Hi Wobur ... .it is my experience that morning glories and members of the Impomoea family do NOT like really great soil. The very best moonflowers and morning glories I ever had were in what I would term really bad soil that had been reused for about 5 years. The bigger the leaves grow and the more plentiful, the fewer the blooms. This year is a bad year for aphids and thrips up here in TO ... but in spite of that, plus depleted light (building going up across from me!) I have 12 buds on just ONE of my moon flower vines. Keep your fingers crossed for sure...it may happen yet.

sprinkle a little bonemeal around their flowerbed and water it in...the sudden boost in P should put them into fruiting mode.

watch out though, bonemeal/bloodmeal has been known to attract wildlife looking for a free meal, lol.