Answer: In my experience this vine (Hydrangea anomala petioliaris) seems to take several years or longer to settle in and become established and decide to bloom. A five year wait is not unheard of, especially if the plant is growing at the shadier end of its lighting tolerance. In terms of soil, a good humusy organic soil that stays evenly moist but not sopping wet is the standard preference. If your plant seems to be healthy apart from not blooming, additional fertilizing probably would not make the difference. If you would like to boost it a bit, you might apply some good quality compost in the early spring to provide a slow release form of feeding. Take care however not to oversupply it with nitrogen as this could cause excess foliage growth at the expense of blooming -- the opposite of what you are trying to achieve. Patience is well worth it with this plant -- maybe it will bloom for you next year.
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