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Perennial ryegrass is a short-lived perennial that comes in
turf-, pasture- and hay-adapted varieties. The pasture-adapted
varieties tend to have finer leaves and smaller and more numerous
tillers, and are later maturity than the hay varieties. Perennial
ryegrass is early and vigorous in the spring, and grows well
into the fall, but is unproductive during the hot, dry summer
months. Winterkill is promoted by excessive top growth going
into the winter. Perennial ryegrass may winterkill in alfalfa
mixtures that are left to overwinter with considerable fall
growth. Perennial ryegrass is not well adapted to areas with
prolonged ice cover and extreme cold without adequate snow
cover.
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