By, the Old Guy with the Ponytail
In the fall, more than any other time of year, your lawn manufactures carbohydrates. It manufactures these carbohydrates in the green leaves. It uses these carbohydrates for energy to recover from summer stress and develop thru the fall.
Surplus carbohydrates are stored in the roots and utilized the following spring to support top growth. Fertilizer applied in the fall supports and stimulates carbohydrate production. Two thirds of the yearly nitrogen fertilizer applied to your lawn should be applied in the fall.
One third should be applied in the early fall around Labor Day. Fertilizer at this time helps the lawn to reestablish a deep root system compromised by summer stress. It also promotes lateral top growth which creates a thick, green, aesthetically pleasing lawn. A thick lawn is the most effective preventative for both broadleaf and grassy weeds.
Existing broadleaf weed populations are effectively controlled with weed control products at this time of year. Removal of broadleaf weeds allow the lawn to fill in these areas.
One third of the yearly nitrogen fertilizer on your lawn should be applied in the late fall, at the end of the growing season after the turf has gone dormant but before the ground freezes, typically between the end of October and Mid November. Fertilizer applied at this time of year is almost entirely utilized for root development and the production and storing of carbohydrates for use the following spring.
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