Philodendron radiatum · Plant reference

About

Philodendron radiatum is a large root-climbing rainforest vine from southern Mexico to Panama, with deeply lobed leaves up to 1 m across.

Pet safety: Toxic to cats, dogs and horses: insoluble calcium oxalate crystals cause mouth pain and swelling, drooling, difficulty swallowing and, in cats and dogs, vomiting (ASPCA, for philodendrons). General guidance for the genus
People: Harmful if eaten: calcium oxalate crystals cause pain and swelling of the mouth, lips, tongue and throat; the sap can irritate skin. General guidance for the genus

Light: Bright indirect light; direct sun can scorch the leaves. General guidance for the genus
Water: Keep the soil evenly moist but never waterlogged; overwatering leads to root rot. General guidance for the genus
Humidity: Prefers high humidity but adapts to average indoor levels; a humidifier or pebble tray helps in dry rooms. General guidance for the genus
Temperature: About 18–29 °C (65–85 °F); keep away from cold draughts. General guidance for the genus
Soil: Moist, well-drained mix rich in organic matter. General guidance for the genus
Propagation: Stem cuttings or layering. General guidance for the genus
Mature size: Climbs to about 25 m in the wild; leaves up to 1 m long.
Hardiness: Frost-tender; grown outdoors only in USDA zones 10a–12a, elsewhere as a houseplant. General guidance for the genus

“General guidance for the genus” marks advice sourced for the genus as a whole rather than this species.

Climbs to about 25 m. Leaves are ovate-triangular, up to 1 m long and wide at the base, and often cut so deeply they look almost pinnate.

Rainforests from southern Mexico to Panama.

Difficulty: Not recorded
Temperature: About 18–29 °C (65–85 °F); keep away from cold draughts.
Humidity: Prefers high humidity but adapts to average indoor levels; a humidifier or pebble tray helps in dry rooms.