Summer is a maintenance season for lawns.
If spring lawn care is about getting your lawn healthy and green, summer lawn care is about KEEPING it healthy while temperatures soar and rainfall becomes a fleeting memory. It’s also about maintaining a lawn that can withstand all the barbecues, games, parties, and running feet that summer has to offer. Here are some tips for keeping your lawn in shape over those long, hot days of summer.
About Summer Lawns
After the spring growing season, summer brings quite a bit of stress to lawn grasses. Not only are the heat and drought damaging, but we aren’t as forgiving in the summer as we are in the winter. We want our lawns lush and green for outdoor activities, and we try to fight nature by continuing to fertilize, water, and coax new growth out of our lawns no matter what the weather. However, by understanding and respecting the seasonal changes of turf grasses, you can take steps to care gently for your lawn as the mercury rises.
- Warm-season grasses (including Zoysia, St. Augustine, Centipede, and Bermuda) like temperatures in the 70s.
Once temperatures get into the 80s and above, lawns will begin to struggle a little, with cool-season grasses having the hardest time. Growth will slow, color may fade, and lawns will show signs of wear and tear as they are less able to recover from stress and traffic. Some cool-season lawns will even go dormant in the summer, looking brown and brittle until early fall.
If you are unable to water regularly, allow your lawn to go dormant.
- Either water your lawn regularly and deeply, or don’t water at all. Don’t let your lawn go brown and dormant, then try to “water it back to life.” If your lawn goes dormant in summer, it should stay that way until fall – don’t worry, it should recover once the weather changes.
Small tuna cans make a good temporary water gauge.
- Keep mower blades sharp. Make sure your mower is cutting your grass, not tearing it, to minimize stress during hot temperatures.
Mowing higher means mowing more often.
Don’t Over Fertilize
If your lawn is looking straggly in midsummer, resist the urge to fertilize. In fact, it’s best to stop fertilizing about 30 days before your area’s summer temperatures arrive. Applying extra fertilizer in the heat of summer can burn your lawn and create a flush of tender growth that will struggle in the hot summer weather. Never fertilize dormant lawns – wait until they green up in the fall.
Organic packaged fertilizers are becoming more widely available.
By summer, many lawns begin to show signs of wear, especially in a few popular pathways. Consider installing stepping stones to minimize damage to your grass, and try to minimize traffic on dormant, brittle lawns. If you’re getting plenty of rainfall and your lawn is actively growing, you can apply a bit of fertilizer to these areas to help the blades recover faster.
Summer is the season to get those growing weeds removed before they bloom and disperse seed for next year. Targeted postemergent herbicides are designed to kill broadleaf weeds without harming turf grass, but they must be applied when temperatures will be below 85° F for a few days. Keep in mind that during the heat of summer, ANY product can be damaging to already-stressed lawn grasses, so use sparingly or hand-pull weeds instead.
Use weed control products when temperatures are under 85 degrees F.
Insects and Diseases
- Grubs will begin hatching in your lawn over the summer. If grubs typically cause problems in your lawn, you can begin applying grub control around midsummer.
Use insecticides only if you have severe lawn damage.
- Proper Mowing Techniques
- How to Control Weeds in Your Lawn
- Low Maintenance Lawn
- Lawn Diseases (North Dakota State University)
- Insects and Your Lawn Go Hand In Hand (american-lawns.com)