Tulips should be cut back after they bloom to prevent the blossoms from going to seed. This saves the energy of the plant for bulb production. It is best to keep the leaves green as long as possible, only cutting them back after they have wilted and turned yellow.
Tulips are perennial plants that bloom in the spring. After the blooming season is over, tulip bulbs can be left in the ground, unless they become overcrowded. At this point, the tulip bulbs should be dug up and replanted with more space between them. Unlike the flowers, the bulbs require little moisture but should be watered occasionally during extremely dry conditions. Mulch placed over the bulbs in the winter can insulate them from cold temperatures and prevent damage.
Tulips grow between 4 and 28 inches high. They have few leaves but large flowers that come in a variety of colors. Most tulips only bear one flower per stem, but some species produce multiple blooms per stem. Made up of three petals and three sepals, the flower is generally cup or star-shaped, while the leaves are strap-shaped with a waxy coating. Leaves are arranged alternately on the stem and are a blue-green color.