What is good weed killer that does not effect plants?

A good weed killer that doesn't affect desirable plants is a selective herbicide, such as those containing ingredients like 2,4-D or dicamba. These products target broadleaf weeds while leaving grasses and many other plants unharmed. Alternatively, natural options like vinegar or boiling water can kill weeds without impacting nearby plants, although they may require more frequent application. Always read labels carefully to ensure safety and effectiveness.