Last cut before winter- how short should you go?
Especially if you live in a colder climate, when winter approaches you may begin wondering how short your last cut should be. Cutting it too short - or too long - are both problematic. Here are some things to consider:
Cut higher? Lower? Stay the same?
States often post guidelines for what they recommend you to do in terms of lawn care and mowing. Unfortunately, some of the advice given is all over the place. Certain states will tell you to cut lower at the end of the season while many advocate not changing the height of your mowing at all. Yet sometimes these same sites recommend fertilizing practices that many would argue will kill your grass rather than encourage it to grow. It may be hard to have faith in advice like this when it is so inconsistent. That being said, most lawn care professionals feel cutting lower at the end of the season is the way to go.
How low should you go?
A three-inch cut is considered ideal for most grasses growing in cool seasons. These three inches mean the lawn can still have considerable photosynthesis. Lower than that and it may use up more of its nutrients faster, trying to regain its height while depleting the soil. This could contribute to more difficulties later. Three inches is also an ideal height for protecting the soil surface from the sun in the hotter months. If you tend to keep your grass even higher than three inches in the summer, you might consider slowly tapering down the height as the weather gets cooler until you're cutting it at three inches for the winter.
Why isn't longer better?
A three inch cut means the grass blades will stay upright properly. If it gets too tall, it begins to fall over and mat. When it reaches a matting stage, it is also shading itself, retaining moisture, and susceptible to disease harboring. When heavy snow sits in, you may see diseases set in and create "snow mold". Maintaining that airflow is important just like any plant, so leaving your grass taller than three inches before winter is not ideal.
How tall is your grass actually?
Another thing to keep in mind is what is sometimes called the "one-third rule". For example, grass that is cut at four inches is actually approximately five-and-a-half inches tall once cut. This comes from a rule of never removing more than one third of a lawn's total height in a single cut. For example, if you somehow let your grass get to seven inches tall, your instinct would be to cut it straight down - but you shouldn't. Instead, you should only cut one-and-a-half or possibly two inches for the first mowing, then wait half of a week to a week before cutting it again. Taking too much off at once will result in a shock to the grass that will affect its health and ability to flourish.