No flowers in the Moonlight

I don’t recall when the ‘Moonlight’ Japanese hydrangea vine (Hydrangea hydrangeoides ‘Moonlight’, recently in the genus Schizophragma but helpfully changed to Hydrangea, below) was planted, but not in the recent past. Newly planted hydrangea vines often do not flower for several years, and whatever the timing a year ago was the first time it flowered….