Tetrapanax papyrifer Seeds | Rice-paper Plant
LATIN NAME: Tetrapanax papyrifer
COMMON NAME: Rice-Paper Plant
Plant Profile
The rice-paper plant is grown for something the rest of the garden never asks of a shrub: the soft white core of its stem. Slice a mature stalk across and the pith comes away in a cylinder that is then pared, with a razor and a steady hand, into sheets thin enough to glow. Those sheets have carried Chinese and Japanese brush painting and artificial flowers for two centuries, and they are the only reason the plant reached Western glasshouses at all.
Tetrapanax holds a single species, and there is little argument left about where it belongs. The genus sits in Araliaceae beside Fatsia, Aralia, Kalopanax and, surprisingly to many growers, the ginsengs of the genus Panax. The plant was described for European science by William Jackson Hooker in the middle of the nineteenth century from material grown in Britain, under the name Aralia papyrifera.
The leaf undersides and the young stems are covered in stellate hairs, star-shaped trichomes that give new growth a woolly, rust-coloured bloom; rub a leaf and the felt comes off on the fingers. That indumentum, together with the deeply lobed blade and the stout, sparsely branched trunk, separates it at a glance from Fatsia japonica, which carries plain green leaves without the brown felt.
To make the paper, cut a stem in the season when the pith has set, remove the outer bark, and slice the cylinder into coins that are then pared with a sharp blade into flat, translucent sheets. Artists prize the surface because it takes ink without bleeding, and artificial-flower makers use it because it can be pressed into petals while still slightly damp.
The same pith has a separate life in the Chinese materia medica, where it is dried, sliced and decocted as a diuretic, often combined with other herbs in formulas for water retention. The stems are harvested when the pith is firm and dried in the shade before slicing, and the material is traded by diameter and cleanliness rather than by leaf.
Science & Biotechnology
The family is rich in oleanane-type triterpene saponins, the foam-forming glycosides that give Araliaceae their soapy taste and much of their pharmacological reputation, and the pith carries a soft matrix of polysaccharide and starch. Research on the genus has followed those two threads: the saponin fraction for its biological activity, and the pith for the physical properties that make it cuttable.
Molecular work has sorted the old catch-all genus Aralia into a series of smaller, better-defined groups, and Tetrapanax came out of that reorganisation as a lineage of its own rather than a subgenus of anything else. The same body of work placed the ivy family beside the carrot family, which is why the flowers of both look like tiny umbrellas rather than like bells.
Two named selections dominate the catalogue. The one sold as Rex has broader, more heavily textured blades, and the selection known as Steroidal Giant carries leaves that are simply enormous. Both are propagated from divisions, and both will run if the ground suits them, so choose the site with the rhizome in mind rather than the leaf.
Uses & Benefits
Because a single species must supply the whole ornamental trade, the rice-paper plant is a case study in vegetative propagation. Nurserymen lift and divide the rhizomatous offsets, root hardwood and soft cuttings in a warm frame, and use nodal culture in tissue for the large-leaved selections, all of which must be kept true because seed does not come true to a chosen leaf shape.
Growing from Seed
Few plants deliver a tropical silhouette in a temperate garden as cheaply. The enormous lobed leaves on their long stalks open to a width that stops visitors, and the plants sucker sideways from stout rhizomes to build a colony. The crown of creamy flower clusters opens late in the season and is followed by small dark berries, so the display runs on after the leaves have finished their work.
Sow fresh seed on the surface of a gritty, free-draining mix, press it in lightly and keep both the medium and the air warm and humid. The seed is short-lived, so old packets are a gamble. Once the seedlings show their first divided leaves, pot them on individually; handle them by the leaf stalk rather than the crown, because the growing point bruises easily.
Hard frost will cut the top growth to the ground in cold districts, and the plant comes back from the rhizome under a deep mulch of bark or straw. In mild gardens it keeps its leaves and simply looks better for a spring tidy; prune out the spent flower stems and remove any sucker that has wandered into a path. Feed lightly with a balanced dressing as growth restarts, and keep water generous in the growing season and less in winter.
Glasshouse and conservatory plants are prone to two-spotted spider mite in dry heat, which shows as pale speckling on the upper leaf; raise humidity and wash the undersides. Outdoors the worst damage is mechanical. Slugs and snails rasp young shoots in wet weather, so ring the crowns with grit or ash while the shoots are soft.
Our Take
Give this plant more room than you think it needs, and put it where you will see the leaf undersides against evening light, because the brown felt is half the show. Two close relatives from the same family are worth the same ground: Fatsia japonica and the spiny-stemmed Kalopanax septemlobus. I also grow Aralia elata for its edible spring shoots, and note that strains sold as Tetrapanax papyriferus are the same plant under the older spelling.
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