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Propagating Impatiens by Seed. Impatiens is a slow-growing plant, and youâll need to start the seedlings about three months before your last spring frost. Impatiens seed germination can take up to 21 days, with most of the sprouting happening within the first two weeks.f you grow any flowers outdoors, the odds are good that youâve grown impatiens. This cheerful flower is the most popular one grown in the country, and with good reason. It does well in shade as well as partial sun, and works in planters as a hanging plant and in bedding.
Temperature. Temperatures for various hybrids of outdoor impatiens plants should be 50 to 55 degrees Fahrenheit at night and 65 to 70 degrees Fahrenheit during the day, but others thrive in warmer weather.Watering plants daily will help them stand tall and stay colorful during hot summer days.lthough impatiens grow in Mediterranean climates, they typically prefer shaded temperatures around 65 to 70 degrees Fahrenheit. Impatiens may die if the thermometer dips below 32 degrees Fahrenheit. Flowering impatiens plants need two to four hours of filtered sun per day.