I don't think it is Giant Hogweed. I've never heard a single report of Giant Hogweed being found anywhere in Oklahoma. I checked the USDA's NCRS plant website and the distribution map (linked below) doesn't show Giant Hogweed anywhere close to OK. I looked at your photos last night and my initial reaction was it has a slightly familiar look, but I'm not sure I've seen it here. I think it likely is related to something we have here though because it looks just familiar enough that I feel like I ought to know what it is, but I don't. When I have a weed I want to ID, I let one bloom so I can be sure of what it is before I decide whether to keep it or remove it. Some of my favorite wildflowers are considered weeds by most people. When one of those pops up in my garden, I let it stay. I have Indian Paintbrush blooming in the new back garden close to some perennials I planted. I'm happy to have it there. I think it could be from the carrot family, but the only one I have on our property is Queen Ann's Lace and it is too invasive for me to let it stay. If you let one of them go to seed this year, you'll have a million of them next year. I don't need a million wild carrot plants to pull. This year I've managed to find and remove every single one before it has bloomed. However, there are lots of native mallows that have foliage similar to your plant, including the one Robert linked. I like the native poppy mallows and let them stay when I find them in the yard or pastures. As long as you disturb the soil, you'll get a plethora of weeds, and you'll still be seeing about as many a decade or two from now as you are seeing this year. Many weed seeds can survive in soil for many decades. As soon as I disturb soil by rototilling, digging, etc., I quickly cover it with cardboard, landscape fabric or mulch, or some combination thereof, so I don't get a million different weeds sprouting. If you let them sprout and grow, then you have to spend oodles of time figuring out what they are and whether to keep them or remove them. I'd rather not have to deal with them at all. If I wasn't trying to improve our clay soil down deep, I'd never disturb the soil at all. I'd just switch to no-till gardening and disturb the soil as little as possible. I hope one of these days we'll have improved the soil enough that I can switch to no-till. I think we may be getting close. We dug postholes this past week to set new posts to replace the entry arbor with a new one and we had to go down about 18" to get deep enough to find the red clay we had when we started the garden spot. I found that encouraging. Whatever it is, always wear gloves when handling new weeds because it is surprising to me how many of them can cause itches, rashes and other skin irritations if you're allergic to them. They don't have to be poisonous to cause you problems. And, by the way, when I have weeds in a place where I don't want them, I don't worry about IDing them. I dig them, hoe them or yank them out---whatever it takes to remove them and then I cover that soil surface so something new doesn't sprout. I don't really care what they are---I don't have to know what they are in order to remove them. I spent several years walking around our property IDing various native trees, shrubs, grasses, vines, perennial and annual weeds because I wanted to be sure we were not removing something we'd wish we'd kept. Despite that, we still have dozens of kinds of plants on our property that I cannot identify. There's just too many wild plants and not enough time in the world to figure out what each of them is. When someone points at one of them and says "What's that?", I just shrug and say something like "Well, it is in the aster family and I don't know what it is, but the bees like it, so we left it here for them." Dawn Here is a link that might be useful: Giant Hogweed Distribution Map

Hi Gina, no apologies needed:-) people her will chime in on the IDs, it's not a pain at all, and the list is a little less active because it's JUNE, yay, we are all out in the dirt:-) if you don't get a response soon, try this: repost your photos with numbers and just a short request for ID's. That makes it easier for folks to answer. usually you'll get several responses, with each person just IDing a couple plants, rather than one person doing it all. The numbers help make it easier for several folks to each focus on what they know best.

Yes, Baptisia. Also known as false indigo. Now that you know what it is, you'll start noticing it more often. That's how it is for me anyway when i learn what something is. It is native and its tap root goes down as much as 10 ft so it is very drought tolerant in Oklahoma but that also means it's not one you can transplant by digging up. When it forms seeds it makes these really cool pods that are hard, brown and rattle when you shake them. The seeds inside are sticky too! If you're interested, you can start them from seeds but it takes years for the plant to establish so it won't bloom for about 3 years. I love native plants so thank you for letting me nerd out too. :) I am jealous of your hummingbirds. I've seen them flit through my yard but they don't stay or visit my feeder. However, they often frequent my MIL feeder less than 1/4 mile away.

Agree with both, with the first likely to be Liatris aspera. As for the second.......one of the zillions of the late season, yellow flowered Asteraceae :-)