As a member of BGI, we pooled our knowledge and ideas for brug care. One of the best ideas to come out of this was "bubbling". For me, it's an easy method to root 'instant trees' from long cuttings of a brug. It may not work on every variety, but to me, it's worth a try to both save space and get quicker blooms. I do this in a cool room; my basement with growlight, or unheated bedroom with natural light.
Let me start with a photo of the set-up:
As you can see, it's just a $5 tall plastic kitchen trash can. Add 3 inches of water, a $7 aquarium air-pump, airline tubing and air stones or bars and you're on your way. (For each container this size I would only use 1 bar or 2 airstones) Each pump can run several setups using the gang valve.
This container has room to start about 10 trees.