How to protect zone 7 viburnums in zone 5
I need help deciding wether or not I can plant my zone 7 david viburnums outside in our zone (5)6 yard next spring. I will over winter them in an unheated basement. My non-gardening daughters gave me 3 of them for an aniversary gift. Since these stay relatively small in height I am tempted to plant them outside next spring and some how protecting them next winter. They are so beautiful and I have the perfect spot for them and I have to know that I can protect them enough otherwise they go into containers for the deck...any suggestions? I am willing to do just about anything to protect them (placing straw all around them?) I just got done reading about Japanese maples growing in Canada's zone 3 with winter protection so I have hope!