Answer: There is often some variation in fragrance from year to year in the same mock orange plant. There is speculation as to how weather, time of day, humidity and so on may contribute to the fragrance or lack of it, but in my experience it seems inexplicable. Hopefully next year will be better!
Climbing hydrangea, Hydrangea anomala ssp. petiolaris, seems to bloom best with some direct sunlight, although it will also grow well in a shady location. One of the most important requirements is a rich and constantly moist but well drained (not wet) soil, moisture is especially important in a sunnier location.
It takes several years to become established after transplanting and may not grow much at first, so it could be that the plant is still devoting energy to that rather than to flowering. Also be sure not to prune off the current new year's growth in spring or early summer as this is where the flower buds would be forming.
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