I have had these everywhere I have lived in Texas--in Corpus Christi, and in the Rio Grande Valley. They are beautiful, grow to about 10-12' high and always full of bloom in spring, and they repeat bloom all year. They can freeze back, but have never known one to die from cold weather. They will come back from the roots. Have never seen any color except mauve/lavender with a deep purple throat. Everyone I know calls them 'Mexican morning glory' and I always wondered what the botanical name was. When I was a child we played with the seeds and called them 'monkeys.' Nobody ever warned us that they were toxic, but I for one would never put a fuzzy thing like that in my mouth!
Last year I saw one of mine doing something I have never seen before: during a hot dry spell, they started putting out tendrils from the pointed ends of the heart-shaped leaves! and reaching out to a porch support post they were growing close to. Some of the tendrils got to be 1-2' long. Has anyone else seen that?
Chamma, your picture looks exactly like the ones I am familiar with.