Does anyone know what to do with U.F.O. Fruit from Space and Flowers?

I can´t decorate with them or let my Sims eat the fruit and I can´t put it ino fridge. Do they have a special purpose? Another question: I can´t graft daisies and strawberries together to get the Dragonfruit. It always resets the Sim. Is there a patch/bug fix for this?