Philodendron radiatum aka Split Leaf Climber

At the species level, no extension or botanic-garden source consulted rated the cultivation difficulty of Philodendron radiatum specifically. Genus-level guidance from NC State Extension treats philodendrons as relatively easy to grow indoors as long as bright indirect light, warmth and humidity are provided.

Mature leaves are large and dramatically lobed: the CATE Araceae description records a triangular-ovate blade 15–101 cm long with deeply incised-lobed margins, and Useful Tropical Plants reports adult leaves up to 90 cm long and 70 cm wide. Wikipedia notes the climbing stems can reach roughly 25 m on host trees in the wild; juvenile leaves are small and heart-shaped, transforming as the plant matures.

Genus-level guidance treats philodendrons as warm-tropical: NC State Extension cites an ideal range of 65–85°F (18–29°C) and notes that the plants are sensitive to cold and drafts. Useful Tropical Plants describes P. radiatum as a lowland tropical species growing from sea level to about 700 m elevation, indicating it has no frost tolerance. Aim for typical warm indoor room temperatures and protect from cold drafts.

Yes. The CATE Araceae description (via GBIF) records a typical aroid inflorescence with a creamy-white staminate (male) zone and a whitish pistillate (female) zone, ripening to white, somewhat translucent berries. As with most aroids, flowering rarely occurs on indoor specimens.

Plants of the World Online recognises two accepted infraspecific varieties: Philodendron radiatum var. radiatum and Philodendron radiatum var. pseudoradiatum (Matuda) Croat.

Useful Tropical Plants describes P. radiatum as a lowland tropical climber, suited to tropical and warm subtropical gardens with moist, humus-rich, well-drained soil and partial shade. Provide a sturdy host (mossed pole, tree trunk, or trellis) since the plant climbs by aerial roots and Wikipedia notes wild plants can climb host trees to about 25 m. Frost tolerance is not reported, so the species is unsuitable for areas with freezing winters.

Wikipedia's genus account recommends periodic leaf-wiping with a damp cloth to remove dust, which is especially helpful for P. radiatum given its very large blades. Avoid leaf-shine products and handle the leaves gently; wash hands afterwards because all parts contain irritating calcium oxalate crystals.

Useful Tropical Plants lists fresh seed (germination optimum around 20°C), stem-tip cuttings, leaf-bud cuttings, and air layering as effective propagation methods. Wikipedia's Philodendron article adds that stem cuttings with at least two nodes root readily in a sand-peat mix at 21–24°C, or in water within four to five weeks. Take cuttings in spring or early summer for the best results.

Wikipedia's Philodendron article documents beetle pollination by Cyclocephala or Erioscelis species. The inflorescence emits floral pheromones that attract male beetles, which become dusted with pollen as they leave and carry it to other receptive inflorescences. This is the typical mechanism across the genus.

No. Useful Tropical Plants records 'no known' edible uses for P. radiatum. Like other Araceae the plant contains insoluble calcium oxalate crystals that produce a needle-like burning sensation in the mouth and throat if eaten raw. Do not eat any part of the plant.

Useful Tropical Plants reports a single traditional medicinal use: a decoction made from the leaves is added to baths to treat rheumatic pain and rickets. There is no clinical evidence for these uses and the plant is otherwise considered toxic if ingested.

Useful Tropical Plants notes two non-medicinal uses: the long aerial roots are employed in basket making, and in Guatemala the very large mature leaves are used as altar decorations.

Split Leaf Climber’s native range is Central, South America, and the Caribbean.

Split Leaf Climber should be watered regularly, allowing the soil to dry out between waterings.

Split Leaf Climber loves a well-draining soil. Perlite and vermiculite help with drainage, while coco coir adds organic matter, so a good potting soil mix will have all three. You can improve store-bought soil by adding some perlite to it.

To ensure optimal growth, the Split Leaf Climber prefers bright indirect light for 6-8 hours each day. Insufficient light can result in slow growth and leaf drop, so it's important to find a well-lit location for this plant. Place it near a window, within a distance of 1 meter (3 feet), to enhance its potential for thriving.

The Split Leaf Climber does not need extra humidity. Plants primarily absorb water through their root system, making soil watering the best way to provide humidity to your plants.

The Split Leaf Climber should be repotted when it has doubled in size or annually, whichever comes first. Providing fresh potting soil with all the essential nutrients each year ensures the plant's well-being, eliminating the need for fertilizer. Remember, plants derive their energy from the sun and not fertilizer.

Split Leaf Climber is poisonous if ingested. We suggest keeping this plant out of reach if you have children, cats, or dogs in the home.

The Split Leaf Climber lacks a typical dormancy pattern. If there is a marked reduction in growth, ensure that the plant is receiving enough sunlight and water to thrive.