Over the years I have defined a difference between a “Fall” lawn fertilizer and a “Winterizer” fertilizer. These two types of fertilizer really address the root growth and winter hardiness of Kentucky Bluegrass.
Physiologically, grass produces an excessive amount of new roots in the spring and also in the fall when the temperatures are cool, soil moisture is high and primary nutrients for root development are readily available.
Roots of Kentucky bluegrass develop from the underground nodes of the rhizomes and from the basal nodes of the above ground shoots called the crown. Roots also develop at the terminal nodes of rhizomes that emerge above the soil as shoots.
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