Crown Hydration continues to be one of the most destructive yet least preventable forms of winter kill that causes damage to a lawn. Crown hydration commonly occurs during the late winter months when warmer daytime temperatures cause the snow to melt followed by rapid freezing temperatures. The worst affected areas are in the low lying, poorly drained soils that are prone to standing water. Under these conditions the turfgrass crown begins to absorb water and become saturated. Extreme temperature fluctuations cause thawing and rapid refreezing creating ice crystals in the turfgrass plant cells that ultimately rupture and cause plant death.