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Q&A: Planting Annuals in the Fall
Answer: Petunias, cosmos and impatiens are not cold hardy so any plants that germinate in the fall would not survive in regions with cold winters. It is possible that the seeds might survive and sprout in the spring, but they would not do so until the weather had warmed and the soil had warmed. This would mean your plants would be much smaller and later than new transplants that have been started in the greenhouse or indoors. The winter heaving and thawing along with the severe weather conditions may also cause the germination rate to drop substantially. In my experience it is far better to wait until spring.
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Posted Comments:
09-06-2008 08:39
Beth wrote:
planting seeds in fall
I've not planted annuals in the fall; but nature does a tremendous job with cleome and cosmos up in Northern Michigan. Don't deadhead - let the seeds mature and drop. I have had dozens of plants in the spring - But, I can't count on them. Some years it works; some it doesn't. They don't come up early in the spring, so they seem to be behind the commercial ones I buy; however, it doesn't take them long to be bigger and better - their roots never have to crunch up in that little plastic space! Petunias and impatiens - their seeds have never made it through our winters.
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