Don Kinzler answers questions about the best time to prune a rose bush and cross-pollination. He also gives a reader a recommendation for an evergreen tree that won't grow taller than 25 feet ...

End of winter is the best time of year to prune shrubs that flower later in the growing season, i.e. from mid-June and after. The reason is that later-flowering shrubs bloom on “new wood.” This means ...