Morning glories are pretty, but after a while they have, for me anyway, kind of taken over too much. I get where I cut back on the every day. When you have to have a machete to hack your way out every morning thier too much:). That was my second year. This year I'm going with about 2 seeds:)
The blue ones don't make as many leaves at the other colors. It's good to mix them a bit. The colored ones have a fuzzy leaf and stem, the blue ones are not fuzzy.
Morning glories need lots of sun, and the less fertile the soil the more flowers they produce. So don't fertilize them. The flowers will attract hummingbirds too.
Becky