In addition to underground boilers and miles of piping, along with grow lamps used above, Lambeau Field has synthetic fibers woven into the grass.
Lambeau Field is also rarely used for events other than football.
Multi-use is a factor, as well as recovery time for grass. MetLife stadium, where the World Cup final is hosted, switches the end zone names and coloring for the Giants and the Jets, and they can play in the same stadium Thursday and Sunday, not leaving much time for the field to recover. The Packers can go two weeks to recover, three if there's a bye week in between.
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Source: Freerepublic.com
