Rototilling doesn't necessarily kill weeds. It churns them up, and some won't survive, but some will. Try not to use weed killer because it kills more than weeds.

Do you need to kill weeds before Rototilling?

Getting rid of the weeds in the garden area before planting makes your work easier and encourages healthy plant growth. ... Rototilling weeds into the soil is a quicker method and adds organic matter to the soil, too.

Does Rototilling lawn kill weeds?

A small tiller can be a life-saver (or at least a back-saver). Lightly till around plants and along paths to churn up the soil, exposing the weeds' roots to the drying sun. A light rototilling once every week or two will go a long way to keeping weeds from taking over your gardens.