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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.
Wait until they harden and begin to open, and youâll see the seeds. This is the time to collect them. Ripe peony seed pod Photo: Flickr glaciergirl. To germinate, the seeds need a period of moist warmth for a few weeks or months, and once a root has emerged, they need a period of cold for about 10 to 12 weeks.ereâs what you need to know: 1  Popular cultivars donât come true from seed. 2  Many peonies â generally, the big double ones â are infertile (they donât produce pollen or seeds). 3  Patience is required. 4  From seed it can take five to seven years to produce a mature flower.