I have 5 brugs in 20 gallon pots. How far back may I cut them for basement under lights storage??
You can cut them back as far as you need to in order to store them - they will come back when you bring them into light and start watering them. Stick your trimmings into a 5-gallon bucket of water and keep the water changed a couple of times a week - they should root in about 3 weeks.