I have two vineplants in 40-litre-pots on my rooftop garden. This will be their first winter outside and I want to protect them from freezing to death. I live in an area where there are a lot of wineyards (southern Germany), but our winters can get as cold as -10 to -15°C.
The pots are made from plastic and are about 50cm high and 30cm wide. They have holes in the bottom so the roots don't sit in water.
- The first pot is a "Jakobsberger" plant with white grapes. It is loacated against a wall facing south with sun from late morning until early afternoon (Position 1 in the image below). Behind the wall is an elevator shaft, so it might be a bit cooler than a normal house wall. The wall should provide some protection from wind. The first pot could easily be moved as it's climbing aid is free-standing.
- The second pot is a "Moldawa" plant with blue grapes. It is located against a metal wall facing west with direct sun somewhat longer than the first plant (Position 2 in the image below). The metal wall is free standing so it provides no protection from temperature changes. As the plant grows along the top side of the wall it has little protection from wind. Moving the plant would be a bit more difficult (due to the same reason of "growing along the top side of the wall").
I though about buying several meters of bubble wrap and wrapping it around the pots multiple times as an isolation. I hope this way I would get a reusable solution that doesn't take up too much storage room during summer.
Do you have other (better) suggestions?
Remark: Alternative locations for the plants would be:
- Both in the same location (one of the two described above). 1, 2
- Next to the balustrade facing south (Probably quite windy, sun from morning till afternoon) 3
- The elevator shaft wall facing west (Almost no sun in winter). 4
- The house wall facing east (our flat behind the wall, no sun after late morning). 5
- In the entrance area of the roof garden (Our flat behind the wall, not much wind, almost no sun) 6