Is this bentgrass? If not, what is it?
I have this lighter colored grass that there are patches of in with my darker colored newer lawn. It is unaffected by a broadleaf weed killer,which leads me to believe it may be bentgrass. Can someone confirm this? If not, can you tell me what it is? My lawn is in Western Washington and the grass is in it's third season. The lighter colored grass has a wide, flat leaf compared to the rest of the lawn and there are several "clumps" of it around the lawn.
Also, I just put a new blade on my Toro push mower. I mulched for the first time, and after I cut the grass there are circles that are about the size of the blade all over the lawn. Does this have something to do with the new blade? Being unbalanced perhaps? Or is it because I mulched? I didn't have this issue with the old blade.
Here is a link that might be useful: Photos of undesirable grass and circles