How to Grow New Guinea Impatiens

Prepare the growing area after the last expected frost date in the spring. Work the soil down several inches with the spade. Add 1 to 2 inches of compost and 1 lb. of slow-release fertilizer for each 100 square feet of growing area. Use the spade to work the compost and fertilizer in completely and rake the surface smooth.

Dig holes for the seedlings so that they will be at the same depth as they are in their temporary pots. Space the holes approximately 4 inches apart. For best results, do not transplant the seedlings into the ground during the heat of the day. Place the plants into the holes and refill with soil. Firmly tamp the soil and water generously.

Give New Guinea impatiens enough water throughout the growing season so that the soil stays evenly moist. Do not let the plants dry to the point of wilting. When the weather is cool, provide less water; when the weather is hot, provide more water. Mulch around the plants to control weeds and keep the soil moist and cool.

Fertilize the plants every third time you water. Mix the fertilizer with water according to package directions and water until the plants are moist. If the soil is dry before you fertilize, water the impatiens first and then fertilize to avoid burning the plants with fertilizer.

Trim the plants if they become tall and thin. Cut the stems back to the point where the leaves intersect with the stem (a leaf node). This will encourage the plant to grow bushier.

Cover the plants with a blanket if overnight temperatures will fall below 45 degrees.