My lawn has predominantly fine fescues, but before I knew the different kinds of turf grasses, I bought several big bags of Scotts northern seed mix, which turned out to be perennial ryegrass. Several online sources suggest mowing perennial ryegrass at 1.5 -- 2.5 inches and twice a week. I've only been able to mow once every five days and I'm mowing them at 3 -- 3.5 inches. What happens when we let the grass grow more than the suggested heights?
Not sure if and how these are related, but three observations: 1) the patches of perennial rye grow very fast between mowings. I often ended up cutting the top blades more than the recommended 1/3; 2) The grasses are very stemmy; 3) Either it's the hot spell in northeast US in late May or that too much blades have been repeatedly cut, some of the perennial rye patches are showing brown blades (and stems). Did I keep the grass too high or did I not mow often enough? What should I do going forward?
UPDATE Seed mix composition