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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.
Some even flower the first year from seed. Anise hyssop (Agastache): Seeds can germinate in less than a week, but can also take as long as a month. Plants grow 3 to 4 feet tall and sport spikes of lavender flowers that are irresistible to bees and butterflies.Zones 4 to 9.Black-eyed Susan (Rudbeckia) Seeds germinate in about 3 weeks.nise hyssop (Agastache): Seeds can germinate in less than a week, but can also take as long as a month. Plants grow 3 to 4 feet tall and sport spikes of lavender flowers that are irresistible to bees and butterflies. Zones 4 to 9. Black-eyed Susan (Rudbeckia) Seeds germinate in about 3 weeks.