Q.Ponytail Palm – Caudex
I have several smaller ponytails. Some have a larger caudex, others have no caudex at all. Is there a way to encourage the caudex to grow larger? One nursery told me it just comes with age, but my plants with the largest caudex are also my youngest. Any advice is appreciated. Thank you!

Proper care and growing conditions and your plants will grow.
Here is a link to refresh you on the care requirements.
https://www.gardeningknowhow.com/houseplants/ponytail-palm/ponytail-palm-care.htm