Last year, I had a moon vine and a pink morning glory sharing a trellis. At the end of the season, I found seven seeds on the ground, which I collected, kept indoors over the winter and put in pots last May, not knowing which they were. Now I know: they are moon vine! At least the 3 I kept. This is a fabulous flower, 5 inches (12 cm.) across and splendid even in front of a white fence.