Red robin leaves brown and falling

Hi. I've had three red robin plants in pots for 2 years now. This winter was exceptionally cold and they were exposed to the wind. Do you think this might be why they look like this, or could it be something else? Thanks in advance for any advice!

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In summer, stand the pots in shallow dishes to help them keep a bit extra water for when the plants are in heavy transpiration mode. You will need to add slow release fertiliser such as blood, fish and bone every spring and occasionally water with liquid feed as planting composts only have food for about 90 days.
Given that more frosts are expected in some areas, I would wait to prune so you can see where new shoots form and then prune back to healthy pairs on each stem.