I planted several Alberta spruce at a small size. I have watch them grow and was so pleased with them. Now that they are what I think is full grown they have started to look badly with big area's that are bare. When we first saw this we thought it was due to a winter burn.The following winters we have wrapped in burlap and still see the same problem. This year we took the advice of someone and did not cover them. Right now 3 look like they should be taken up(sad) 2 others are not quite as bad. I fertilizedd every spring with a shurb (acid) fertilizer.Will they ever come back? What did I do wrong? I have been told now that they are big they are too close to a building it is a cirulation problem. I would like to hear from anyone who can help in any way.