easily). I make and arrange my flowers around a month ahead of the order date so they are dry when decorating the cake. I store them in cardboard cake boxes filled with biodegradable maize packaging peanuts. A disposable nappy also helps to absorb any moisture. For my display cakes I store them in a small ground floor alcove cupboard which happens to have a central heating pipe in which keeps the air dry. UK summer heat is mostly humid rather than dry. I made the mistake of storing a display cake on the first floor once and the flowers all flopped and drooped within a day. x