Did you forget to water a houseplant, or go away for a long time and come home to what looks like a dead plant? Before you toss it, give it a second look. Many plants will drop their leaves and flowers in an effort to stay alive. The plant does it to protect the root system, which really is the nerve center of a plant. (This is also true for many plants that are accidentally left outside in the frigid cold all winter.) To revive a plant, simply trim off all the dead leaves and flowers. Then give it a good soak of water and place it in a warm, sunny spot. In three weeks, you'll know if the plant is truly dead if it does not sprout any new leaves.