It's growing good. Several vines have turned purple and the leaves yellow and not thriving. The only bug I found was a praying mantis. Morning glories are my fave and this is discouraging. Also, no blooms at all.
I don't know about in morning glory, but in tomatoes, purple and sort-of-transparent (I'd say translucent, rather) leaves tend to mean sulfur-deficiency. That's a possibility here.
Purple leaves can also be caused by phosphorus-deficiency, cold weather, and I think even magnesium-deficiency. Yellow leaves can be caused by lots of different deficiencies (pretty much everything, but nitrogen is the usual suspect). Yellowing leaves can also be caused by disease.
Epsom salt has both sulfur (sulfate) and magnesium; it's easy to find and inexpensive; so, it might be worth a try to see if it helps. Phosphorus tends to help with blooms, if you're in need of phosphorus.