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Snapdragons or Antirrhinum majus are native to the Mediterranean basin where they are a perennial. In our climate they are commonly grown as an annual that can tolerate some frost and will bloom late in the year.

Although they can survive a mild winter, the next year’s blooms will be scarce and the plants will most likely be infected with a fungus. Most people, therefore, will replace their plants with new specimens.

In answer to your question, cut your snapdragons to the ground. As a herbaceous perennial they may regenerate depending on the weather.