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The dahlia foliage is blackedThe dahlia foliage is blacked by frost damage. The roots, however, are still alive. Remove the frost kill and see if the plant recovers. If not, you may still be able to lift the roots and store.

2015 Special Edition Garden GuideCooking Fresh with The Old Farmer's AlmanacThe Almanac Monthly Digital MagazineWhat the heck is a Garden Hod?