The idea itself works. The protected area has much less frost on the surface.
It can be taken as two layers protection, too. I turned the bottle and saw the lower side (facing the soil) has nothing on the surface. Only the upper side facing the sky was covered by frost.
I am just thinking about how to make it even more flexible. Besides, such settings should also work if I want to use them as the roof for the chicken run?
We will have another cold front this weekend, but after that, the temperature will become milder again with longer sunlight hours. The new plants propagated from the cuttings last year are so ready now.
Autumn raspberry, I just pulled basal shoots to more or less prevent the mother plant from spreading. One pulled piece has pretty nice roots, so I potted it on. The growth above the ground looks limited, but the roots are well-developed during the winter months. Now, it sends more basal shoots.
It's a nice signal, so I removed the spent old stems and leaves. Three new stems would be sufficient to do some good jobs for this year. I guess I will do the same process, clone more plants, but grow them in the pots.
Roses from last autumn pruning
My 2016 birthday gift - although we can't keep the garden in Cologne, the cuttings propagated from the plants there will become part of our story here.
Black currants from our neighbor in Cologne

I believe we could harvest a lot of black currants from this year.
New seeds!
And chatGPT did good work in providing the information I needed.
It also knows how to end a dialogue properly, interesting.