One of the lawns I mow seems to grow much, much faster than any other lawn I mow. Yesterday I showed up and, sure enough, it had grown quite a bit over the last week (I should also mention we've had rain almost every day during that time). Anyways, even on my highest setting, one mow wasn't enough. There were clumps and blades of grass sticking up in various places. So, I knocked it down a setting and mowed over it, then took the blower to the excess clumps. It turned out nice, but my question is, do you charge extra in a situation like this? If so, do you tell your customer ahead of time or just put it on the invoice as "double mow due to excess growth" or something along those lines? Thanks.