I haven't done that because I don't have the problem but it sounds like an
idea worth trying to me if it is not going to be too expensive. How big
would the cold frame have to be?
David
Something like a 4ft diameter circle for each plant.
You should be able to do that with a polypipe frame and cover with clear
plastic for not much money. It would last a few seasons and tell you if the
idea is going to work.
David