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Perennials in 9cm pots

I've just received some Heleniums and Salvias in 9cm pots and v healthy specimens they are too. My dilemma is that I haven't decided on a permanent planting spot yet ( but I had to have them!????) I will wait till spring to plant them out but I want them to survive the winter. Will they survive in their current pots if placed somewhere sheltered or do I pot them into larger pots and place somewhere sheltered. I have a cold frame and a makeshift one covered in thick polythene.
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I would pot them into bigger pots and put them in the cold frame. Heleniums should be hardy. Salvias - depends on variety.
thanks B-L, the salvias are nemorosa ' Ostfriesland'. I can't wait to plant them with the Heleniums which are 'Moerheim Beauty'. Should look good together when I can decide where to put them.
Nemorosas are hardy too, but while they are babies in pots I'd still put them in the cold frame. They should look lovely, even better the year after.
Will do Verdun, I'm going to need a bigger garden at this rate! I wonder if next doors need theirs??
This one always confuses me. I had read that you shouldn't pot things on at this time of year, because the roots won't grow in to the new space and all that will happen is that the plant will sit in wet compost - not good. On the other hand a 9 cm pot is not much protection for the roots if we get any icy weather...what to do
But if the cold frame has a lid they can be protected from the rain so avoiding excess wet and the extra compost will provide more protection.