Organic agriculture finally renounces the use of herbicides. Taking into account the positive qualities of weeds, the aim is not to their complete elimination, but to reduce the available quantity, which is not harmful to yields. With these prerequisites weed control on the non-chemical way is becoming more important as a major place occupied the variety of crop rotation and other indirect ways to control the weeds. For their regulation by a non-chemical route in practice farmers use appropriate machines and devices and therefore pay particular attention to the mechanical implements, automatic systems and thermal control of weeds. In organic farms for vegetables use also cultivators with automatic diverting knives and cultivators with automatic rotating knives, controlled by video cameras and sensors. Robotic machines for weed control have also been developed in recent years, controlled by GPS agricultural navigation.