My great grandmother would never take less than 13 primroses into the house for fear that this would stop the hens laying! Once you have a enough flowers they can be chopped up  and mixed into boiling mutton fat to produce a soothing ointment which healed cuts and bruises or anyone with a sore eye could bath it with warming water in which dried primrose leaves had been soaked for a few minutes. If that was not enough primroses will keep witches away!