You can spray roundup, killzall, honcho or any other version of roundup you find around the tree to kill grass and/or weeds. You can spray 2-4-d around the tree to kill your jasmine or anything else the weed/grass killer don't kill just don't weedeat or mow around your tree before spraying. .. don't want to bust the bark on the tree or roots before spraying 2-4-d. Roundup and the generic brands are for narrow leaf grasses and weeds where the 2-4-d is for broad leaf weeds, brush and even trees if applied correctly. If yall are having an issue getting grass or other things to grow under the Oaks you probably need lots of lime to correct the soil ph (the best way is take a soil sample to be tested). A good grass for under trees is carpet grass, is a native grass that does well in sun or shade and looks very similar to Augastine grass.
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