Harvest the lilies from your garden first thing in the morning, when the flowers are imbued with water. Using a sharp pair of pruning shears, cut the stems approximately 4 to 6 inches below the head to ensure the stalk is not damaged, as the plant can continue to grow after the bulb is removed.
Bring the flowers inside and, while holding the stems under a cool tap, cut away the bottom inch with a sharp knife or pruning shears. Cutting the stem on the diagonal allows it to effectively absorb water.
Fill a vase with warm water and a floral preservative powder, available at a local florist. Do not use hot water to prevent damaging the lily’s delicate stems.
Remove any dead or decaying leaves and arrange the flowers inside the vase. Set the vase in a warm room, or one that is at least 70 degrees Fahrenheit, in a spot that is away from direct sunlight.
Change the water and preservative daily. The combination of the warmer temperatures and warm water force the lilies to bloom more rapidly.