The best September lawn care products for cool-season grass include nitrogen fertilizer, grass seed for thin spots, and lime if your soil pH runs low. This month gives your lawn the ideal window to build strength before winter arrives.
I turned my worst-looking lawn into the best on the block with a September routine two years ago. The grass had thinned badly over a hot summer. Weeds had taken over large patches. I started with a soil test, applied the right fertilizer, and overseeded the bare areas. By the following spring, neighbors asked what my secret was.
September works so well for fall lawn treatment because of what happens underground. Soil temps stay warm enough for root growth while air temps cool down. Weed seeds go dormant so new grass faces less fight. Your lawn can focus on building a strong root system instead of fighting for space.
Go with a nitrogen-rich product when doing a September fertilizer application on your grass. Look for items with a higher first number on the bag like 24-0-10 or 22-0-8. The nitrogen pushes new blade growth. The potassium in the third number helps grass get ready for cold weather ahead.
Grass seed goes down well in September too. The warm soil speeds up germination. Cool air means less water stress on young plants. I spread seed at about 3 to 4 pounds per 1,000 square feet (1.4 to 1.8 kilograms per 93 square meters) for overseeding thin areas. New grass should sprout within 7 to 14 days under the right conditions.
Lime helps if your soil pH tests below 6.0 on the scale. Most cool-season grasses prefer a pH between 6.2 and 7.0 for best nutrient uptake. I test my soil every two years and add lime based on the results. Fall gives the lime time to work into the soil before the next growing season starts.
A friend skipped her September lawn products for fall two years in a row. Her grass went into winter thin and weak. Come spring, weeds had taken over and she had to spend three times as much to fix the damage. A little effort now saves a lot of headaches later.
Adjust your mowing height as part of your fall routine. Keep the grass at about 3 to 3.5 inches (7.6 to 8.9 centimeters) through September. This height shades the soil and helps new seed stay moist. Lower the blade for your final fall mowing to about 2 to 2.5 inches (5 to 6.4 centimeters) to prevent snow mold.
Water needs change in September too. Cool weather cuts down on water loss from the soil. Cut back to about 1 inch (2.5 centimeters) per week unless you seeded new areas. New seed needs light daily watering until it sprouts. Then cut back to let roots grow deeper.
Put these September tasks in order for best results. Test your soil first. Apply lime if needed and wait a week. Spread fertilizer next. Overseed thin areas last so seed lands on top of the fertilizer. Water everything in and watch your lawn transform before winter hits.
Read the full article: When to Fertilize Lawn by Grass Type and Season
