Thanks Franc. Will give that a try. Cut off the wilted stuff (the parts that haven't yet yellowed) but are just laying there or cut them all off?
Yes, remove any wilted or yellowing. The plants are over extending the root system which likely lost some viability when they got cold.
Prune back vigorously.
Cover with plastic bags to reduce evaporation stress
Put in low light to temporarily reduce metobolic stress
And this will let the roots heal and catch up to smaller plant demands.
Place in sunny locations and they should take off.
Caution, Oregano does not like it's roots to be in water. Be careful not to overwater.