Plants delivered in January

[Procrastatron]

I am a fairly novice gardener having only recently been able to afford a garden (London). I really enjoyed working on my garden last lockdown and have learnt a bit and have further plans.
I won’t be winning any garden design awards, I’m largely aiming for weed suppression, colour and sentimentality.
I have ordered some plants in the Thompson and Morgan sale and they have different dispatch dates. Most are due for dispatch late March but a couple are due to be dispatched in late January and I’m pondering what to do with them whilst it’s still cold.
It’s a dwarf hydrangea (suitable for a pot) and a couple of 1ltr pots of perennial wall flowers (mauve Bowles). I think the hydrangea is simple, leave it in a pot on the patio until after the first frost but happy to be corrected.
Should I do the same with the wallflowers? I imagine they’ll turn up as pots of earth with little obvious foliage?
My small issue with the wallflowers is access. They need to go slightly behind a rose bush so it would be easier to plant them when the rose is in its cut back state. Is there a good time to do this and will they survive for now as pots in a sheltered spot in my patio?

I think both will be fine, though if your ground is still diggable I would try to get the Bowles in. Do they have to go behind the rose, I would rather have them at the front of a border, so you can see them better, also they can straggle a bit (I think this adds to their charm) so will need to be snipped back after their main flowering and this would be easier to do if they are more accessible.

I do have one alternative spot towards the front. Although I should point out that my beds aren’t that deep so I don’t have room for a back middle and front.
What do you mean by straggle?

Unless the ground is frozen I would plant them straight away. Their roots are better protected in the ground than in little plastic pots, and they won’t blow around if it gets windy.