Root-pruning a potted citrus?
I've a 22 year old citrus tree/plant that desperately needs attention. It summers outdoors in light shade and winters indoors. It hasn't been repotted in about 10 years. The top has been pruned, but not very well. I'd like to try to rejuvenate this plant as my son grew it from seed when he was very young, so it has sentimental value. Can anyone advise?