Repotting of Buxus

Question

I have a Buxus which is in a chimney pot and has been for 8 years. It has now split the chimney pot, so I need to repot it. When I removed it from the pot, I discovered that it had a very long root ‘ball’, approximately 18 inches. I want to repot it in to a ‘normal’ type pot. If I sever the root ball by approximately half to do this, will I kill the shrub?

Answer 1

I would not take 1/2. A 1/3 would be ok and should not harm the plant much. These articles may be helpful:
https://www.gardeningknowhow.com/houseplants/hpgen/learn-more-about-repotting-houseplants.htm
https://www.gardeningknowhow.com/houseplants/hpgen/prune-roots.htm