A controlled burn of some seven acres of vegetation at Jefferson Memorial Forest Tuesday went smoothly.The fire began at 10:45 am and lasted less than three hours. The burns have been used for several years and are meant to let native plants flourish while destroying invasive species.Metro Parks spokesperson Margaret Brosko (BRAH-skoe) says another is planned for Iroquois Park."It is on the list, but it just depends if the weather cooperates, because we're in that situation right now where it's kind of touchy because things are greening up a little bit. So we just want to make sure we don't get too far into the season."Brosko says if the Iroquois Park burn isn't done this week, it won't happen this season.