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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.
Impatiens from seed: light and temperature. Impatiens in a container. Place your flats under grow lights or near a window where they get bright indirect light. The soil temperature should be about 70 to 75Âº F (21 to 24Âº C).Your impatiens seeds should sprout within seven days to two weeks, although it can sometime take a little longer if temperatures are cooler.lace your flats under grow lights or near a window where they get bright indirect light. The soil temperature should be about 70 to 75Âº F (21 to 24Âº C). Your impatiens seeds should sprout within seven days to two weeks, although it can sometime take a little longer if temperatures are cooler.