Answer: It depends on where the grass is in relation to the trees. Round Up is a contact killer and if you keep it on the grass but away from the tree trunks and leaves, it will kill the grass down to the roots but not translocate into the soil or travel down to the tree roots. If you're in doubt, you can use a flat shovel to get under the grass and slice under it, rolling it up as you go. Then dig out the roots and create your flower bed. Best wishes with your project!
Q&A Library Searching Tips