Deep watering produces deep roots--everybody knows that--or do they? Hmmm... Or is this an old wives tale? So why do sprinkler companies set their clocks usually for everyday? So does deeper watering yield deeper roots--how deep? If one inch of water gets 4 inch roots. Does 2 inches of water yield 8 inch roots? 6 inches of water 24 inch roots? Does it depend on grass species? Soil type? Soil temp? Soil aeration?