[2] This species has a fast growth rate of up to 10–80 cm (4–31 in) a year, growing to about 6 m (20 ft) tall.

A feature of the whekī is the spreading underground rhizomes which can create dense groves, making it one of the most common tree ferns in New Zealand forests.

[4] The Latin specific epithet squarrosa means "with curving ends" (referring to the fronds).

Some protection should be considered over the winter months in climates with temperatures below 4–5 °C, e.g. shadecloth cover or straw packed in the crown.

The fronds are small and compact, making this fern an ideal container or garden plant where space is limited.