I'm just about done with my second mowing of the 20. Dayum, some areas had the foxtails and June grass (cheat) WAY over a foot high, along with the mustartd that was in the two foot range.
Some of those areas I had to go Slow-slow to keep from bogging down the blades..
Only thing left are about six acres of light growth, in the less than fertile areas.
Now my back lawn has in interesting effect going on. When the grandson was growing up I used to let him use the garden hose to eliminate dog turds.
I was sitting outside, this morning, admiring my back lawn, and all the spots of real green with the grass higher than the rest of the lawn. Only one answer, dog turd fertilizer.