Rhaphidophora korthalsii

Forest habitat of Rhaphidophora korthalsii

Rhaphidophora korthalsii has a broad native range from southern Asia through Malesia to the western Pacific. It climbs trees in lowland, hill and mountain forest, including limestone areas and freshwater swamp forest.

Young vines lie flat against tree trunks before older stems produce large divided leaves. A broad, permanent support allows the same change from close juvenile growth to a much larger climbing plant indoors.

How to grow Rhaphidophora korthalsii at home

Light

Give bright, indirect light from above and towards the board. Even light helps the young leaves stay close together; strong direct sun can bleach or scorch foliage pressed against the support.

Water

Water when the upper mix starts to dry, soaking the root ball and allowing all excess water to escape. Keep the board lightly humid near active aerial roots without leaving the pot or support dripping wet.

Humidity and temperature

Warmth and high humidity help young leaves sit flat as their roots attach. Add gentle air movement in enclosed conditions and protect the growing tip from cold draughts or hot dry air.

Substrate and pot

Use a chunky and moisture-holding aroid mix with fine bark, coco fibre and pumice or perlite. A pot that fits the root ball closely will dry more evenly than an oversized container.

Growth and support

Mount the vine against a broad, flat, textured board or slab that gives each leaf enough contact area. Tie the leading stem loosely until the aerial roots grip. Redirect any shoot that moves away from the surface before it stiffens. Choose a broad, permanent board that can carry the plant from its close shingling phase into much larger mature growth.

Long-term training and propagation

Feed lightly during active growth and extend the board before the leading shoot reaches its edge. If mature growth becomes too large for the space, prune above a leaf joint and train the next shoot onto the support. Cutting the vine back heavily may produce smaller young leaves for a time. Propagate from stem sections with a healthy leaf joint. Keep them warm and humid until they root. Repot with the support attached once the root ball becomes crowded.

Troubleshooting Rhaphidophora korthalsii

Shingled leaves lift or the stem leaves the board

Redirect the flexible leading stem onto a broader textured surface and fasten it loosely. Keep the attachment zone lightly humid until fresh aerial roots hold the vine. Do not tie the leaf stalks themselves.

The overlapping leaves become widely spaced or smaller

The vine is usually receiving too little light or has lost root contact with its support. Improve filtered light in stages, restore attachment and extend the board before the shoot reaches the edge. Later leaves should resume closer spacing.

Rapid yellowing follows a long period of wet soil

Check the roots and lower stem before adding water. Remove soft brown roots, replace dense potting mix with an airy blend and choose a pot only a little wider than the remaining root system. Warm conditions and a partly drying upper layer support recovery.

Stippling, silver scars or white clusters hide against the board

Separate the vine from the support enough to inspect the leaf backs, stem and leaf joints. Spider mites leave fine dots and webbing, thrips cause silver scratches with black specks, and mealybugs form cottony masses. Clean both plant and board, then repeat treatment until no fresh signs appear.

Rhaphidophora korthalsii is toxic to people and pets

• Keep this plant away from children, cats and dogs.
• Its leaves and stems contain insoluble calcium oxalate crystals, which can irritate the mouth, throat, skin and eyes.
• Chewing may cause burning pain, drooling, swelling, vomiting or difficulty swallowing. Contact a veterinarian or medical professional after exposure, especially if swelling or breathing problems occur.

How the name Rhaphidophora korthalsii came about

Rhaphidophora combines Greek rhaphis, meaning needle, with phorein, meaning to bear, referring to the needle-like raphide crystals in its tissues. Korthalsii honours Dutch botanist Pieter Willem Korthals, who studied the plants of Indonesia and the surrounding region.

Justus Carl Hasskarl established the genus Rhaphidophora in 1842 in Flora, volume 25, issue 2, supplement 1, page 11.

Heinrich Wilhelm Schott first described Rhaphidophora korthalsii in 1863 in Annales Musei Botanici Lugduno-Batavi, volume 1, page 129.