Think of grass plants like hair
It grows from the roots, but people always cut it like it grows from the ends!!!  UGH

Many want to trim their wildly growing grasses during the "clean-up" time in the fall. You can - but not like this! 
If you can wait, prune in February, just before spring growth. But, if you must do it in the fall, follow these tips!

Use:  Sharp, Clean Tools!!!  Thick gloves and a bungee cord or string to tie the plant up for easier cutting.

1.  Use loppers first for larger cuts, then use pruners for shaping or smaller cuts.
2.  Prune as close to the ground as possible. The lower to the ground, the sooner the new growth will appear.
3.  To clean up smaller or evergreen grassy plants (fescue or oatgrass), Run your gloved hand through the plant, combing to remove dead leaves. Trim away dead undergrowth. Use this method for sedges as well.  You can prune these plants the same as grasses, but they only need it about every 3 years.

Pampas Grass - The King of Grassy plants,! 
This showy display in the late fall gives color and animation to an otherwise dreary season.  The colorful plumes sway in the wind and later disappear to expose the large evergreen mound until spring arrives. 

The stately appearance of this fast-growing plant can get quickly out of hand in size, growing 10-15 feet tall and spreading 6 to 10 feet wide. This is perfect when used on a border or as a main landscape feature, but will become impossible to divide or move without a backhoe, so choose the location wisely.  

Ideally, water that falls from the sky would go into the ground and nourish the plant life. The perfect balance. However, this is increasingly rare, especially in cities. As populations grow, construction methods are such that ground clearing removes the porous layers that would absorb surface water. Piping and ditch systems are created that “collect and send” water to another location. In storms, these systems become over-taxed and cannot handle the volume and flow of water. Flooding can, and frequently does, occur. Rural areas are better, but compact ground, hilly terrain, clay layers and subsurface hardpan keep water from infiltrating into that ground too, the result being mucky muck in the winter and hard-as-a-rock clay in the summer. Neither allow water to infiltrate. To get the water into the ground is to make the ground more absorbable. A very popular, inexpensive and relatively easy way to do this is with recycled cardboard. Cardboard works because it prevents photosynthesis so weeds don’t grow, it helps absorb & retain moisture, and the cardboard decomposes and adds ‘fluff’ to the hard ground, making space for water to ‘go in.’  I have used this method for more than a decade, in muck and clay, with great success. Here’s a really good example of how to do it.