re: Buying a zero-turn lawnmower

quote:

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mid grade trim level is probably preferential for residential lawns

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Is this statement referencing the height you should cut the grass? Depends on the grass. Some grasses can be cut shorter, Bahia, Bermuda ( 2 in. or shorter). Some grasses don't like to be cut short (St. Augustine), and doing so will cause bare spots to develop.
Adjust deck height to where you're cutting no more than half the length of the blade of grass.