In addition, mulches add organic material to the soil and conserve water. Planting living mulches Living mulches are fast growing plants that don't allow the weeds to become established. The cash crop grows among the living mulch. A flame thrower is a propane tank with a nozzle attached that allows the farmer to control the flame. While a flame thrower is most effective on young, small weeds, it may also work on tough, larger weeds.
Farmers can use flame throwers to control both annual and perennial weeds.
Rotating crops Crop rotation is one of the most effective and common methods to control weeds. Cover crops, which suppress weed growth, are rotated into the planting schedule. For example, rye can be planted in the fall and then mowed down in the spring. The farmer can then plant a cash crop in the field, and annual weeds should not be as much of a problem. Selling the weeds Some weeds can actually be sold as a cash crop.