Cuban buttercup, flowers daily most the year.I can think of lots of yellow, but only truly blue I know is Plumbago, and some hydrangeas. I have blue daze but it doesn't stand out like the large flowers of Plumbago. There is Blue Sky Vine, Thunbergia grandiflora.
Cuban buttercup, can take the heat and sun.
Golden Thryallis, and Chaste tree in background, more a lavender.
