A broad-spectrum herbicide, Roundup controls most weeds and grasses, but it also kills desired plants in a flower bed unless applied with care. Roundup contains glyphosate, which is toxic to plants. Glyphosate travels through plants from their leaves to their roots.

What can I use to kill weeds but not my flowers?

A mixture of one cup of salt dissolved in 2 cups of hot water will also work. Some gardeners spray with full-strength apple cider or white vinegar, but rain dilutes their effectiveness. Be careful not to get any of these on your grass or the desirable plants in your borders and beds.

Will selective herbicide kill flowers?

A selective herbicide may be less effective, though for flower beds it is preferred, as it will only target certain weeds and grasses, and leave all other plants to thrive.