Wheatgrass is highly nutritious and frequently grown by the health-conscious, juiced and consumed daily. When the blades of wheatgrass are removed frequently, it grows back continually and supplies a consistent supply of nutrients. But when left unattended, wheatgrass will quickly decay or become moldy. The wheatgrass blades can still be removed and consumed--above the molded section. But it is better to remove the entire plant and start fresh with a new crop of wheatgrass or some other plant.
Wait to remove wheatgrass blades for consumption when they have turned a vivid green and reached 7 to 8 inches in height.
Trim the wheatgrass to about a half-inchabove the surface of the soil (or above the molded area) with a pair of sharp kitchen scissors. Harvest the oldest unharvested blades first. Rinse the blades thoroughly before consuming them.
Remove wheatgrass permanently with a sharp hoe before it seeds. Dig up the soil underneath the wheatgrass to a depth of 3 inches. Remove any clumps of wheat grass and roots that you uproot. For larger areas of wheatgrass, a rototiller may do the job more quickly.
Spray the wheatgrass with a liquid, glyphosate-based herbicide prescribed for use on grasses. Thoroughly wet the grass with the spray and allow it to absorb for 48 hours. Physically remove the wheat grass three weeks later before tilling the area.