questions: telling that he wants to preserve his cut flowers to keep fresh for a period of 15 days. how would it will be possible and asking the preventive measure for the same. 
 answers: suggested to prepare a mixture of 2 cups lemon-lime carbonated beverage along with 1/2 teaspoon of household chlorine bleach and 2 cups of warm water and to dip the flowers stem into it.other suggestions advised is to protect them from decay or infection, to trim away any foliage which would be below the water line because the wet leaves encourages microbial growth which can rot the flowers and to remove any unnecessary leaves because they accelerates dehydration of the flowers.