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Impatiens walleriana

bedding impatiens

Eastern Africa (Tanzania and Mozambique primarily, with neighboring countries carrying native populations); the species grows in moist tropical forest understory, along stream banks, and across shaded rocky slopes at low to moderate elevations in its native range

Attracts Pollinators Container Friendly

SunPart Shade – Full Shade

WaterHigh

Overview

Impatiens walleriana is a tender mounding annual in the family Balsaminaceae spp., native to eastern Africa (Tanzania and Mozambique). Plants form compact well-branched mounds 6–18 inches (15–45 cm) tall and 10–18 inches (25–45 cm) wide on succulent translucent stems that carry glossy elliptic-to-ovate leaves 1.5–3 inches (4–8 cm) long in medium-to-dark green coloration. From spring through frost, plants produce a continuous succession of flat-faced spurred flowers 1–2 inches (2.5–5 cm) wide in white, pink, salmon, coral, orange, red, violet, and bicolor selections across the cultivar range. Individual flowers are five-petaled with a characteristic spur at the back of each flower; flowers self-clean (drop without deadheading) and are produced in such numbers across the bloom window that the foliage runs largely obscured at peak bloom. Impatiens walleriana runs the most-stocked shade annual in commercial cultivation across the temperate horticultural trade. Since approximately 2012, downy mildew (Plasmopara obducens) has devastated plantings worldwide; disease-resistant breeding lines and good air circulation substantially reduce risk in garden and commercial contexts. Plants are grown in a new location each year and potting soil from affected plants is not reused in subsequent seasons.

Native Range

Impatiens walleriana is native to eastern Africa, primarily Tanzania and Mozambique along with adjacent countries, where the species grows in the understory of moist tropical forests, along stream banks, and across shaded rocky slopes at low to moderate elevations. The species has been cultivated worldwide as a summer annual since its 19th-century introduction to Western horticulture, though the wild populations remain restricted to the native African range.

Suggested Uses

Planted as bedding plants in shaded beds, borders, containers, and hanging baskets at 8–12 inch (20–30 cm) spacing across the full growing season. The species runs one of very few annual plants that performs in dense shade conditions where most other flowering annuals fail outright. Useful in mass plantings under trees or in north-facing beds where other flowering annuals cannot sustain bloom. Companion plantings with caladiums, ferns, and begonias supply foliage and form contrast in shade-garden compositions. Container cultivation requires a minimum 1-gallon pot. Toxic to pets if plant material is ingested.

How to Identify

Identified by succulent translucent stems, glossy elliptic leaves, and flat-faced spurred flowers 1–2 inches (2.5–5 cm) wide produced continuously without deadheading across the bloom window. The combination of succulent stems, shade tolerance, continuous self-cleaning bloom, and the characteristic flower spur at the back of each individual flower are diagnostic. Leaves wilt rapidly in drought or full-sun exposure—a reliable indicator of the species's high water requirement.

Appearance

Size & Dimensions

Height6" - 1'6"

Width/Spread10" - 1'6"

Colors

Flower Colors

red

Foliage Colors

Fall Foliage Colors

Bloom Information

Bloom Period

~26 weeks

Spring Summer Fall

Bloom runs from planting time through first frost across all growing zones. In zones 9–11, plants may bloom nearly year-round in partial-shade positions. Flowers are produced continuously without deadheading; individual flowers last 2–3 days and drop cleanly from the plant. Plants bloom most heavily in cool-to-warm temperatures; extreme heat above 90°F (32°C) temporarily reduces flower production across the canopy until cooler conditions return.

Detailed Descriptions

Flower Description

White, pink, salmon, coral, orange, red, violet, and bicolor selections; flat-faced five-petaled spurred flowers 1-2 inches wide carried continuously across the plant body; self-cleaning so spent flowers drop without deadheading

Foliage Description

Medium to dark green; glossy elliptic to ovate leaves 1.5-3 inches long carried on succulent translucent stems across the growing season

Growing Conditions

Sun Requirements

SunPartial Shade SunFull Shade

Tolerates up to 4 hours of direct sunlight daily

• Full Sun: 6+ hours of direct sunlight

• Partial Shade: 3-6 hours of direct sunlight

• Full Shade: Less than 3 hours of direct sunlight

Soil Requirements

pH Range6.0 - 7.0(Neutral)

357912

Soil Types

loam clay

Drainagemoist

Water & Climate

Water Needs

High

Care & Maintenance

Care Guide

Plants go outdoors after all frost risk has passed in partial-to-full shade in moist humus-rich well-drained soil (pH 6.0–7.0). Full-sun exposure bleaches foliage and causes severe wilt; partial shade is essential for reliable performance. Watering runs consistently; impatiens wilt rapidly in dry conditions and do not recover fully once severely stressed. Soil is kept moist between waterings without allowing full dryness. A balanced water-soluble fertilizer is applied every 2–3 weeks through the season to sustain heavy bloom production. Planting locations are rotated annually and plants are discarded at season end to reduce downy mildew spore load in the garden soil. Overhead watering is held off because wet foliage promotes downy mildew development — drip irrigation or base-level watering supplies better disease pressure management.

Pruning

No deadheading is required because spent flowers drop cleanly from the plant without manual intervention. If plants become leggy in midsummer, cutting back by one-half stimulates compact bushy regrowth within 2–3 weeks of the cutback. Plants are removed entirely after first frost; plants from beds where downy mildew was observed are not composted because the spore load carries into subsequent seasons through compost-based mulching.