Autumn is better, but you need to look at what's happened and why. I often move plants when it isn't technically the right time, but it can be easier here to keep them hydrated, and if a plant is failing, it's not great to leave them if moving them can give them better conditions. Milder wet conditions, then a sudden freeze are what does for them, especially if it's severe - ie a proper freeze, not minus five or something. They're like all the early flowering clematis - they don't like being soaking wet long term, and shouldn't be planted deeply like the large flowering ones. Poorer, drier conditions is what's best for them. It's why we plant them up against buildings here - it keeps them from getting annihilated over winter. Plenty of other planting around them also helps as it takes up excess moisture.
It's a place where beautiful isn't enough of a word....
I live in west central Scotland - not where that photo is...
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Also, if you have a Morrissons nearby they often have Montana's in stock throughout the season usually for a couple of quid.
Milder wet conditions, then a sudden freeze are what does for them, especially if it's severe - ie a proper freeze, not minus five or something.
They're like all the early flowering clematis - they don't like being soaking wet long term, and shouldn't be planted deeply like the large flowering ones. Poorer, drier conditions is what's best for them.
It's why we plant them up against buildings here - it keeps them from getting annihilated over winter. Plenty of other planting around them also helps as it takes up excess moisture.
I live in west central Scotland - not where that photo is...