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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.
Seed Germination. Soil temperature has an effect on how quickly seeds germinate. If the soil is at 75 degrees Fahrenheit, seeds usually germinate in about seven days. Cooler temperatures slow germination, with seeds in 60 degrees F soil taking two weeks to sprout.If the soil temperature goes down to 50 degrees F, seeds take about 43 days to germinate.ill the pots with growing medium to within 1 inch of the rim. Sow seeds 1/4 inch deep and spaced 1 inch apart, or about two or three seeds per pot.