What I do...
My 'winter' house for my Brugs is fully insulated ( walls, floor and roof) except for the south wall that has an uninsulated area of about 2 feet long and 18 inches wide the sun can shine in through.
I keep the temperature about 45-50F. I have remote digital thermometers at 3 different levels in there that read up here 100 feet away in the house.
I keep the plants pretty dry and when I do water, I add it around the trunks only. The only lights I have on in there are little 2 nightlights ( 5 watts each) that run 24/7 so I can see from the house that the power is on.
From my perspective...seedlings and yearlings survive the 50F but sit in front of that 'open' area and get some sun over the day at some point and grow marginally over the winter.. I do NOT cut those back if they are under 3 feet tall.
All the others get cut back to about 8-10 inch stumps and sit farther back in the room and get no direct sun.
If they start pushing new shoots, I break those off until March, otherwise they are too weak and whispy with the dirth of light in there.
In the 6 years or so I have been doing them this way, the most I lost over that storage time ( Oct-March) is 3 plants one season and one or 2 each of the other seasons.( out of 40).
The key is to not keep them too wet and not to allow the soil to dry out so much that is starts pulling in form the pot edges.
I do leave my doubles and variegated Brugs taller,, 3 leaf nodes above their first Y on their trunks but that is because they are so much slower growing, not because they can not take the dormancy. Other than that height, they too are treated in my dormant manner.
I will however say that a pure Versicolor Brug will not do well in this low of a temperature, they need it 60F+ to be
happy whether you place it dormant or keep it growing on.
When I dig them up in the fall, I dig the root ball the size of the pot I wish to put it in, the largest pot being 5 gallons.




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