Wow, I had never heard of a morning glory that grows from a tuber or a caudex. I'd love to see pics of those if ya'll end up growing them. I planted some dahlia seeds this spring that I had gotten in trade & they formed pretty big tubers. I had always thought that the dahlias you grow from seed were annuals, but I guess since it grew a tuber it'll probably come back next year since dahlias can be over-wintered in the ground here.
Speaking of dahlias, this was the first year I had grown them, and I found they don't seem to like the summer heat here. Are you supposed to grow them with morning sun/afternoon shade? I had thought they were full sun plants. Maybe it was a watering issue, too much or too little. Mine grew well in the spring, but as soon as it got real hot the lower leaves would dry up and fall off. They got real scraggly looking and I had to cut them back. Anybody know how to remedy this? If they're going to grow like this every year, I may have to get rid of them. I don't have space for plants in my garden that fizzle out in the summer.
--Sharry