Christmas Cactus roots
Hi, this is my first post.  I have 2 beautiful Christmas Cactuses.  They are healthy, they bloom, they're huge and gorgeous.  Only thing: I wonder about their dirt/roots.  It looks really old and the plant "roots" (like the base of the plant that comes out of the dirt) is showing and I wonder if they need to be repotted.  They are old plants, maybe 7-10 years old.  I don't have a green thumb at all.  I'd hate to disrupt them unnecessarily and kill them.  I tried to attach a photo but was unsuccessful.  So I guess my question is; do you think it's ok to leave them alone as long as they are flourishing?  

And what would be the symptoms when they DO need to be repotted? 

Thanks, hope my question/s make sense.
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    Paris Lalicata Hi Sheri! Usually when a plant has become root bound in the container or the roots start poking out of the drainage hole it's time to repot. However, it's always best as well to repot plants annually since nutrients degrade in the soil overtime, and the overall quality of soil diminishes and becomes less absorptive. Usually for Christmas cacti however, they like becoming a little tight in their containers (this also helps promote blooming) and actually won't need to be repotted for every 2-3 years since Cacti are not heavy feeders. I would recommend aerating the soil at each watering to prevent the soil from becoming so compact which sounds like what may have happened here! It's hard to know what you're talking about without getting a visual, but if it's been more than 2-3 years and the plants pot bound I would repot into a container that is 1-2 inches larger with fresh soil!