I don't even use weed and feed. I put down triple 13 in the spring and again in the late fall. It makes everything grow. The grass gets so thick after about two mowings, the weeds are gone.
Triple 13 is also known as 13-13-13. Equal parts nitrogen, phosphorus, and potassium.
For weeds and grass kill... Compare N Save Concentrate works well on fence line and gardens. Careful using anything in your mulch. If any is active when you use it for planting, it may kill the plant.