Indigo Cambium Biodegradable Carrier for Woody Weed Herbicides 20LCambium is a biodegradable diesel replacement for use in combination with woody weed herbicide technology when conducting Basal Bark and Cut Stump operations. The active ingredient in Cambium is Methyl Oleate (Canola Oil Methyl Ester), a lowly toxic, naturally derived solvent and carrier which assists herbicides to penetrate woody weeds more effectively. When used as per label directions, Cambium poses a much lower hazard for the user and the