Spring fertilization is a common practice in zones 6 & 7, but is not the best time to apply nitrogen fertilizers. Spring nitrogen fertilization can increase mowing requirements of home lawns to every 2 or 3 days. Turfgrass diseases such as brown patch may be increased. Also, spring fertilization may increase grassy weeds such as bermudagrass, crabgrass, and dallisgrass by providing increased fertility during the peak of their growth cycles. Excessive fertilization during the spring can also promote more vertical growth of the turfgrass at the expense of the root system, resulting in weaker turf during drought conditions. Fall is the best time to fertilize turf and promote a healthy root system.
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