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    The Best Time to Fertilize Your Lawn

    Fertilizing your yard too often can harm grass roots and leave lawns scorched

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    Aerial view of person mowing their lawn.
    Maintaining a lush lawn comes down to fertilizing and watering only when the grass’ growth calls for it.
    Photo: Getty Images

    Fertilizing provides the nitrogen that grass needs to better withstand pests and extreme heat and cold, but fertilizing more doesn’t always make your lawn better. In general, you don’t want to fertilize your lawn more than twice yearly, according to Frank Rossi, associate professor of horticulture at Cornell University’s School of Integrative Plant Science.

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    Overfertilizing can damage roots and cause scorching, leaving grass brown and patchy. Underfertilizing, though, can make grass less pest- and disease-resistant.

    The Best Time to Apply Fertilizer

    Rules of thumb for fertilizing don’t apply to every lawn, because weather conditions and grass cycles can vary depending on where you live. Follow these tips when deciding when to fertilize your lawn.

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    Observe your lawn’s growth. The right time to apply fertilizer is when the grass is growing more roots than blades. “If your lawn looks thin, late summer and early fall is usually the best time to feed roots more than leaves,” says Rossi. If you only fertilize once a year, do it in September using fall fertilizer. Most high-quality fertilizers contain slow-release nitrogen, which promotes growth in the spring.

    Consider your region. In the Northeast and Northwest, the right time to fertilize is typically in the fall. In the South and Southwest, it’s typically in the late spring. 

    Be aware of the forecast. Fertilizing very wet soils may cause runoff, so skip applying fertilizer when you know a big storm is nearing.

    Other Lawn Care Tips

    In addition to fertilizing your yard, mowing and watering in the right fashion will also make your lawn lusher. Here are three key lawn care tips:

    Let your lawn grow. Generally, you should let grass grow to 4½ inches and then cut it to 3 or 3½ inches. Tall grass helps promote deep roots, making your lawn hardier and more resilient. 

    Use the mulch setting on your mower and leave the clippings behind. The mulch clippings serve as compost, providing your grass with nutrients. This also reduces evaporation.

    Don’t overwater. A typical lawn needs no more than 1 inch of water a week, including rainfall. To promote deep roots, give your lawn one long soak each week instead of several short waterings. In fact, a light daily watering encourages root systems that are too shallow, promotes weed growth, and leaves grass susceptible to disease and insect damage.

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    Our ratings of outdoor power equipment include almost 150 lawn mowers, over 80 leaf blowers, and 70 string trimmers. Here are three of the best.


    Mary H.J. Farrell

    As a senior editor at Consumer Reports for more than 15 years, Mary H.J. Farrell reported on all manner of vacuums and cookware, as well as microwaves, mixers, freezers, and fans. Starting in the mid-1990s, she held senior positions at People.com, MSNBC, and Ladies’ Home Journal. One of her earliest jobs was at Good Housekeeping.