There are 550 sedge species native to North America, and only two of them are considered a problem: nutsedge and wood rush flat sedge. There are about 1500 sedges that are not native to North America and some of them are very aggressive and could be considered invasive in your area. For the last four years, I have been planting and observing six different such species in my garden. The native ones are very well-behaved and easy to maintain. The two non-natives are completely aggressive and takin