Answer: How frustrating! It sounds like a self sown morning glory popped up. The plants are related to each other so they do look similar. Moonflowers can be a bit harder to start than morning glories, as you have learned. When I start mine at home, I nick the seed with a razor blade and soak it in tepid water overnight (or longer) until the seed is visibly swelling. Then I plant it. They require warm soil, so don't plant them outside too early. Finally, they really like as much heat and sun as you can provide in order to grow and bloom well. Good luck with your moon flowers!
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