Hope someone can help. This is my first year growing this beautiful plant. I have two which are growing up a trellis...they're growing like gangbusters, but the leaves tend to be small and there are yellow spots all over them. Also, it doesn't seem to be flowering like the pictures that I've seen.

I water it regularly, feed it Miracle Grow every couple of weeks. My soil is slightly alkaline with a ph of about 7.3.

Any ideas/suggestions are greatly appreciated.