Impatiens are extraordinarily popular and versatile flowering plants that have captured the hearts of gardeners around the world for generations, belonging to the large and diverse family Balsaminaceae. With over 1,000 species found naturally across tropical and subtropical regions of Asia, Africa, and Central America, impatiens represent one of the largest genera of flowering plants on earth, ranging from delicate wildflowers growing in forest understories to robust, showy garden varieties bred specifically for their spectacular and continuous flowering performance.
The blooms of impatiens are deceptively simple yet undeniably beautiful — flat, open-faced flowers with five rounded petals that appear in a dazzling spectrum of colors including white, pink, salmon, coral, orange, red, purple, and lavender, as well as stunning bicolor and double-flowered forms that resemble miniature roses. What makes impatiens truly extraordinary as garden plants is not the individual beauty of each flower but the sheer, relentless abundance with which they are produced, creating a continuous, smothering display of color that persists from late spring right through to the first autumn frosts without any deadheading required.
Impatiens are quintessentially shade-loving plants, and this characteristic above all others accounts for their enduring popularity among gardeners worldwide. In a world where most spectacular flowering plants demand full sun, impatiens thrive and bloom prolifically in the dappled shade and indirect light conditions that prevail under trees, along north-facing walls, and in shaded courtyards and patios — places where color is most desperately needed and most difficult to achieve with other flowering plants. This invaluable shade tolerance makes them truly irreplaceable in the gardener’s toolkit.
The name Impatiens refers to the remarkable and somewhat startling seed dispersal mechanism that these plants have evolved. When the mature seed pods are touched, brushed, or disturbed in any way, they explode with considerable force, catapulting seeds several feet away from the parent plant in a sudden burst that surprises anyone who encounters it unexpectedly. This explosive mechanism has earned impatiens several evocative common names including Touch-me-not, Jumping Jack, and Snap weed, all of which capture something of the plant’s lively and unpredictable character.
The impatiens family encompasses a wide and varied range of types suited to different garden situations and conditions. Standard bedding impatiens (Impatiens walleriana), known as Busy Lizzies, are compact, prolific, and ideal for shaded beds and containers. New Guinea impatiens (Impatiens hawkeri) are larger, bolder, and more sun-tolerant, with striking foliage as well as flowers. The SunPatiens series, developed through extensive hybridization, represents a major breakthrough in producing vigorous, sun-tolerant, disease-resistant impatiens that thrive in conditions that would stress or kill traditional varieties.
Disease resistance has become an increasingly important consideration in impatiens growing following the devastating outbreak of impatiens downy mildew that swept through gardens across Europe and North America in the early 2010s, causing catastrophic losses among standard Impatiens walleriana varieties. The crisis prompted an intensive response from plant breeders, resulting in the development of new mildew-resistant series including Beacon, Imara, and Bounce, which have successfully restored impatiens to their rightful place as one of the most reliable, beautiful, and rewarding flowering plants available to gardeners growing in shaded situations.
How to Grow Impatiens From Seed
- Understand the Challenge of Growing Impatiens From Seed — Growing impatiens from seed is a genuinely rewarding but somewhat demanding process that requires more patience, attention, and care than starting many other annual flowers from seed. Impatiens seeds are tiny, slow to germinate, and require specific conditions of warmth, humidity, and light to germinate successfully. Understanding these requirements from the outset and preparing accordingly gives you the best possible chance of achieving strong, healthy seedlings.
- Source Quality Fresh Seeds — Always begin with the freshest, highest quality impatiens seeds available from a reputable supplier. Impatiens seeds lose viability relatively quickly compared to many other annual seeds, so always check the packet date before purchasing and avoid using seeds that are more than one to two years old. Fresh seeds from the current season give significantly better and more reliable germination rates than older stored seeds.
- Start Seeds Very Early Indoors — Impatiens have a long growing period from seed to flowering plant and must be started indoors very early in the season — typically 10–12 weeks before the last expected frost date in your area. Starting too late results in small, underdeveloped plants at planting-out time that take much longer to establish and begin flowering than those given a proper head start indoors under controlled conditions.
- Prepare Seed Trays With Fine Seed Compost — Fill seed trays or small pots with a very fine, light, well-draining seed-starting compost that has been thoroughly moistened before use. Firm the surface gently to create a smooth, even sowing surface. A fine-textured seed compost is essential for impatiens, as their tiny seeds need intimate contact with a smooth, consistent growing medium to germinate successfully and produce healthy, uniform seedlings.
- Sow Seeds on the Surface — Impatiens seeds are extremely tiny and require light to germinate, so they must be sown on the surface of the seed compost rather than being covered with soil. Sprinkle seeds as thinly and evenly as possible across the surface of the moistened compost, spacing them as far apart as their small size allows. Mixing seeds with a small amount of fine silver sand before sowing makes it considerably easier to distribute them thinly and evenly.
- Do Not Cover Seeds With Compost — Resist the temptation to cover impatiens seeds with even a thin layer of compost after sowing, as covering them blocks the light they need to trigger germination. Instead, after sowing, press seeds very gently onto the compost surface using a flat piece of card or the bottom of another pot to ensure good seed-to-compost contact without burying them. Good contact with the moist compost surface is essential for successful germination.
- Provide Warmth for Germination — Impatiens seeds require consistently warm temperatures to germinate successfully, ideally between 70–75°F (21–24°C). A heated propagator is the most reliable way to maintain these temperatures consistently day and night throughout the germination period. Alternatively, place seed trays on a heat mat or in the warmest available indoor location. Cold temperatures dramatically slow or completely prevent germination, so maintaining adequate warmth is absolutely non-negotiable.
- Maintain High Humidity — Cover seed trays with a clear propagator lid, a sheet of glass, or a clear plastic bag after sowing to create a warm, humid environment around the seeds. The enclosed, humid atmosphere prevents the tiny seeds and surrounding compost from drying out, which would be fatal to germinating seeds. Check regularly and wipe away excess condensation from the cover to maintain good visibility and prevent water dripping back onto the seeds.
- Provide Light During Germination — Unlike many seeds that prefer darkness during germination, impatiens seeds need light to germinate and should be placed in a bright position immediately after sowing. Place seed trays on a bright windowsill or under grow lights, ensuring they receive good levels of light while also maintaining the warm temperatures required. Avoid placing trays in direct, intense sunlight, which can overheat the enclosed propagation environment and damage germinating seeds.
- Be Patient and Persistent — Impatiens seeds are notoriously slow and sometimes erratic in their germination, typically taking anywhere from 14 to 21 days to sprout under ideal conditions, and sometimes considerably longer. During this waiting period, maintain consistent warmth, moisture, and light without disturbing the seeds. Check trays daily, removing the cover briefly to ventilate and checking moisture levels, but otherwise resist the urge to intervene or give up prematurely on trays that appear slow to respond.
- Care for Seedlings After Germination — Once seedlings emerge, remove the propagator cover gradually over several days to acclimatize them to lower humidity levels without causing them to dry out suddenly. Move seedlings to the brightest available position to prevent them from becoming pale and leggy. At this stage, impatiens seedlings are extremely small and delicate, so handle them with great care and maintain consistently moist but not waterlogged compost around their tiny, fragile roots.
- Prick Out Seedlings Carefully — When seedlings have developed their first pair of true leaves and are large enough to handle, carefully prick them out individually into small cells or pots filled with good quality potting compost. Always handle seedlings by their leaves rather than their fragile stems, which are easily damaged or bruised. Give each seedling its own individual cell or pot so it has the space, light, and nutrients it needs to develop into a strong, healthy transplant.
- Begin Feeding Seedlings — Once seedlings are established in their individual cells or pots and have developed two or three sets of true leaves, begin feeding them every two weeks with a balanced, water-soluble liquid fertilizer diluted to half the recommended strength. Regular feeding from this early stage supports healthy root development, strong stem growth, and the development of the vigorous, bushy plant structure that will ultimately support a prolific flowering display.
- Harden Off Before Planting Outdoors — Impatiens seedlings raised in the warm, sheltered conditions indoors must be gradually acclimatized to outdoor conditions before being planted outside permanently. Begin the hardening off process about two weeks before the intended planting date by placing seedlings outside in a sheltered, shaded spot for increasing periods each day, gradually exposing them to more outdoor light, air movement, and temperature variation until they are fully adjusted to outside conditions.
- Plant Out After All Frost Risk Has Passed — Impatiens are frost-tender plants that will be killed by even a light frost, so never plant them outdoors until all risk of frost has completely passed and nighttime temperatures remain consistently above 50°F (10°C). Choose a shaded or partially shaded planting position with moist, humus-rich, well-drained soil, space plants 8–12 inches apart to allow good airflow, and water them in thoroughly after planting to help them establish quickly in their new outdoor home.