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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.
Growing impatiens from seed is a good way to save money if you like to plant flats and flats of these popular annuals. The ideal time to start the seeds is eight to 10 weeks before the last frost in your area. Fill seed flats with a sterile seed-starting mix that you have moistened. It should be damp but not wet.