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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.
Seeds germinate when the soil reaches a specific temperature range surrounding an optimal temperature. The closer the temperature is to the optimal temperature for seed germination, the more seeds will germinate in the shortest amount of time.For example, although 90 percent of all onion seeds will germinate if planted at 32 degrees Fahrenheit, they will take up to 136 days to sprout.By contrast, 99 percent of onion seeds will germinate if planted at 68 degrees Fahrenheit and will take less than five days to grow.eeds germinate when the soil reaches a specific temperature range surrounding an optimal temperature. The closer the temperature is to the optimal temperature for seed germination, the more seeds will germinate in the shortest amount of time.