hi everyone.

I'm looking for a little advice! About a month ago I took some Verbena bonariensis cuttings. They are in 4cm cells in a tray and have been un-covered, outside all the time. They seem to have taken well. Last night we had our first frost and while the cuttings look ok, I was wondering if there are any precautions I should take for the rest of the winter? I dont have a greenhouse!
Any comments greatly recieved!