I was going to let my grass grow long this year to see if it would help with the hot dry months of late June, July and early August. Raised the mower deck to 3-1/2". Looks now like a lot of the grass is growing seed heads. Is this a bad thing or can I just let it go and keep it longer ??? I planted this grass and it's called "Rhino 3-3-3" (local company) . Supposed to be 30% Blue grass, 30% Annual Rye and 30% something else. Can't remember now what it was. Thanks in advance for any help !!