The 3 Worst Times to Fertilize Your Lawn, According to Experts by A&R Integrative Lawn Care Services
You do a lot to keep your commercial lawn looking lush and healthy watering, mowing, aerating, and pulling weeds whenever they pop up. Fertilizer can be a powerful tool in that routine, but timing matters just as much as what you apply.
While fertilizing at the right moment can help your grass thrive, fertilizing at the wrong time can do more harm than good.
Key Takeaways
- Avoid fertilizing during extreme heat, heavy rain, or freezing temperatures.
- Fertilize in the early morning or early evening when temperatures are mild.
- Spring and fall are the best seasons to fertilize for long-term lawn health.
Does Everyone Need to Fertilize Their Commercial Lawn?
Fertilizing isn’t mandatory, but most lawns benefit from it, especially if you want thick, green, evenly growing grass.
“Fertilizing means feeding your grass essential nutrients like nitrogen and potassium to supplement what the soil provides,” explains Maggie Reiter, lead scientist for Sunday. As grass grows, it naturally uses up nutrients in the soil, and fertilization helps replenish them.
The Worst Times to Fertilize Your Lawn
Yes, there are wrong times to fertilize. Experts agree these three scenarios are when you should absolutely hold off.
1. During Extreme Heat
It might seem like your lawn needs extra help when temperatures soar, but fertilizing during intense heat can actually stress your grass.
“When I fertilize grass, I’m trying to help it not stress it out more,” says Stephan Hall, eastern regional vice president of Moon Valley Nurseries. When it’s hot during the day and at night, grass struggles to absorb nutrients properly.
Reiter adds that fertilizer salts can draw moisture away from grass blades during heat waves, increasing the risk of fertilizer burn.
Bottom line: Skip fertilizing during prolonged heat or drought conditions.
2. Before or During Heavy Rain
Rain can help water fertilizer into the soil but too much rain washes nutrients away before they can do any good.
“Avoid fertilizing during long periods of rain, meaning four to five days straight,” says Lou Manfredini, home and garden expert for ACE Hardware. Heavy rain can dilute fertilizer and render it ineffective.
Light rain or a gentle soak is fine, but torrential downpours are not.
Bottom line: Wait until heavy rain passes before fertilizing.
3. When It’s Very Cold
Fertilizing when grass is dormant is another common mistake.
“When the grass is in a dormant state, you don’t want to apply fertilizer,” Hall explains. Doing so can signal the lawn to grow when conditions aren’t right, increasing stress and making grass more vulnerable to frost damage.
Bottom line: Don’t fertilize frozen or dormant lawns.
The Worst Time of Day to Fertilize
Even on the right day, timing still matters. Experts recommend avoiding fertilizing during the hottest part of the day or in direct sunlight, especially with liquid fertilizers.
“If fertilizer evaporates on the blades instead of soaking into the soil, it won’t work effectively,” Hall says.
Best time of day: Early morning or early evening, when temperatures are cooler and moisture levels are higher.
The Best Seasons to Fertilize Your Lawn
If you want to get the most from your fertilizer, focus on spring and fall.
- Spring: Mild temperatures, active growth, and natural moisture create ideal conditions for nutrient absorption.
- Fall: Fertilizing helps strengthen roots and prepare your lawn for winter dormancy.
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