To trim monkey grass, use gardening shears or hedge trimmers to cut off any dead or overgrown parts of the plants. The grass can be trimmed as often as necessary, or when it looks untidy.
Be sure to keep it at the desired height. Trimming the grass too often, however, can have a negative effect, causing it to thin out and become less vibrant. To get the best results, trimming should be done at least once per season.