Irrigation season opens in Denville in May, on a morning when the ground has finally warmed and the maples are done dropping their seeds everywhere. Thom Mist Lawn Sprinklers Inc brings systems back to life then, walking zone by zone, watching each head throw and adjusting until the spray lands on grass instead of pavement. A lawn watered evenly in the cool hour before sunrise stays green deep into July without anyone standing out there holding a hose. Through summer it is repairs and fine tuning: a cracked line, a head clipped by a mower, a zone that simply quit. Then in October the systems are blown out and put to bed before the first hard freeze arrives.