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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.
Germination is more likely to happen if the soil is moist and has a temperature near 77 degrees F; however, seeds can still grow in soil temperatures as low as 50 degrees F. The more light, the more likely the seeds will germinate.The seedling stage, which is when the plant is first forming a crown of leaves near the ground (but before a stalk rises and forms a flower), lasts about eight to 15 weeks.he more light, the more likely the seeds will germinate. The seedling stage, which is when the plant is first forming a crown of leaves near the ground (but before a stalk rises and forms a flower), lasts about eight to 15 weeks.