and other annual weeds, or damaged by insects such as white grubs or chinch bugs? If the answer is yes, then repetitive overseeding can help. Repetitive overseeding is an easy method to make existing lawns more dense by simply sowing more seed .
It is recommended to fill in a lawn with 50% or more grass coverage. However, at 50% you will likely need overseeding twice to get the lawn to 90-100%. Just throwing seed on your lawn without aerating or working up the soil will have little to no positive effect on your lawn.
If you reseed every three to four years you re-establish the lawn before it begins to thin out. This ensures the lawn stays thick and dense, which prevents weeds from invading. If you have pets or areas that receive a lot of foot traffic, you may have to reseed more often to prevent bare patches.
Depending on conditions and type of seed, new grass seed will begin to emerge in 5-7 days after seeding when moisture and soil temperatures are adequate. An overseeded lawn can be fully established in eight weeks or less. Proper watering is critical to successful overseeding.
Don't overdo or cut corners. Too much grass seed causes undue competition for resources such as light, water and nutrients, and grass seedlings struggle as a result. Too little seed leaves lawns thin or bare.
DON’T make these 7 STUPID Mistakes when OVERSEEDING your LAWN
Can I just throw grass seed down on existing lawn?
Overseeding can help you get back to the thick, lush, green lawn you've always wanted. By spreading grass seed over your existing lawn, you can thicken up the thin areas, and your lawn will start to look terrific again. (This is different from reseeding, which is when you start over and plant a completely new lawn.)
It's critical that you properly water your lawn after aeration and overseeding. Not doing so could have negative results such as a lawn that won't grow, wasted money, or needing to re-seed all over again. It's important to keep in mind that lawn care is a partnership between you and your lawn care company.
Many think that putting topsoil over the seeds would protect it, but in fact, that will actually suffocate the seedlings rather than doing any good. We suggest that straw, hay, or any other type of mulching material be used.
The main reason grass seed doesn't germinate quickly during the spring months is cool and wet weather. Grass seed that is planted in soil temperatures below 50°F often will not grow. For the soil temperatures to reach 50°F you need 7-10 days of air temperatures to reach over 60°F.
Hands down, early fall is the best time to overseed your lawn. The absolute sweet spot for most northern regions of the U.S. is August 15 to September 15. That's when daytime temperatures are still warm enough to encourage growth and nights get cooler, giving new seedlings a break from the heat.
Watering is one of the most important aspects of successful overseeding. You need to water the seeds into your lawn immediately after spreading, and continue to water daily until the seeds germinate, which can take up to two weeks.
By spreading too much grass seed, however, you encourage root competition between each seedling as they attempt to grow. This can lead to some seeds pushing through the soil quickly, absorbing their portion of moisture and nutrients whilst others fail altogether.
At the appropriate time to overseed (knowing when to reseed a lawn is based on your climate and grass type), start by loading the grass seed into a seed spreader and spread about 16 seeds per square inch of soil. The right seed density will depend on the thickness of the existing lawn, so some lawns might need less.
When it's October, people often wonder if it is too late to plant new seed. The good news is if you hurry, seed can still be planted in October with the hope that it will survive the upcoming winter. Although September is the best time, often we can still plant grass seed up to October 15 with good results.
Mow the lawn prior to overseeding. Water the lawn to moisten the soil, but make sure it's not soaking wet. A good rule of thumb is to water the day before you plan to overseed so the soil has a little time to dry.
After you lay down your seedlings, they'll need time and the right environmental protection to grow. They'll need to acclimate and set roots before the first mow, so during the first two to four weeks post aerating and overseeding, don't mow.
Remember: Do not over-water! Some soil types will get spongy, and walking on it in this condition will leave serious depressions and cause compaction. Trying to correct a yard full of deep footprints is not a chore you want to attempt! The top inch of soil should stay moist at all times.
You can overseed at almost any time of the year for a fraction of the cost of a complete reseeding. There is no risk of erosion from sudden downpours, and it's faster, neater, and less expensive than starting from scratch. The process of overseeding is not complicated.
Overseeding is a natural and cost-effective way of reducing the need for pesticides, water, and fertilizer. Overseeding enhances the color and consistency of your lawn's appearance. It can also prevent weeds from growing by helping to thicken your lawn's canopy and preventing light from hitting the soil.