JustAnn4, sorry for the delay in responding to your question.
I have found that cold hardy, short season figs can take a lot of cold. The problem starts when the sun strikes the fig, during the day. This brings sap up from the root system. Then when the sun goes down, and it drops below 32, the sap freezes. All of our cold hardy figs planted right up against a warmed, south facing wall, have been killed to the ground, every year for the past 12 or so years. While at the same time, the same figs planted at least three feet away from the wall, are able to keep between 8 to 12 inches of top growth.
But, last winter, the figs planted at least three feet from the wall, were killed to the within 3 inches of the ground. While at the same time, a Kathleen’s black held onto about two feet of top growth. It was simply laid flat to the ground, with nothing placed on it. Also, Brooklyn White was able to hold onto about two feet also. It was out at least 30 feet from south facing wall. Although, it was able to keep about two feet of top growth, alive and green, no buds open.
So, it appears each year is different. It depends on so many different factors. How much soil moisture, wind breaks, sun exposure, last crop load, was the plant pinched at the fifth leaf. Was the fig a cold hardy fig. Was the fig a short season fig.
So far. the one constant each year is if the figs are laid down on the ground, as close to the ground as possible, it comes through the winter fine.
Any questions, I can be reached at: robertcharper@gmail.com
Bob Harper