Allow the chive's flowers to open, if you are cutting the purple tops to eat. If you are removing the flowers to allow the plant to grow new leaves, remove the flowers at the bud stage before they have opened.
Remove each individual stalk that contains the purple chive's flower with a pair of sharp scissors. Cut the stalk near the flower as it will be discarded.
Bring the flowers inside and remove any remaining stalks by cutting them off with the sharp scissors. The stalks themselves are edible as well, but do not have a pleasant taste.
Wash the flowers until a cool tap before consuming.