Everyone loves them for their drama and perfection. There’s fossil evidence that they’ve evolved very little for many millions of years so we’d describe them as ‘primitive’. Primitive plants have two things in common : 1. Their growth patterns are unpredictable (cf. Monkey Puzzle trees, Ginko trees and Coelacanths) and 2. They’re unsusceptible to pests and diseases. These can quite happily sit around for several years producing no new growth at all and then suddenly, one summer, transform themselves in 2 or 3 weeks with 30 lovely new fronds. When new fronds are emerging (this goes for tree ferns and one or two other plants) – if they’re in a pot – don’t move them.