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If you have orange daylilies growing in your yard if they're the invasive kind how do you know if they're the invasive kind These are orange ditch lilies, Hemerocallis fulva. And there's a reason you see them growing in huge patches like this or along roadsides in ditches. The tiniest little root fragment will sprout and spread underground runners and create these dense colonies out in the wild. This is the side of the road in Southern Wisconsin in early July. This is why they're called ditch lilies. But not all daylilies are invasive. These are classic Stella d'Oro daylilies. They're not native, but they're not aggressive and invasive. This is another variety. These are fine. These have been hybridized varieties, so they don't spread as aggressively as those original orange daylilies. So how do you know whether the type that you have is invasive? Look at the flower closely. The orange ditch lily has a more narrow petal. It's orange with a darker orange or almost a red part in the center. So flower shape is your first clue, but most importantly, you actually need to look at how they grow. The invasive varieties spread incredibly fast. They start popping up all over the yard. If you planted one or two and now you've got a huge patch, you have the invasive variety. Those more modern varieties don't spread this aggressively. Now just a few blocks from here is a fully native wet bottom retention pond that was grown from seed ten years ago, and look what's now showing up. Invasive ditch lilies are growing. There's about five different patches that I have found in here. These were not planted. When people in my neighborhood are out digging and trying to corral the ditch lilies in their yard, little root fragments are getting into the groundwater, which make it into this temporary basin during storms, and the root fragments take hold, and now they are spreading. And this should be filled with nothing but native plants. If this plant is allowed to continue in this pond, it will choke out the native vegetation here. It is possible to dig these out. It'll take a couple years to stay on top of any sprouts that come up each year, but it is possible. I have several clients who have done it. If you're comfortable with herbicide, you would want to apply it in late summer, early fall.