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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.
1 The seed packet should tell you how many days to bloom, which means how long it takes from germination to flowering. 2  If you have a short growing season and the packet says it will be 80 or 90 days to bloom, you will need to start the seeds indoors if you want to see them flower for a couple weeks before frost. Some annuals, such as impatiens, will be a good size for transplanting when they're about eight weeks old. 2  But if you start your zinnias eight weeks before transplanting, they'll be root-bound and too tall by the time they go into the garden.