Tips for making a raised bed for Shrubs

Hello, me again... I am in the process of collecting as many bricks that I can to make a raised bed... the dimensions will be approx 18' long by 2' wide, and about 1.5' high (possible 2'), I am hoping to have boxwoods in this location, Should I be concerned with the width of the raised bed for the winter time and having the boxwoods survived?

Zone 5 central Indiana - they will be in a sunny location - thinking of green mountain boxwoods.

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