first ....see link ... read the chart part about growth per year ... what we call ANNUAL GROWTH ... that is how you determine how tall something will be in 10 years ... and you may presume it will be double that in 20 years .... almost all size estimates are at 10 years... in the conifer world..... read now ..

http://conifersociety.org/conifers/conifer-sizes/

so the issue is... is will a DWARF plant stay within your confines for the period needed ... if not... you would want to search out MINI plants...

unless you have premier nurseries in yoru area ... most of us use mail order ...

after you wrap your head around all that ... then we could have a better conversation about what you want to do.. and how to go about it ...

in the PNW ... you are home to many of the premier commercial growers ... if you are interested in car trips .... you could be in nirvana in your collecting ... below is a link to how i used to do it in my area ...

ken

https://www.youtube.com/watch?v=WZ3zZ-aWi6U

Ken,

Thanks for the info. It really clarifies things.

I believe the optimal solution for me would be a mini variety that's been at its mature size for 5-6 years (this is for the "forest" and the two trees around the window).

For the first tree that I mentioned to resemble Christmas tree, it would be great to find an applicable dwarf that has reached its 10 year 6 feet tall mark.

Thank you very much for your help!

Mike,

Your conifers look very nice. I can't exactly tell from the picture their size, but it looks something like I was envisioning.

Sorry, can't get a picture right now, since I'm not home. But regarding sung exposure: the "Christmas tree" will be in full sun, the two trees by the window are east facing, sun leaves that area in the afternoon after being blocked out by structures, and the "forest" will be in shade, pretty much entirely. I would say the soil at the second two locations is sandy, maybe some clay mixed in (loamy?). The first location is more like black topsoil. Gets vegetated really fast.

Thanks

Picea omorika 'Nana'.

Picea glauca 'North Star' would be close to your requirements. Dark green foliage, dwarf habit, and narrow conical in form. Very much has that Christmas tree look but overall smaller stature. My guess is that at some point far down the road you would have to do some light pruning each year if you wanted to keep it at a particular size.