shelf life of fresh lilacs: How To Extend the Life of Fresh Flowers for Staging - 05/14/08 08:53 AM
I know many things go better with Coke, but cut lilacs last longer, look fresher, and smell even better when fed a diet of 1 part 7 Up (NOT diet) and 2 parts water. Before you put them in the vase, smash the ends of the stems with a hammer or meat tenderizing mallet. It allows more water to be absorbed. This arrangement has been in my entryway for 5 days now and looks and smells as fabulous as when I first cut them!
 

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