Question: Can I leave my dahlias in the ground in New Jersey?
Answer: No. Dahlias are only hardy in zones 9 and 10 so they will freeze to death if you leave them in the ground for the winter. It's a bit of work to dig and store them so some gardeners simply replace them every year.
Q&A Library Searching Tips
When singular and plural spellings differ, as in peony and peonies, try both.