How to Mow Grass for Optimal Growth in Spring 
Fred Newcombe

We’re in the swing of spring! As you dust off your mower you may be wondering how to mow grass to optimize growth and reduce stress on your turf. Unfortunately, this practice is often mismanaged. Dial in proper mowing protocol this Spring and see results.

Reduce Stress on Turf

Firstly, it is important to recognize that mowing causes stress to the turf grass. Mowing removes tissue from the grass blade that would otherwise undergo photosynthesis. During photosynthesis, the chlorophyll in grass blades capture energy from sunlight and use it to convert carbon dioxide and water into glucose and oxygen. Then, glucose is stored in the plant’s cells and used as a source of energy. As a result, mowing reduces the energy store for the grass plant. To help minimize stress on your lawns and fields, reference these 7 guidelines for how to mow grass this spring.

  1. Mowing Height

This Spring, mow high to perform a “clean-up cut” and encourage turf to stand up straighter. Then, lower your height of cut to 2.5 inches for the first couple of cuts to encourage lateral growth. Slowly raise cut to 3.5 inches by mid-May. Residential lawns may be maintained at 3 – 3 ½ throughout most of the season. During extreme heat, consider maintaining a HOC of 4

  1. How to Transition Your Mowing Heightgraphic showing to only cut the top third of turf grass when mowing

Cutting your grass too short can weaken the turf and make it more susceptible to stress, diseases, and weeds.  Don’t remove more than one third of the grass height in a single mowing. Do not trust the settings on the mower deck to accurately reflect the actual height of cut (HOC). Keep in mind that tire pressure and weight of the operator (if it’s a ride-on mower) will affect the height of cut. So…measure!

  1. Mowing Frequency

Adjust your mowing frequency according to the growth rate of the grass. You may need to mow more frequently during periods of active growth. Conversely, during slower growth periods, you can mow less often. Typically, weekly mowing is suitable for most residential lawns, especially if a HOC of 3 – 3 ½” is being maintained.

  1. Sharpen Mower Blades

Ensure that mower blades are sharp. Dull blades can tear the grass and create an uneven and ragged appearance. Consequently, turf will have a brown cast to it. Cutting with dull mower blades will increase the likelihood of disease, decreased photosynthesis, and increased water loss. Therefore, clean and sharpen blades regularly (minimum every 24 hours) to achieve clean precise cuts.

  1. Lawn Clipping Management

Leaving grass clippings on the lawn—known as grass cycling—can provide valuable nutrients and organic matter back to the soil. In an organic lawn, grass clippings will not contribute to thatch. Rather, the active, healthy biology in the soil will help it break clippings down. If the clippings are excessive and clump together, consider using a mulching mower, double cutting, or disburse them to avoid smothering the grass.

  1. Alternate Mowing Patterns 

Be sure to change the mowing pattern each time you mow. This helps prevent soil compaction and ensures an even cut. Vary the direction, such as mowing north→south one week, east→west the next, and on a diagonal the following week.

  1. Avoid Mowing in Wet Conditions

Mowing wet grass can lead to uneven cuts and damage the turf. Ideally, mow when the grass is dry to achieve a cleaner cut and minimize soil compaction.

Practical Approach, Proven Products

These are general guidelines to provide a guide to mowing. Also, be sure to consider: usage, site conditions, seasonal variations, and grass types while developing your mowing practice. One size does not fit all when it comes to proper mowing protocol. 

PJC emphasizes the importance of combining our practical approach with proven products. Our practical approach is built on well-implemented organic turf care practices, one of which is mowing. Our proven products include all-natural, organic fertilizers and soil amendments. Don’t rely solely on our blogs for information, email us to learn about how we can help you implement organic turf care successfully.

Don’t just take it from PJC,  See what the universities are saying about mowing protocol:

          Michigan State University MSU Extension, Mowing Lawn Turf

          UMass Extension Turf Program, Lawn Mowing

          Cornell College of Agriculture and life Sciences, Sports Field Management Mowing