New Guinea impatiens were not introduced in the U.S. until 1972, according to Dr. J. Raymond Kessler, Jr. of Auburn University. This annual flowering plant has larger flowers than its impatien cousins and bronze or green leaves. New Guinea impatiens grow from 12 to 24 inches tall and bloom from spring to fall in a variety of colors. These low-maintenance plants don't require deadheading.
Locate your New Guinea impatiens in the appropriate place in the garden. If you live in the northern regions of the U.S., plant in an area that receives sun in the morning and shade in the afternoon. In hot, dry regions, plant them in filtered sunlight.
Water the impatiens to keep the soil moist at all times. Do not water the soil to the point of sogginess. Slightly and consistently moist soil is sufficient.
Place a 2-inch layer of mulch on the soil around the New Guinea impatiens. This will discourage weeds and keep the soil moist and cool.
Fertilize the New Guinea impatiens bi-weekly with a liquid 20-10-20 formula, according to the rate suggested on the label.