Good question, what can give you a nice green pop in the spring, without too much flash in the pan spring overgrowth?
I question the merits of a 'winterizer' adding much of anything to early spring green up the following season. To me, I would rather do my final round fert early enough that the grass can fully utilize the nutrients and feed its roots in the fall, rather than wait until near freeze up and hope the fert carries over to next spring. Just too much going on with brutal winter conditions and spring melt off to have it make sense that a winterizer app will carry over to spring, even a small % of it.
7x14 Stealth SE Enclosed with 48" side ramp
08 Toro Z400 - 48" deck, 21HP Kaw
09 Exmark Turf Tracer HP 36"
21" Toro SR4 Super Recycler
Stihl KM90 Kombi w/ straight shaft trimmer & tiller heads
Husqvarna 125B Blower
Turfco XT5 Aerator
Turfco LS-22 Overseeder
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