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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.
How long does it take for seed to grow. Different seed mixtures establish at different speeds. As a general rule, hardwearing mixtures usually contain ryegrass and red fescue, two species that establish quite quickly-they can germinate in as little as 3-4 days, but 7-10 days is more average.ifferent seed mixtures establish at different speeds. As a general rule, hardwearing mixtures usually contain ryegrass and red fescue, two species that establish quite quickly-they can germinate in as little as 3-4 days, but 7-10 days is more average.