Here, we spoke to tree experts and got answers on when you should trim specific types of trees—from apple to pine and everything ... is generally active from April to November.

Pine trees also were planted in the shape of the ... “I was in North Park in April using my drone to make a video featuring the water tower,” he said. “So when I heard there was some ...

This story appears in the April 2015 issue of National Geographic ... From valley bottoms all the way to the tree line, nearly every single pine has been killed by an enemy smaller than a ...