One of the most difficult and unpleasant jobs in gardening is dealing with weeds in a newly planted area of the garden. They pop up everywhere. And they keep doing it. Some weeds one can just pull up. But others tend to linger. The easy-pull weeds tend to be easily eradicated from the garden, but the ones that you pull up over and over again tend to be a real aggravation. Perennial grasses are an example.