Question
Hello, my question is...I am developing 2 acres of property.  I am putting  a willow tree line break however, I am also planting skyview poplar and I have green ash.  What would look the best for the tree line?  I am thinking the willow on the outside and the others to work a tree line on the inside.  My frontage is 200 feet and the depth of the property is 300. Also we put spruce trees in a trio on both sides of the house/drive what trees could I plant to compliment these??

Answer
The treeline is heavy on deciduous plant materials, so if winter wind is also a concern, I'd weave in some evergreens within the windbreak.  Is it functional or for aesthetics?  If you want what "looks best", I wouldn't plant them in a long row.  They'll just look like big corn.  Maybe stagger them into three off-set rows and mix the species up.  OR if you like the look of a "wall" of trees, go for it, as it is your home.

To compliment spruce, I like more course plants such as Iris, lilies, or perhaps Oregon Grape (depending on your climate zone)

By the way, your parcel is 1.38 acres  ~M