Dahlias can most certainly be grown in Zone 4, but must be treated as an annual as the tubers will not survive your winters. Plant tubers after the threat of frost has passed in the spring and then lift the tubers to store for the winter following the first frost in the fall.
In terms of what dahlias to plant, you should discuss this with your local garden center to see what is available and/or contact your local cooperative extension to learn what varieties of dahlias thrive in your specific area.
Hi Katherine,
Dahlias can most certainly be grown in Zone 4, but must be treated as an annual as the tubers will not survive your winters. Plant tubers after the threat of frost has passed in the spring and then lift the tubers to store for the winter following the first frost in the fall.
In terms of what dahlias to plant, you should discuss this with your local garden center to see what is available and/or contact your local cooperative extension to learn what varieties of dahlias thrive in your specific area.