I used egg white powder. These are safer than raw egg white. I mixed it in a bowl and followed the instructions on the packet.

This shows very fine sugar being put onto a flower coated in egg white.
This is the set up A bowl with mixed egg white with a paint brush to paint on the egg white.
A bowl with very fine sugar but not powder and a teaspoon. I used our castor sugar. You can also make fine sugar in an electric nut grinder.
A plate dusted in fine sugar to place the coated flowers to dry.
Method
Clean flowers by gently dusting with a paint brush.
Use a paint brush to cover the flower with the egg white. I held the flower by the stalk and brushed inside first and then I balanced the flower on my left hand whilst I painted the outer petals with a brush.
I then held the flower by the stalk over the sugar and gently sprinkled the sugar over the flower with a teaspoon on both sides.
I then put the flower on a large plate which has a light dusting of sugar.
I repeated for the other flowers and then left then for 24 hours in a hot place for them to dry out.
I then put into a plastic box to store until I use them on some cupcakes recipes.
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Flowers drying out in the sun in my conservatory. A hot dry cupboard would also work well.
They look so fragile and pretty.
These will look great on some cupcakes I want to do soon.