Floral preservative can be added to the water at each change or add no more than a quarter teaspoon of bleach for a large vase. The same process can be used for Carnations. Each of these meanings is still used in society today, so they are still valid. White roses are for true love. Red roses are for passion.
Yellow roses are for friendship.
Black roses mean farewell. Yellow roses mean friendship. Pink roses mean friendship or sweetheart. White roses mean purity of the mind. Black roses mean hate and death.