How can I rescue frost damaged begonias

Question

Every year I successfully manage to store and bring on my non-stop begonias. This year because of the exceptionally warm weather they were coming on so well I put them out in a covered cold frame. Temperatures rerturned to normal and we had an overnight frost – I thought they would be ok as they were under cover, but obviously not though as they have now gone brown and yucky! What should I do to rescue them? – I have about 100!

Answer 1

There isn't a whole lot you can do but this article may help: https://www.gardeningknowhow.com/plant-problems/environmental/tips-for-saving-cold-damaged-plants.htm