Q. (My) birch tree, planted many years ago, has never really grown full. In the spring, it will get tiny green leaves but (it’s) still very airy and not full foliage. We’ve been told not to prune it.

The time has finally come. Get your boots, gloves, thick pants and heavy coat — and don’t forget your warmest hat. Before you walk outside, grab a pair of sunglasses. You’ll need ‘em. Why? Because you ...