What to do with Pansey seedlings

I have been given lots of small pansey seedlings that don't seem to be growing. I have potted them on but they still don't seem to be getting any bigger! Can I keep them in the greenhouse over winter and plant them in spring when they decide to grow bigger? What sort of care should I give them to encourage better growth.

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Dont be temped to feed them, they are resting now.
When they’ve finished in your tubs and baskets you can cut them right back and plant them out in the garden, I’ve got some here that have been coming up each year forever.
Even the hardiest and toughest of plants are susceptible to all sorts of pests and diseases when they're little.
I live in west central Scotland - not where that photo is...