Answer: You can use a portable greenhouse to overwinter tender perennials, but annuals won't winter over. Annuals grow for only one season. There are cool season annuals and warm season annuals. They grow, flower, set seeds and die. That's why they are classified as annuals. But, you can save seeds from your annuals and sow them in flats in a portable greenhouse about 6 weeks prior to your average last frost of the season. By the time the soil warms up, your plants will be ready to go out in the garden. Best wishes with your garden!
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