Late last fall when I was in New Orleans I collected some seeds of cypress vine or cardinal creeper (Ipomoea quamoclit) by the wayside. I planted some of the seed in May, along with seeds of the moonflower (Ipomoea alba), after having soaked both in water for a day. They must need considerably more warmth to germinate than regular morning glories (Ipomoea purpurea), which usually pop up almost immediately, because no seedlings appeared until almost the end of June. Conditions probably have also been less than ideal for them since then, confined as they are to pots on the balcony with only a few hours of direct sunlight. Yet lo and behold, today the first flower appeared on one of the delicate cardinal creepers.
Cypress vine or cardinal creeper (Ipomoea quamoclit)
Ipomoea alba is setting some buds as well, though they are still very small and developing quite slowly. Perhaps next year I will have to try to find a place for these in the open ground.