I have what I believe to be a Yucca aloifolia. I bought it as a sad
looking shoot in a supermarket about 17yrs ago and it has now grown to
about seven feet tall. It has outgrown its small conservatory and I
am wondering if it is possible to prune the top section so that it
fits the space once again.

I tried placing it outside for the summer but here in the north of
Scotland we have had such a dismally wet, cold and windy summer that
it has suffered badly. Many of the upper leaves have browned and
become tattered. A pruning would help tidy it up as well as helping
size-wise.

Any advice gratefully received,
Compo.