The lifespan of shingles on a sidewall can vary depending on several factors such as the type of shingles used, climate conditions, installation quality, and maintenance. Generally, asphalt shingles, which are commonly used for roofing, can last from 15 to 30+ years if well cared. A metal trellis or wire mesh against the wall could provide a suitable climbing surface for the plant. This will protect the integrity of the shingles and provide a secure structure for the hydrangea to grow on. But the climbing hydrangea will tend to live much longer. Not sure how easy it will be to eventually replace the shingles when the time comes and the climbing hydrangea is still there. Enjoy.
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