Which means that when they start a new project, make a new bed or a new garden, they do not get the existing weeds under control before they start constructing their new project. First I'll explore the organic methods. One of the most popular methods of organic weed control is cultivation either by hand or with a power tool such as a roto-tiller. Digging, chopping, and turning the soil can be effective if you are trying to eliminate weeds that typically grow from seed and have a single clump root system. Grasses do not fall into this category because they have roots know as rhizomes.
Rhizomes are horizontal roots than grow at, or just below the surface of the soil.
From these roots new plants sprout from the roots all around the radius of the parent plant. Digging, cutting, chopping or turning the soil when you have plants with this type of root system only helps the plant reproduce. You actually help to propagate the plant. You can still win this battle, but it requires true commitment. You have to cultivate the soil every few days, and remove any new vegetation that appears.