Can the flower alstromeria be dyed. More specifically, can it be dyed periwinkle?

Answer 1

The way it's done depends on if its fresh flowers or dried you want to color. Yes, there's always a way to dye flowers to the color you want. Check this out...
Using Flower Dye, Preserved Gardens
How to dye flowers and foliage before pressing or drying to prevent fading. ... your ferns, foliage, and flowers as usual, but add the dye to the warm water solution. ...www.preservedgardens.com/flower-dye.htm

Answer 2

This works best with white flowers, but will work with any color. Put food coloring in a container with water - amount depends on your mood. Put flower in colored water and watch the fun begin.