Instead of applying costly pesticides, sow quality grass seed. Reseeding your lawn every year will help maintain good turf density and make it very difficult for weeds to take hold and grow. In fact, some grasses actually release a beneficial toxin into the soil that acts like a natural preemergent herbicide, preventing weeds from germinating.
Reseeding with genetically improved varieties will also boost your lawn’s performance. Many newer grasses require less fertilizer, watering and mowing compared with the older grasses that are most likely in your lawn. If you haven’t reseeded in the past 10 years, you’re long overdue. Simply use your fertilizer spreader to broadcast seed immediately after core aerating. Those soil plugs lying on your lawn’s surface will dry out while you do this. After you’ve spread the seed, break up these cores with a rake. The combination of seed and pulverized soil will backfill your aerator holes, creating perfect seed-to-soil contact.