The Q&A Archives: Planting Dahlia Tubers

Question: I live in Northern New Jersey, and I would like to know when the appropriate time is to plant dahlia tubers. May 15th is the date in my area when it is safe to plant frost sensitive plants. I'm only mentioning this to give you an idea of the climate conditions in Northern New Jersey.

Answer: Dahlias do not tolerate frost and need warm soil to grow well so the rule of thumb is to wait about one or two weeks after your average last frost date -- to some extent this will depend on the weather in any given year. For this reason many gardeners will start their dahlias early in pots where they can be started indoors and then set in cold frames or otherwise protected from frosts yet gain a head start.

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