While researching for my wedding boquet I discovered that you can have them freeze dried. According to the source I read (this was last year so you may have to do a web search) the process leaves the flowers less brittle than traditional drying, making them last longer. Some florists sell their flowers freeze dried ahead of time to make them last.
Hope this helps.
Rachel Foster
The Grace Museum
Registrar Intern
102 Cypress Street
Abilene, Texas 79601
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