For decades, forestry companies in B.C. have used chemical herbicides like glyphosate to kill off plants that might compete with trees destined for timber. Trembling aspen, named for its almost heart-shaped leaves that seem to quiver in the wind, is often on the hit list. But after years of destructive wildfires that have wiped out whole neighbourhoods and sometimes whole towns, more and more people are questioning the wisdom of killing off this tree. Because when wildfires sweep across the landscape, aspen can help calm the flames… “Anytime we apply herbicides, we are changing potential fire behaviour,” wildland fire ecologist Robert Gray explains… in areas where aspen and other deciduous trees are killed, a natural fire break is lost too.