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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.
For example, European primrose (Primula vulgaris) seeds normally take 2 to 4 weeks to germinate if the conditions are right, but may germinate more quickly (in 2 or 3 days) if placed in a small pot of damp compost and placed in a polythene bag indoors at 15 - 20 degrees C.orn seed germination requires temperatures at least 50 Â°F. Under the correct conditions, it takes 3-6 days for the sweet corn seed to germinate.