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Anthuriums are native American plants that grow well indoors as houseplants or outdoors in containers or beds. The flower is a bract, which is essentially a modified leaf. These plants require indirect sunlight to produce their flowers; low-light conditions may produce distorted leaves and no flowers. Recommended day temperatures for anthuriums are 78 to 90 degrees Fahrenheit, and nights, 70 to 75 degrees. Leaves will turn yellow if night temperatures drop to 50 degrees or lower; the plant cannot tolerate frost.
Re-pot your anthurium about once a year in the spring if you want to have two plants; otherwise, many anthuriums stay in the same pot for years. Take your plant out of its old pot, and split it into two sections with a sharp sterile knife. Use peat moss-based potting soil in the new pot because these plants need good drainage to thrive.
Make sure your new pot is immaculately clean by washing it in hot water with liquid dishwashing soap. Prepare the new pot by putting broken pieces of a clay pot on the bottom over the drainage holes. Re-pot the plant immediately after cutting, and water it slowly until the water runs out of the holes.
Water your plants thoroughly, and allow them to become slightly dry before you water again. Overwatering anthuriums damages the roots and makes the leaves turn yellow. Do not spray your plants with water; water the soil instead because this helps to prevent disease.
Feed your anthuriums with a slow time release 3:1:2 fertilizer about once every other month. With a new plant from a nursery, wait several months before feeding because growers use this type of fertilizer, and you don't want to overfeed the plant. Your feeding solution should contain 1/4 fertilizer and 3/4 water.
Watch your plant carefully, so you can deal with insects before they get out of control. Anthuriums attract many of the same pests as other houseplants including mealybugs, scales, white flies, aphids and thrips. Wipe your anthurium down with a clean cloth, and water it often to prevent spider mites and other insects. Insecticide soaps are good for soft-bodied insects. Ask your local nursery which insecticide to use for scales. Do not put pesticide on your plants when temperatures are hot or when the plants are wet.
Prevent disease by not having other hanging plants above your anthuriums. Keep the leaves dry, and do not place your anthuriums by plants with infections. You can use a fungicide if you discover a disease on your plant; obtain recommendations from your local nursery.