Indoor Gardening and Houseplants: ponytail aka beaucarnea with glued rock potting, 2 by hcmcdole

hcmcdole wrote:
I bought a 50 cent ponytail bulb (maybe an inch across) about 20 years ago from Home Depot or Lowe's. I moved it up to each successive size pot through the years until its final home at maybe a 15 inch pot where it has resided for the last 10 years. I topped it last year because it was over 7 feet tall. I see no reason to give it a bigger pot as it is difficult to move in and out each year. In tropical areas where it is in the ground I've seen them 6 feet across or more and the one in the Atlanta Botanical Garden's atrium is the tallest I've seen (maybe 30 feet tall or more).

When should one stop moving these up to a bigger pot?

My ponytail a few years ago. The ponytail at ABG (both photos are the same with the second one cropped to show the top of this massive plant).