by richard » 06 Oct 2012 12:50
I have a similar houseplant that grew to the ceiling and we lopped off the top 2 feet and it's grown back quite happily. Whether a Yucca would respond as well I don't know, although plants are designed to survive.
If you look at a typical Yucca the leaves sprout from a cut off trunk at the bottom, so I would suspect something similar would happen at the top if you were to attack it with a saw...