How to Mow a Lawn and 5 Common Mistakes You May Be Making (2024)

Mowing the lawn is one of the most common—and frequently done—landscaping chores. Even if you're more of a hands-off gardener, chances are you still have to rev up your mower regularly.

Properly caring for your lawn involves a bit more than just pulling your lawn mower out once a week and running it across your yard. There are a few common mistakes to avoid to have the healthiest grass and a beautiful lawn each time you mow.

1. You Mow Your Grass Too Short

It may seem like mowing the lawn shorter would mean you can get away with this task less frequently, but this can do more harm than good. Each blade of grass is part of a plant that gets its nutrients partially from photosynthesis. Mowing the yard too low reduces the amount of leaf surface available to soak up the rays, so you may end up with a patchy lawn, damaging or even killing your grass. Short grass also makes it easier for weeds to move in and take over.

Instead of mowing the lawn super short, keep your lawn mower blade high and mow frequently. As a rule of thumb, you should never remove more than one-third of a blade of grass in a single mowing. If your grass has gotten tall, mow as high as you can, then a few days later, mow the yard again a little bit lower rather than waiting another week. Grass clippings should always be less than 1 inch long.

How short you mow your lawn also depends on the season. Yards can be cut a little lower in the spring and fall when the weather is cooler. In summer, keeping the height taller allows the blades to shade their roots and provides an extra leaf surface to fuel them.

Experts have raised their recommendations in recent years for mowing heights between 2 and 3.5 inches, depending on the type of grass. Cool-season grasses—Kentucky bluegrass, tall fescue, and perennial ryegrass—can generally be cut to 2.5 to 3.5 inches. Warm-season grasses that grow horizontally—such as zoysia and Bermuda—can be mowed down to 2 to 2.5 inches.

2. You Collect Your Lawn Clippings

Removing grass clippings while mowing the lawn with a bagging lawn mower is tempting, but doing so will rob your lawn of valuable nutrients. Here's why: Grass blades are primarily composed of water (about 85%) and also include nitrogen, so they break down quickly and add nutrients to the soil, allowing you to use less fertilizer. If you already have a bagging lawn mower, you don't need to buy a new one—you can remove the attachment on most models.

Another common misconception is that grass clippings cause thatch, a layer of partially decomposed grass roots and stems that can build up between the soil surface and the growing grass. However, if your clippings stay under 1 inch in length, they won't cause this problem. (though if your lawn already has thatch that's more than ½ inch thick, grass clippings can contribute to the problem). If thatch is an issue for your property, you can rely on power raking, verticutting, or core aeration in the spring or fall to open up more space for the roots.

To prevent grass clippings from making a mess, keep them away from hard surfaces such as streets and driveways. when you're mowing the lawn. If they're sitting on concrete or another hard surface, they can be swept into storm drains and clog them or affect water quality down the line. Grass clippings contain phosphorus, a nutrient that turns lakes green with algae, and chemically treated decomposed clippings can also pose a threat to fish and other wildlife.

3. You Don't Switch Directions Each Time You're Mowing the Lawn

If you're always mowing the lawn in the same direction, eventually, your grass will start bending that way. Changing the pattern each time you mow will eliminate this issue and decrease soil compaction. Alternating directions, either at right angles or diagonals, can also help control creeping grass runners and reduce thatch development.

4. You Mow Wet Grass

Here's a golden rule of lawn care: Never mow your grass when wet. For starters, it's a lot messier than mowing the lawn when it's dry—nobody wants wet grass clippings sticking to everything and clogging your mower's blades. Wet soil is softer than dry, so your mower may pull the lawn's roots out of the ground, leaving you with patchy, dead areas. Dry grass takes less time to mow, cuts easier, won't clog or mat, and looks better when you're finished. It's also safer to mow on dry grass because there's less risk of slipping (especially on slopes) and getting injured by the mower.

5. You Don't Sharpen Your Lawn Mower's Blades

If you notice that your lawn mower or lawn edger isn't getting the job done as well as it used to, try sharpening the blades. Just like kitchen knives, mower blades can become duller with each use, resulting in grass that gets "torn" instead of "cut." These ragged edges will look bad, and they can also invite diseases or pests in through damaged areas, so it's worth taking the time to sharpen the blades at least twice a year. You can do it yourself with just a wrench and a medium file or a sharpening power tool. Experts recommend changing the blades of robot lawn mowers at least once per mowing season.

When to Call a Professional

If you’re not naturally blessed with a green thumb, or simply don’t have the time to properly take care of your lawn, then having an experienced gardener coming to your home on a weekly or biweekly basis may be the option for you. However, even if you mow your own lawn, there are certain situations where a professional is needed:

• If, despite your best efforts, you keep seeing dead patches, overgrown weeds, or ill plants, and pests
• If your soil isn’t healthy to the point of getting dry grass
• If you have a landscaping budget for a project
• If you don’t know how to aerate the lawn.

When in doubt, give the pros a call so you can keep your lawn in tip-top shape year-round.