Impatiens

Plant impatiens transplants outdoors after all danger of frost has passed and nighttime temperatures remain above 50 degrees Fahrenheit. Choose a location with partial to full shade, as traditional Impatiens walleriana cannot tolerate direct sun for more than a few morning hours. Space plants ten to twelve inches apart in rich, moist, well-drained soil amended with generous amounts of compost.

Impatiens are moisture-loving plants that wilt dramatically when dry but recover quickly after watering. Keep soil consistently moist throughout the growing season, watering whenever the top inch of soil feels dry. Apply a two to three inch layer of mulch to retain moisture and keep roots cool. In containers, check moisture levels daily during hot weather, as impatiens in pots dry out faster than those in the ground.

Feed every two to three weeks with a balanced liquid fertilizer to sustain continuous blooming. Impatiens are self-cleaning and never need deadheading, making them the ultimate low-maintenance shade flower. Pinch young plants once to encourage branching if they arrive from the nursery with a single stem. Watch for downy mildew, a devastating disease that has become widespread in many areas, and consider switching to resistant SunPatiens or New Guinea impatiens if your area is affected.

Impatiens walleriana, commonly known as busy Lizzie, is a tender perennial native to the mountainous tropical forests of eastern Africa, where it grows wild along stream banks and on the damp, shaded forest floor in countries including Tanzania, Mozambique, Kenya, and Malawi. The species was first described scientifically by the British botanist Joseph Dalton Hooker in 1868 and was named in honor of Horace Waller, a British missionary and antislavery activist who collected plant specimens during his years in East Africa. The plant was introduced to European horticulture in the late nineteenth century, initially grown as a greenhouse curiosity and conservatory specimen. Its ability to flower profusely in low light conditions quickly made it popular among Victorian gardeners who struggled to find colorful plants for their shaded parlor gardens and north-facing window boxes. By the early twentieth century, plant breeders in Europe and the United States began developing compact cultivars in a broader range of colors, transforming impatiens from a botanical oddity into a mainstream bedding plant. The mid-twentieth century saw an explosion in impatiens popularity as garden centers and nurseries recognized the enormous demand for shade-tolerant annuals. By the 1980s and 1990s, impatiens had become the best-selling bedding plant in North America, with hundreds of millions of plants sold annually. This dominance was challenged beginning around 2004 when a devastating strain of downy mildew caused by Plasmopara obducens began spreading through impatiens plantings worldwide, wiping out entire landscape installations almost overnight. The crisis spurred intensive breeding efforts that led to the development of resistant species and interspecific hybrids, including the increasingly popular Impatiens hawkeri (New Guinea impatiens) and SunPatiens series. Today impatiens remain a beloved choice for shade gardens, containers, and hanging baskets around the world, valued for their unmatched flower power in low light and their forgiving, easy-care nature.

Impatiens thrive in rich, humus-laden, consistently moist soil with a pH of 6.0 to 6.5. Amend planting areas with generous compost to improve moisture retention and soil structure. Apply a balanced slow-release fertilizer at planting time and supplement with liquid fertilizer every two to three weeks during the growing season. In containers, use a moisture-retentive potting mix and feed weekly with diluted liquid fertilizer. Avoid letting soil dry out completely, which stresses plants and reduces flowering.

Impatiens are not grown as cut flowers and their succulent stems do not hold up well in arrangements. No deadheading is needed, as spent flowers drop cleanly on their own. Impatiens produce seed pods that snap open explosively when touched, hence the common name touch-me-not. To collect seeds, wrap a nearly ripe pod gently in tissue and squeeze to trigger it. Store the tiny seeds in a paper envelope in a cool, dry place. Impatiens self-sow freely in mild climates.

Impatiens are not suitable for cutting or drying. Their value lies entirely in their live performance as shade-garden and container plants. To preserve favorite varieties over winter, take three to four inch stem cuttings before the first frost. Impatiens root extremely easily in water within seven to ten days. Pot rooted cuttings and grow indoors on a bright windowsill through winter, then move outdoors again after the last spring frost.