Today is May Day. Is it too late to over seed my yard?

Today’s lawn problem needs attention today. Waiting for August merely is not acceptable. Killing dandelions and henbit today will leave bare areas for crabgrass to move in this summer and when the crabgrass dies this winter, the dandelions and henbit move back in for the spring. It’s a vicious cycle, and the only thing that will stop the cycle is to keep grass growing in those bare spots. No bare spots no weeds. 

Longer daylight hours, and gradually warming soil temperatures have started to green up area lawns and golf courses. Hazy brown turf is turning bright green as new grass shoots pop out of the ground in response to the first spring fertilizer treatment.

Thin areas and bare spots show up quickly as the rest of the lawn begins to turn green. Winter injury to newly seeded areas is apparent. Dead crabgrass and foxtail form brown patches and bare spots in the otherwise green turf. Heavily shaded areas look particularly forlorn and muddy.

Question of the week. Can I seed my lawn today? The answer is almost always, YES! Grass Pad customers have been successful in seeding twelve months of the year. Every year and every season brings a new challenge when it comes to overseeding, and if you have reasonable expectations when you seed your lawn in May, you can be successful.

Reasonable expectations. If the coming summer is as wet as the last three, then there is an excellent chance the majority of your spring seeding will survive the summer with routine watering. If the weather pattern changes and we get high heat, blowing wind and no rainfall for extended periods, even the most drought tolerant grass seed will have a tough time surviving without a mature root system.

The good news is that Mother Nature wants to give you some help in greening up your lawn and filling in those unsightly bare spots. Grass plants have a biological clock and will begin to sprout and fill as the weather warms. The bad news is that ordinary lawn weeds will also start as fast

Weed control problems can create an interruption in spring seeding. But patience and timing will help guaranteed success. If broadleaf weeds are a severe problem, treat before starting to seed. Liquid weed control products containing Trimec or Speedzone do an excellent job for spot treatment or granular Loveland Weed and Feed for large areas.

Wait five days after broadleaf weed treatments and then begin your seeding program. Although some seed may be lost by seeding so quickly, the higher risk is summer’s approaching hot weather.

Eliminate crabgrass when overseeding in early May by applying Tupersan, a seed safe pre-emergent, and Golf Course Starter the same day. Once the seed has germinated and has grown tall enough to have been mowed twice, apply Prevent for season-long crabgrass control.

How long do I wait to seed after applying Prevent? Overseeding is not an option after you have applied Prevent. However, you can be successful seeding small bare spot areas using Uncle's Seed Sandwich technique, using a layer of PrimeraFC as an insulator above the Prevent barrier.

Excessive Spring Rains Bring Crabgrass and Nutgrass

Every year a lawn maintenance program needs a little adjustment. Some years are too dry; some years are too wet. This year has been just plain soggy. Spring grass plants are lush and green, and lawn mowers are working overtime. Ducks and crawdads like this sort of weather, but once summer weather heats up there will be a price to pay. Excessive spring rains will bring two very predictable summer problems: crabgrass and nutgrass.

Crabgrass Booster Shot
Annual summertime grass weeds like crabgrass, goosegrass and foxtail will sprout aggressively in water logged soils. The same May rains that made lawns so nice and green in the spring will break down the effectiveness of early spring crabgrass preventers. Areas around driveways, sidewalks and patios are particularly prone to this problem. Concrete surfaces absorb and intensifies summer heat and make a natural incubator for hot weather weeds along its edges.

Related: Uncle's Idiot Proof Lawn Care Program

Heavy rain dilutes the crabgrass pre-emergence barrier applied in early spring. Then, the first week of hot June weather prompts weeds like crabgrass and foxtail to sprout and begin their annual invasion of green summer lawns. Step #3 PREVENT!, crabgrass preventer, applied in late May to early June provides a booster shot to extend weed control and prevent crabgrass all summer long.

Gardens and flower beds have the same problem. Well tended beds fall victim to an invasion of aggressive summertime weeds. Garden weed preventers applied in early spring are simply overwhelmed by extreme spring rains. For best results, three booster applications spaced six to eight weeks apart will keep gardens and landscape beds clean all summer long.

Related: Uncle's Q-Bomb Post Emergent Crabgrass Control

Nutgrass Control
Nutgrass is a common problem in summer lawns, even after an average spring. Nutgrass is not controlled by crabgrass pre-emergence. Nutgrass plants can regenerate from small nutlets formed on their root system under the soil surface. These nutlets go unharmed by pre-emergent and traditional contact weed controls, making nutsedge difficult to control.

Nutgrass or nutsedge has triangular stems with leaves that branch out in three different directions. Light green to yellow in color, nutsedge grows quickly in spring and summer, outgrowing grass in just a couple of days after mowing.

Uncle's Nut Buster, when used with Spreader Sticker, is the most effective control for nutgrass in the home lawn. Spreader Sticker, a non-ionic surfactant, holds the herbicide to the waxy leaf of the nutgrass. Be patient and allow the herbicide to stay on the nutgrass leaf 48 hours before mowing or watering. Give the plant plenty of time to draw Uncle's Nut Buster deep into the root system and translocate into the nutlet for best control.


Timing is everything, and early control is best. Nutgrass plants allowed to mature will stress when treated, stimulating more nutlets to sprout. However; be persistent and continue to spray the new plants as they emerge, and you will be victorious. Avoid pulling the nutgrass plant by hand. Pulling nutgrass will stress the plant and stimulate even more nutlets to sprout.

See Also: Fungus Fighter Turf Disease Control