Bau metallica

A metallic-leaved aroid from humid Malesian forest

Bau metallica once carried the name Schismatoglottis metallica. Its present genus, Bau, contains terrestrial forest aroids from tropical Southeast Asia, and the species is distinguished by the unusual metallic cast of its foliage.

Plants in this lineage inhabit the lower levels of warm Malesian forest. A layered canopy breaks up intense sunlight, while regular rain and humid air keep the ground layer active with roots, mosses and decaying leaves. The broad blades spread close to surrounding vegetation, where light is softened and moisture returns repeatedly.

Care for metallic foliage and fine roots

Light

Place Bau metallica where it can see a broad area of sky, ideally beside an east window or behind a sheer curtain at a sunnier exposure. Mild morning sun can reach an acclimated plant, but midday and afternoon sun may scorch the metallic-looking surface.

Watering

Check Bau metallica below the surface and water when the upper layer of the substrate feels drier while the centre remains moist. Rewet the complete root ball and allow it to drain freely.

Humidity and airflow

Bau metallica benefits from moderate to high humidity, especially while a leaf is unfurling. Average room air may keep the plant alive but often leaves dry edges or an incompletely opened leaf.

Fertilising

Apply a balanced complete fertiliser to moist mix at the low end of the product-label rate while Bau metallica is actively growing. Increase only within the labelled range when several leaves are developing under strong light and the pot is drying normally.

Repotting

Bau metallica needs repotting once roots line the container, emerge from several holes or sit in substrate that no longer absorbs and drains evenly. Repot while warmth and new growth support recovery, and divide only a naturally separate piece with its own roots.

Bau metallica leaf and crown problems

The bronze-maroon sheen looks grey or finely scratched

Metallic colour can shift as a leaf hardens, whereas thrips damage forms irregular silver scars and may leave black droppings near the newest growth. Compare old and new leaves, inspect the folded blade and isolate the plant if insects are present. Complete a labelled thrips treatment rather than treating normal colour variation.

Small growths appear on the leaf blade

Bau metallica can produce leaf-borne plantlets, so an organised green growth attached to the blade is not automatically a gall or pest. Leave it in place until it has developed enough to handle. Cottony deposits, sticky residue or removable brown bumps are different and should be checked for mealybugs or scale.

The leaf edges curl and the petiole loses tension

Dry substrate with a firm base points to dehydration; a damp mix with continued wilting suggests cold stress or failing roots. Check below the surface before adding water. Rehydrate a dry root ball evenly, but inspect roots if the plant remains limp after warmth and moisture are corrected.

New leaves stay green, small and weakly metallic

Fresh growth may need time to develop its mature colour. If several leaves remain reduced, check filtered light, warmth and root aeration rather than trying to darken the plant with harsher sun. Direct exposure through hot glass can bleach the thin surface and leave permanent tan patches.

The crown or short rhizome smells sour

Softness, darkening and an unpleasant smell indicate active decay. Remove the plant from wet substrate immediately, cut away affected tissue and retain only firm sections with clean roots or nodes. Disinfect the blade between cuts and keep the surviving growing point above the new mix.

Keep Bau metallica away from children and pets

• Keep this plant away from children, cats and dogs.
• Its effects after chewing or swallowing are unclear, and plant material can still cause an upset stomach.
• Contact a veterinarian or medical professional if symptoms develop or do not settle.

About the name Bau metallica

Bau is the Malay word for smell, chosen for the strong scent released when the plant's tissues are crushed. The species name metallica means “metallic” and refers to the foliage’s metallic sheen and colour.

Sin Yeng Wong and Peter Charles Boyce established the genus Bau in 2024 in Journal of Plant Taxonomy and Geography (Webbia), volume 79, page 263.

Sin Yeng Wong, John-Michiel Koens, and Peter Charles Boyce first described it as Schismatoglottis metallica in 2022 in Journal of Plant Taxonomy and Geography (Webbia), volume 77, page 160. Sin Yeng Wong and Peter Charles Boyce later placed it in Bau as Bau metallica in 2024 in Journal of Plant Taxonomy and Geography (Webbia), volume 79, page 266.