Where have all the 'Heavenly Blues' gone?

Each year I plant morning glory seeds at the posts of our split-rail fence in the front yard. The seeds never disappoint with the green vines covering the posts in less than two months.

This year, even though I planted the same "Heavenly Blue" variety, the vines are not producing flowers. Compare last year's vines with this year's.

One theory is that the heavy rains knocked off the tender blooms. Our neighbor said that is what happened to his apple trees. As I continually remind myself, Ma Nature only gives what she wants.