"Ian Keeling" wrote in message
...
When my grandfather died aged 99 my parents salvaged one of his cacti. I
didn't want to see it go, as I'd known it all my life.

Now, it's rather large (I estimate about 4' in height), though probably
not as large as it ought to be given its age, considering the size of the
pot it's in, which I rather suspect is the original one...

Presumably it would benefit from repotting, but I wouldn't want to risk
damaging it in the process (I hope I can avoid serious injury to myself).
Any tips on procedure? Or should I just leave it be? (Not sure of the
species - I think it may be Cephalocereus senilis). And would this be a
good activity on 26th December (right time of year probably?)

Until someone who knows comes along try this link and have a look at the
repotting section and the compost section.
http://www.succulent-plant.com/cultivation.html