i ordered 10 sweet sap silver maples from st lawrence nursery a few days ago. they are suposed to have 3 to 5 percent sugar content and grow to tappable size in 8 to 10 years, sounds hard to believe but i will know in 10 years i guess! anyhow what would be proper spacing for planting trees so they arnt so crowded together or too far apart, i am planning to plant a few along the edge of a roadway and a few in a sidehill area that just has grass growing in it