Digging Dahlia Tubers Your dahlias will continue to grow until you receive your first frost. After your first frost you should cut back your dahlias to slightly above ground level.
We let our tubers sit for a time in the ground before digging to harden them off. Dig all of your tubers before the ground freezes.
Brush off as much soil as you can, even rinse with water and let dry before storing.
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