Propagation
Sow fresh seed When collected and stratified  in cold and damp compost for several months prior to sowing during spring and use no artificial heating.

Divide established clumps (rhizome) after flowering or in late spring to summer.

Note:
When planting out space 1 m (3 ft) apart to allow ample room for the large leaves to develop and avoid planting in areas where the plant can escape as it tends to be invasive.

Botanic information
Leaf: The mid to dark glossy green large leathery textured ovate-oblong leaves are up to 1,200 mm (4 ft) long with entire undulating margins and an acute to obtuse apex. The base is cuneate with a petiole up to 400 mm (16 in) long and graduates to a thick mid-rib on the underside. The upper surface has   prominent net-veins.

Note:
The water repelent leaves have a variety of uses including wraping food for baking or as a container for collecting berries. They are also dried and powderised then used as a thickening agent but care should be taken as they contain poisonous calcium oxylate. 

Flower: The small yellowish-green bisexual flowers have 4-tepals and are arranged in a (cylindrical spike) spadix that is up to 140 mm (5½ in) long and is enclosed in a larger yellow spathe that is up to 400 mm (16 in) long. They appear from late winter to early spring on a thick basal scape. The inflorescence has a skunk-like odour that persists and attracts insects for pollination.

Fruit: The small greenish berries are up to 11 mm in diameter and contain 2-grey brown to reddish seeds that persist on the plant for a short period before falling. The small seeds are viable of the plant is commonly reproduced vegetatively.