I have a clump of yellow iris in my garden in my front yard in St. Paul (approximately 5 feet x 5 feet). I moved into the home 3 years ago and just found out yellow iris are invasive in Minnesota. I was reading about these on the MN DNR website and it says it competes with native shoreline vegetation. Since I am not on or near a lake, is it ok to leave these as is (I do like the look of them in my garden). Thank you.