Cut the bottom out of a large plastic pot. Use heavy shears or a stout knife to cut the bottom out. The pot should be 12” (30. 5 cm) or more across and at least 8” (20. 3 cm) deep. Bury the pot where you want the grass. Center the grass in the pot. Use soil from the hole you dug to sink the pot to fill the pot. Use a cement drain tile, metal culvert section or plastic drain tile without perforations buried in the ground to confine the grass roots if you don’t have a large plastic pot. Set pots or other items confining roots into the soil so that you leave about 1” (2. 5 cm) of the rim above ground. Every few years you will need to lift the container and divide the grass plant to keep it from becoming root bound or breaking the container.
At the edge of the area where you wish to confine the grass dig a trench 6” (15. 2 cm) across and 8” (20. 3cm) deep. This air gap generally prevents rhizomes and stolons from crossing. Mow the edge of moat frequently in case the grasses manage to cross it.
In early spring burn or cut off the dried grass leaves from the previous season if you did not do it in the fall. Wait for new grass shoots to begin growing. When the new shoots are still small dig around the whole clump of grass. Spread a tarp or sheet of plastic on the ground. Lift the clump of grass and place it on the tarp or plastic. Using a pruning saw or a chain saw simply cut the grass root clump into chunks. You can quarter it or make more or less cuts depending on the size of the root system. Replant what you want of the smaller root pieces and give the rest away. Discard the center of the old root system if it has no new grass shoots growing from it. Some clumps die out in the center.
Grasses won’t grow as much if you skip the fertilizer and water only when it’s very dry. If the plant’s growth yellows or looks spindly you may need to resume watering and fertilizer.
