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In Ireland, Hibiscus syriacus is not as successful as in warmer countries.
The problem would appear to be the lack of warm dry summers rather than winter cold or wet. Flower buds are slow to form and often appear late if at all.
It does perfectly well in many areas of Britain and will flower here along the dryer and sunnier east coast.
In SE Newfoundland, it is uncommon to rare. I have seen it growing with a southerly exposure, about 6 feet from a house, i.e. there is some reflected heat. It is slow to emerge in Spring/Summer. Years ago, commercial interests included it as a shrub for here, but it was rarely seen in gardens after... so I have to recommend against it for SE Newfoundland. This is a short growing season area. Frost is common until mid-June, and this year there were 3 warnings in mid-July, and I have a picture of frost on a roof here on one of those mornings.