Sir @ ctrl-alt-nwo you always shared pretty interesting gardening post with valuable information. Topiaries are plants pruned or shaped into certain forms. It is the horticultural practice of training perennial plants by clipping the foliage and twigs of trees. The word topiary derives from the Latin word for an ornamental landscape gardener.
These plants used in topiary are evergreen, mostly woody, have small leaves or needles.

Pic source Google

I am very thankful to my respectable mentor @ctrl-alt-nwo. You are very kind and generous personality for newcomer steamians.

Stay blessed
@imran498