Morning Glories: Morning Glories 2013 #05, 1 by JoParrott

JoParrott wrote:
I am confused- my MGs are all in the same conditions, but only one group is blooming- (1st photo)- they have small skimpy leaves, and the other two trellises have nice big leaves but no blooms-the middle one is showing some, but the lush one on the left only has very tiny (3rd photo) clusters of tiny buds which fall off. The stems have big growths that almost look like thorns- is that the things that grab to climb? If all I am going to get is leaves they are coming up fast! Any help is welcome.