Summer Lawn Care in Annapolis: What to Do (and Avoid) in the Heat
Maryland summers are tough on lawns. Heat, humidity, and our clay soil put cool-season grasses like tall fescue under real stress from June through September. As a local landscaping company, here’s how to keep your Anne Arundel County lawn healthy through the heat — based on University of Maryland Extension guidance, not guesswork.
Raise your mowing height
Mow tall fescue to about 3 inches, and raise the mower to its highest setting (around 3.5 to 4 inches) during hot, dry stretches. Taller grass shades its own roots and the soil, holding moisture and crowding out weeds. Never remove more than one-third of the blade in a single mow, and if the lawn isn’t actively growing during a dry spell, don’t mow it at all.
Don’t fertilize now — this is the biggest mistake
It’s tempting, but summer is the wrong time to fertilize a cool-season lawn. Feeding tall fescue in the heat stresses the grass and feeds weeds and disease instead. Wait until September, when cooler weather returns and the lawn can actually use it.
Water deeply — or let it go dormant on purpose
You have two valid choices. Keep it green by giving the lawn about 1 inch of water per week (rain included), watering deeply and infrequently, early in the morning. Or let it rest: an established tall fescue lawn can go dormant and turn brown in summer. That’s a survival strategy, not death, and it will green back up when cooler temperatures and rain return in fall. The one rule is simple: don’t bounce back and forth. Pick one approach and stick with it.
Leave the clippings
Grass clippings are free fertilizer. Left on the lawn (a practice called grasscycling), they don’t cause thatch buildup. They break down and return nitrogen to the soil. Skip the bag.
Watch for brown patch
Brown patch is the classic Maryland summer lawn disease. It shows up from June through September when daytime temperatures hit the mid-80s or higher, nights stay above 65°F, and humidity is high — exactly our weather. To limit it, water in the morning rather than the evening so the blades dry out, avoid summer nitrogen, and improve airflow. It mostly looks bad, and most lawns recover in fall.
Know your grub timeline
Japanese beetles emerge in central Maryland in mid-June and peak in early July. Their eggs hatch into grubs that feed on grass roots, and the damage often shows up in August and early September, when patches of turf can pull up like a loose rug. If you had grubs last year, now is the window to plan control. Not every lawn needs treatment, so scout before you spray.
Want your lawn handled by people who know Maryland summers?
We provide professional lawn and landscape care across Annapolis, Arnold, Severna Park, Edgewater, and Pasadena — mowing, seasonal treatments, and the fall renovation that makes the biggest difference. Call (410) 271-6969 or get in touch for a free quote.
