For some effects, you can plant your lilies in groups of three or five identical bulbs. Space the plants 8 to 12 inches apart. Depending on the vigor and size of the lilies, keep the groups 3 to 5 feet apart. Small lily bulbs are planted 2 to 4 inches deep, and the larger bulbs about 4 to 6 inches deep. Fertilize only once when the buds start to emerge. low nitrogen fertilizer is just fine. When flowers bloom and wilt, remove the deadheads to encourage further blooms. If you want cut flowers from the blooms, cut half of the stalk. Never cut the foliage because it is needed to ensure the vitality of the plant. If you have a pond with fishes in it, then try adding some water lilies. They provide a habitat for micro-organisms that fishes feed on, according to the Texas A&M University. By doing so, your fish would not require too much artificial food. Aside from food sources, Langston University recommends using water lily for fish ponds since they may provide shade and also hiding places for fishes. Peace lilies are also susceptible to pests, so check fore mite infestation. You could easily reduce risks by wiping the leaves like when removing the dirt. Be sure to remove dead flowers and leaves, so that the lily would grow eventually grow more flowers and foliage. Word of caution against peace lilies, make sure that children and pets do not eat the leaves. Although, these beetles could be removed with chemical pesticides, experts recommend that the bulbs be cleaned before planting. Also, be warned against botrytis, powdery mildew, rust and aphids. If you have noticed these pests, immediately treat them. Diseases like these could easily spread to nearby bulbs. (Of course, the soil must drain well.) They are herbaceous plants, meaning they can be grown from bulbs. However, they can not go completely into a dormant stage. This means the lily can also be cultivated using tubers for planting materials. The plant body can grow from 4 to 6 feet in height. To get the right exposure to the sun, they need to have around 18 to 24 inches of space around them.