Why Watering More During a Heat Wave Can Hurt Your Landscape
- Dennis Realmuto
- Jul 9
- 2 min read
When temperatures climb into the 90s, the instinct is almost always the same.
Turn the sprinklers on longer.
After all, if you're hot, your lawn and plants must be thirsty too.
The problem is, landscapes don't respond to heat the same way people do. In fact, one of the most common mistakes I see every summer on Long Island are homeowners watering more simply because it's hot.
Heat Doesn't Always Mean Your Landscape Needs More Water
A lawn can look stressed during a heat wave for several reasons.
Sometimes it needs water.
Sometimes it's reacting to high temperatures.
Sometimes the soil is staying too wet, leaving roots without the oxygen they need.
From the surface, those situations can look almost identical. That's why simply adding more water isn't always the answer. After nearly 50 years walking Long Island properties, I've learned that the same symptoms can have very different causes.
Overwatering Creates Problems You Can't See
Most of the damage from overwatering happens underground.
Roots stay saturated longer than they should. Soil compacts. Air disappears from the root zone. Plants become more vulnerable to disease and stress, even though they've been getting plenty of water.
Ironically, plants often decline not because they received too little water, but because they received too much at the wrong time. By the time leaves begin yellowing or plants start struggling, the real problem has usually been developing for weeks. Healthy landscapes depend on water moving through the soil, not sitting in it.
Every Property Handles Heat Differently
There isn't a summer watering schedule that works for every property. Sun exposure, shade, soil type, drainage, slope, mature trees, and even the way neighboring homes block afternoon sun all affect how quickly moisture is used. That's especially true on Long Island, where conditions can change dramatically from one neighborhood to the next.
The goal isn't to water more.
The goal is to water correctly for the conditions your property is actually experiencing.
Smart Irrigation Still Needs Smart Decisions
People often assume that installing a smart irrigation controller means everything takes care of itself. It's a good tool, but it's still just a tool.
Weather stations don't know your soil. They don't know how much shade your oak tree creates in July or that a planting bed was redesigned last spring. They don't know where water lingers after a thunderstorm.
That's why we continue adjusting systems throughout the season. Landscapes change, and irrigation needs to change with them. A system that's working perfectly in May may need different settings by August.
A Healthy Landscape Isn't About Using More Water
It's about using the right amount, in the right place, at the right time.
When irrigation is designed around how your property actually behaves, plants develop stronger root systems, lawns stay healthier through stressful weather, and water goes where it's needed instead of creating problems elsewhere.
Hot weather doesn't automatically mean it's time to water more. Sometimes the best thing you can do for your landscape is resist that instinct and trust the experience of your irrigation and drainage professional.
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