You need to leave green material on any shoot you cut as leylandii will not regrow from brown wood.
Conifers are gymnosperms. Leylandi etc
You can prune it but the symmetrical shape that makes it attractive will be wrecked. If you do prune only tip prune.
Prune is just another word for 'cutting' i.e you cut your hair but prune a plant. So prune is to cut shorter.
A plum or a prune
yes a prune is a dried plum
in telugu prune is :all behara :
'Prune' as noun in Hindi: 'sookhi hui ber' or 'jamun'. As verb: to prune - 'chhantna, anavashyak hissa hatana' or 'katna'.
A small variety of plum that dries into a prune.
Prune Escallonia in early Spring .
You can prune chrysanthemums back after they flower in fall.
I've read to prune after flowering.