We are quite up north (55 to 58 N latitude, which on a map places us on around the same level as central, slightly S Canada). Temperatures mostly are around or little above -10 C, but can drop till -25 C. Days during winter are extremely short and mostly cloudy.
Since I do not own a piece of land I am planing to store them on my 3rd floor balcony which faces S/SE. Probably in a container with extra soil and Sphagnum moss.
