Rather like vegetables. So many of our garden plants come from overseas. I often spend time on Google looking up the etymology of our plants and vegetables.
West Cork seaside gardens often have griselina (New Zealand Privet) Hebes and Phormiums or flax. All of which originate down under in Australia and New Zealand.
I have several Phormiums growing in my gardens. Every year I always divide some and make new plants and give them an haircut so they don't need lots of watering after being cut back.
Usually I divide and cut back my Phormiums in April but it was too wet this year so I waited until Bank Holiday Monday and made eleven new plants:
New plants all potted up and they will make me 55 Euros when they grow their foliage back. Deferred plant gratification?
My plants are not middle class and sink or swim with their regeneration. Just a drink of water and old Mother Nature's propagation magic!
If you have Phormiums and they are getting tall and ragged looking. Cutting them back hard and dividing them gives you a rejuvenated plant and new plants to sell, swap or give away.
Do you divide your Phormiums or other grasses like Pampas?