Freeze-dried rose petals look lifelike and last longer than fresh ones. The process of freeze-drying involves extreme temperatures, which turns any moisture in the flower petal directly from liquid to a gas, allowing the petals to keep their shape without shrivelling. Freeze-dried rose petals are often used as table decorations or for throwing at weddings in place of confetti that could stain the flooring. In order to freeze-dry rose petals, you need a freeze-drier that is specific for the task.
Allow your fresh roses to open until the petals can be picked easily and in whole pieces. Be careful not to wait until they begin to brown around the edges.
Sort through the detached petals and discard any that are torn or bruised.
Lay the petals in a single layer in your freeze-drier.
Allow the freezer to reach -7C and then use the vacuum pump to remove all the air inside.
Over the next two weeks, gradually increase the temperature inside the freezer until the petals have reached room temperature and are ready for use.
Freeze-drying rose petals is trickier than it seems. Before you go to the expense of purchasing a freeze-drier, research whether purchasing pre-made, freeze-dried petals would be cheaper and less hassle for you in the long run, particularly if you only need them for a single function.
If flower freeze-drying is something you would like to do long-term, speak to an established professional and see if they will allow you to sit in on the process once or twice.