Never too late. Some claim that during spring green up it'll push out the cuts, but I've killed a bunch of sweet gum in early spring. I generally use the Harper mix, Garlon 3, water and Polaris AC. But I've also used Triumph (generic Tordon RTU) and recently tried some 20% Imazapyr in water on Chinese Tallow trees. Need to go back and verify that it's working.
