True lilies come from the family Lilium of which there are about 1,200 different species. While many other flowers may have lily in their name, such as Day Lilies, they are not true lilies. True lilies come in three different varieties, Asiatic lilies, which bloom first in late spring to early summer, Oriental lilies, which have the largest and most fragrant blooms and Trumpet lilies, which have the largest stems and fused petals. All of these lilies grow well from zones 3 to 8, in most cases.
Deadhead the lily's blossoms as they began to fade. Hold the lily with one hand and make a clean cut right under the head of the flower.
Trim off any damaged or diseased foliage from the lily plant.
Cut down the lily's foliage in the fall when it has turned brown. Cut down all the dead stalks with the gardening shears to the crown of the plant.
Mulch over the lily bulbs with a 2 to 4 inch layer of mulch to protect the bulbs during the winter.