My white spruce has a lot of new growth on the top half of the tree, while on the bottom half there are only a few new branches, and they are really short (5x shorter than on the top). So the tree is getting very top heavy. This was the case last year as well.
I don't understand why it grows like this. Of course, the top half is exposed to more sunlight than the bottom half, but the bottom half should still receive enough light. All other spruces I see around here are conical, as they should be.
Why does my spruce have this weird shape? Is there anything I can do to encourage growth on the bottom half of the tree? A picture of the spruce is attached.