Q: I have a 25-year-old podocarpus on the north side of the house. It gets morning sun and afternoon shade. Every spring I apply chelated iron, but the last few years it hasn’t seemed to help much.

Thomas Leo Ogren’s war on allergy-triggering plants spans almost three decades. Ogren has seen grown men laid low by a sniff of a flower, taken chain saws to allergenic male yew pines, and burned out ...

Pacific yew, Taxus brevifolia, is a fairly rare North American softwood tree, found in southern Alaska, British Columbia, Oregon, Washington, central California, and the western slopes of the Rockies ...