Overseeding starter fertilizer is applied right before seeding. Walter Reeves, The Georgia Gardener: Fescue – Planting Seed – New Lawn, Suffolk County Department of Economic Development and Planning: Overseeding Your Lawn, Yardcare.com: Cool-Season Grasses | Choosing the Right Grass, Pennington: How to Overseed or Reseed Your Lawn, Nature's Seed: How to Fertilize Your New Fescue Grass Seed Lawn. Memorial Day (the end of May): The application rate at this time is 32 pounds per 2,500 square feet. Addressing soils that aren’t amended with organic materials Landschoot continues, “In cases where soils are not amended with compost, nitrogen is almost always needed for rapid establishment. Put on safety gear, including shoes, gloves, safety goggles and a dust mask before applying the fertilizer. Use your seed spreader to apply the fertilizer in two directions. Water the lawn lightly, twice daily at first, while the grass seeds germinate. Although you can use a starter fertilizer for a lawn that is established, it’s better to use a well-balanced fertilizer designed specifically for grass that is established. If you don’t overseed, there’s no need to top-dress in fall. When to Apply Use when planting seed, sod, sprigs or new lawn plugs or when overseeding. Fertilizing in late October builds energy in the grass root systems, forcing grass plants to push new roots and rhizomes. You overseed with fescue when the fescue areas become thin. When overseeding lawns, you may find it necessary to apply a starter fertilizer before or directly after seeding. If your lawn consists of Kentucky bluegrass, fine fescue, or perennial ryegrass, choose a product specially designed for overseeding thin lawns, like Scotts® Turf Builder® Thick’R Lawn™ Sun & Shade, which combines grass seed, fertilizer, and a soil improver into an easy-to-use product you apply … Always check the rates on the bag as they vary among brands. If you are over seeding, I would not put any fertilizer on the lawn-The new grass will have zero chance with the established then. If there's a heavy layer of thatch or the soil is compacted, aerate the soil. When phosphorous and potassium are applied only to the surface of the soil they cannot move down into the soil fast enough. I was thinking of getting bulk bags fromTSC, but they don’t label things the way Scott’s would. Apply a Starter Fertilizer When the soil temperature falls to 50 to 65 degrees or the air temperature is between 60 and 75 degrees Fahrenheit, apply a starter fertilizer for overseeding. Water it before planting the fescue seed. Penn State Extension notes that analyses of 15-10-10 or 10-6-4 are also acceptable used as starter fertilizers for grass, as they also promote good early growth and grass development. For winter color, overseed southern lawns in fall. This is especially true if a soil test says your soil Phosphorus (P) is low. Apply at a rate of 1/2 to 1 pound of nitrogen per 1,000 square feet of lawn. Of course, donít go overboard with its use and think more is better. In fact, you should wait six to eight weeks before applying another dose of balanced fertilizer to your grass after planting so it doesnít incur burning. The test will note just what nutrients require beefing up in the soil to benefit your turfís growth and how much is required. Also, build in a few days to interpret the report and purchase the correct amount and type of fertilizer.”, If you didnít get a soil test to determine how much starter fertilizer for the lawn you should use, Landschoot writes, “Starter fertilizers should be applied at 0.5 to 1 lb. Overseeding after aerating is a no-brainer, and it is the best possible time to do so, according to our Gaithersburg lawn care partners.-Apply soil amendments: Lime, Fertilizer… nitrogen per 1,000 sq. Two specific moments are better to apply starter fertilizer. 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