Planting trees for the next century
I have been working on my front yard and am about to start planting some trees. I would like to plant some trees that within 20 years gives my south facing house some decent shade and in 100 years extreme shade. I was thinking of planting 3 permanent(meaning 300+ years, nothing is permanent in nature) trees.
Northern Red Oak
Attached is a plan I did in google sketchup that shows trees canopies when they are mature.
My research says the Bur Oak will get a 60 foot canopy, the Ginko Biloba will get a 30 foot canopy and the Northern Red Oak will get a 50 foot canopy.
First off, are my numbers correct for my zone? Second, looking at the plan, am I too close to my house or the street? I spaced the trees at least 4 feet from the sidewalk.
Also, to get me some shade until the Oak trees fill out, I planned on planting some fast growing trees closer to my house that I will cut down in 20 years or so, was thinking a variety of the Ginko Tree that grow tall but narrow.