Treed area = shade house?

I am a newbie when it comes to shade houses. I plan to propagate a lot of plants/trees and I've been advised that I will need one in the area I am moving to.

If the idea of a shade house is simply to grow seedlings in the shade, there happens to be a cluster of mature pine trees next to my house site and I am wondering whether these will do much the same job as a shade house? It's quite easy to walk around underneath them, and it's not totally shaded - a small amount of dappled light tends to get through their foliage.

What do you think? Am I missing something?

....anyone?

hi,

I often place seedlings in shade of trees, bushes, tall weeds for protection
the only differences i see between an official "shade house" and outside in the shade is
how to get water to them
critter protection
also a greenhouse/shade house would also extend the growing season allowing you to start your plants earlier
I don't see why you couldn't, at least at the beginning,
use the shade of the pines to start some and see how it goes