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I am assuming that Missouri Primrose is Oenothera missouriensis here. If my assumption is right then I'm not quite sure that it is the same plant as you have there. The plant I'm talking about has slim leaves with pale veins. It's hard to tell from a pic if that is the case but I hope the hint will help you to see if it really is the Missouri Primrose.
Mine is more of a "flopper", can be staked up, but I just let it flow over itself and makes a nice mound, with a long bloom period here in WI ( where it is just breaking dormancy)
Baa's books now tell me that it's now called Oenothera macrocarpa! Anyway, it also states it's a trailer and has a spread of 20 inches and will grow to 6 inches tall or there abouts.
