Such a garden brings the wild close to home and shows appreciation for Missouri's natural heritage. That's because it's often difficult to extricate the complete root system of a perennial in the wild, especially in rocky soil, but nursery plants, grown in pots, have intact root systems and a better chance of surviving. With seed, be patient. It may take a couple of years for some species to germinate. Once you have flowers, you can collect seed and expand your plantings.
Seeds also make much-appreciated gifts.
By refraining from digging up flowers in the wild, you help preserve the natural landscape and the place each plant holds in an ecosystem. And there could be penalties for removing some plants. Herbicides-Avoid or minimize the use of herbicides near such plants. If you must use a herbicide, choose one specific as possible for the problem plant you wish to eliminate. They can take over a native plant's habitat.