Your flowers will last longest in a cool & dry area (65˚-75˚) out of direct sunlight. Cut stems and change water regularly (every other day). Flower conditioner and ice can be added to water to improve longevity. With proper care, blooms will last 5-10 days in the vase.
For altar decor, atop pedestals and columns or as accents on bars, sign in tables or seating assignment tables