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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.
The length of time it takes a seed to germinate depends on a range of factors. Some of the most important are: The range of germination times generally varies from as little as one day (e.g. for some mustard seeds) to over one year (e.g. for some trees).f you want to plant (or have recently planted) seeds and want to know how long it will be before you start to see some green shoots, there is no quick answer. In temperate countries, most commercially sold garden flower seeds can be expected to germinate in somewhere between 14 to 30 days.