MA, first of all I never raised Christmas trees, and am far from an expert on the subject, however we bought trees for many years from a man that did raise them, so I do know a little bit just from exposure to someone that did raise them.
If you want them to look nice, they have to be shaped once a year. Just planting them, and letting nature take it's course won't get you the best shaped, full trees. That part is the hard part of raising Christmas trees. Then there's the part after about 10 years, they are too tall to harvest, unless you just use the top of the tree, and throw the rest away. So from 6, to 10 years are when trees are big enough to use, but not too big to fit in a house with 8 foot ceilings. Maybe staggering the years you plant them would be most beneficial?
Lots of evergreens are subject to blights, so they can need spraying to keep the fungus in check. I got that piece of info from the guy we bought our trees from.
I've had real trees the majority of my life, some very close to perfect, and some that looked a little better than the Charlie Brown tree.....LOL
In summation, just like anything else that you plant, the better care you take of a crop, the better it is at harvest.
You tube has plenty of videos on the subject:
https://www.youtube.com/results?sear...tmas+trees+for
