It's important to check your flowers daily and keep the vase with fresh water. Every few days, remove the flowers from the design and re-cut the stems. Remove 3/4" to one inch from the bottom of the stem and be sure to cut the stem at an angle to allow the flower the best chance to take up water. Remove any spent or damaged blooms or foliage that falls below the waterline in the vase. If you completely change the water, you should also thoroughly clean the container. Even if the container has floral foam, you should keep the water level high to promote long lasting flowers.