Which of the following methods can help manage perennial weeds?

Regular mowing practices are an effective method for managing perennial weeds because they help disrupt the growth cycle of these plants. Perennial weeds often have established root systems that allow them to regrow after being cut back. By mowing regularly, you can prevent these weeds from flowering and seeding, which reduces their ability to spread and proliferate in the area.

Additionally, consistent mowing can weaken the weeds over time by depleting their energy reserves and preventing them from photosynthesizing effectively. This method is particularly effective in maintaining the health of the desired turf or ornamental species, as mowing can encourage them to grow more vigorously, ultimately outcompeting the perennial weeds. It's important to mow at the correct height and frequency to maximize the suppression of weeds while promoting healthy lawn or garden growth.

While other options listed might have their own benefits in specific contexts, they do not contribute as directly to managing perennial weeds as regular mowing does.