Shade-tolerant white impatiens border. Plant 12 inches apart (measured center to center). The more tightly they are spaced, the taller they will grow. For a deeper, denser border, plant one row offset in front of another, with 10.5 inches between rows. New Guinea Impatiens have better foliage and will tolerate more sun, but are still not full sun plants. If you can provide a moist soil with some relief from the sun during the hottest hours, they are an excellent border choice.