Feed the grass plants lawn fertilizer accord to the directions on the label. Feed the grass only during its growing season so that the grass has a chance to use the fertilizer. Feeding grass plants while they are dormant causes an explosion of weed growth.
Keep the soil evenly moist while germinating grass seed or establishing grass-plant roots. This reduces stress on the plants caused by lack of water. Once established, most grass varieties will need water only during hot, dry weather.
Mow the grass down to the recommended height for the variety with a lawn mower or trimmer. This stimulates new grass plant growth. Ornamental grass is cut down to a couple of inches tall in the spring to make room for fresh, vigorous growth.