The lawn was getting long so I decided to mow it today. My 7 year old was very disappointed. He asked me, "Why did you have to mow the lawn today?"
"Because it was getting long," I said.
"But you cut down all of the wheat grass that I was collecting," he said. (The wheat grass that he collects are the grass seeds that grow on the tips of the long pieces of grass.)
"That's exactly why it needed to be cut. If it's long enough to have seeds, then it's past time to cut it!"