Epiphytes - high-rise plants

Discover the hidden world of arboreal plants, which get a leg-up in the world by living on trees.

Discover the hidden world of arboreal plants, which get a leg-up in the world by living in the trees.

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Victoria University of Wellington PhD student Tom Dawes says ten percent of the world's plants have forsaken the ground to live in the tree tops, a place that fellow ecologist K.C. Burns describes as a 'hidden world.'

Life in a forest is a race to the top, to get as much sunlight as possible - and by starting life in a tree, epiphytes are getting an advantage over their competitors.

Epiphytes have various strategies for life at a height.

Some arrive as seeds or spores blown on the wind, while others are deposited by obliging birds dropping seeds in their, well, droppings.

Some such as leathery-leaved climbing ferns scramble over tree trunks in the mid canopy, neither touching the ground or reaching the sun. The make do with whatever nutrients the rain washes in.

Other species, such as New Zealand's mostly flame-red mistletoes, are semi-parasites. They tap into their host's branches to steal food and water, but prefer to perch in the very canopy of the tree to claim a share of the sunlight that they also use for photosynthesis.

Some species such as puka, Griselinia lucida, are equally at home on the forest floor or in the crook of some high branches. From there, they send down long roots that grow into the soil.

Other species begin on the ground and then scramble skywards.

Astelias, or nest epiphytes, create their own miniature world, trapping water and rotting humus to feed themselves.

Tom and K.C. recommend looking up next time you're walking in the bush - you might be surprised with how many epiphyte species you find.

They recommend Otari Wilton's gardens in Wellington as a great epiphyte-viewing place.

Mistletoe rescue mission

Hear about a pioneering attempt to translocate mistletoe into Zealandia sanctuary.

Listen to the full podcast to hear plenty of interesting anecdotes about epiphyte lifestyles.

Go to this episode on rnz.co.nz for more details