Hardy, Thorny, Weed ID

We live in Toronto and spent our summer abroad this year. When we returned, we found an enormous (some 6 ft high), thorny, shrub- or tree-like weed growing in our back yard in partial sun. We are planning to remove…

Tree of Heaven

Dear Master Gardeners, I manage some “garden zones” on my apartment buildings property; the particular garden zone of concern is a giant concrete planter that a “weed tree” has unfortunately infiltrated. It seems to have grown an underground network. I…

Black Walnuts Popping Up All Over The Place

Dear Master Gardeners, I’m a volunteer gardener at my Toronto apartment building. The problem that I’m going to tell you about is situated in a large concrete planter which hugs the side of my building; the planter is quite large;…