How do those of you with a small prairie planting mow it the first few years? My instructions tell me to keep it to 6" this year and 8-10" next year, but how? This is a small area, about 25x100 ft. so no big equipment. We've mowed it once with the lawn mower on its highest, but that's about 3.5 inches. It seems too big to try to cut it with a regular string trimmer and I've been looking at wheeled string trimmers, but find that they won't mow any higher than 5". Any suggestions on my best option?