Which cultural method is effective in controlling tall weeds?

Mowing is an effective cultural method for controlling tall weeds because it physically removes the weed's vegetative growth, preventing them from reaching maturity and setting seeds. By regularly mowing, you can reduce the height of the weeds, which limits their ability to photosynthesize and ultimately weakens them over time. Additionally, consistent mowing can encourage the growth of desirable plants by reducing competition for light and nutrients.

The other cultural methods listed are less effective in directly managing tall weeds. Watering, for example, may inadvertently promote weed growth as many weeds thrive in moist conditions. Fertilizing can provide nutrients that both desirable and undesirable plants can utilize, potentially worsening the weed issue. Mulching, while beneficial for suppressing some types of weed growth by blocking light, may not be as effective against tall weeds that are already established and can grow through mulch layers.