Xanadu Philodendron

How to care for Xanadu Philodendron

Light

Thaumatophyllum xanadu thrives in bright, indirect light and will produce the largest, most deeply lobed leaves under these conditions. It tolerates moderate shade reasonably well, making it suitable for interior positions a metre or two from a window, though growth will slow and leaf lobing may be less pronounced. Direct summer sun through glass should be avoided as it can scorch the foliage, but a few hours of gentle morning sun is generally tolerated.

Watering

Water thoroughly when the top 2 to 3 cm of compost has dried out, then allow excess to drain freely from the pot. Overwatering is the most common cause of decline; the plant is susceptible to root rot if left sitting in waterlogged compost. Reduce watering frequency in autumn and winter when growth slows, but never allow the root ball to dry out completely. Use room-temperature water and, where possible, allow tap water to stand overnight to off-gas chlorine.

Soil and potting

A well-draining, aerated aroid mix is ideal. A suitable blend combines two parts peat-free multi-purpose compost with one part perlite and one part orchid bark or coarse horticultural grit. Good drainage is essential to prevent root rot while still retaining enough moisture to sustain growth. Avoid heavy, compacted composts that hold excessive moisture around the roots.

Feeding

Apply a balanced, water-soluble fertiliser at half the recommended strength once a month during the active growing season from spring through to early autumn. A fertiliser with an NPK ratio of around 20-20-20 or one formulated for foliage plants is suitable. Do not feed during winter when the plant is resting, as unused nutrients accumulate in the soil and can cause root burn.

Humidity and temperature

This plant prefers moderate to high humidity of 50 to 70% but is more tolerant of typical indoor humidity than many tropical aroids. In dry interiors, particularly during winter when central heating is running, misting the leaves occasionally, placing the pot on a pebble tray filled with water, or using a room humidifier can help. Keep the plant away from cold draughts, radiators, and air-conditioning units. It prefers temperatures between 16 and 27 C and will suffer damage if exposed to temperatures below 10 C for any prolonged period.

Repotting

Repot every two to three years in spring, or sooner if roots are visibly emerging from the drainage holes or circling the base of the pot. Choose a new container only one pot size larger, as an overly large pot increases the risk of waterlogging. Use fresh aroid compost and water well after repotting. As the plant matures it forms a dense clump with a woody base, so handle it carefully to avoid snapping stems.

Pruning

Minimal pruning is required. Remove any yellowing, dead, or damaged leaves by cutting the petiole cleanly at its base using sterile scissors or a sharp blade. Avoid pulling leaves off, as this can damage the main stem. Light tidying throughout the year is sufficient to keep the plant looking neat. If the plant becomes too large for its space, stems can be removed at the base, but the overall clumping form is best preserved by minimal intervention.

Is Xanadu Philodendron toxic?

Common problems

How to propagate

Division

At repotting time in spring, separate offsets or distinct clumps from the parent plant, ensuring each division has a healthy root system and at least two or three stems. Pot each division into fresh aroid compost and keep it warm and humid while it establishes.

Stem cuttings

Take a stem cutting that includes at least one node and, ideally, one or two leaves, and allow the cut end to callous for a few hours. Place the cutting in moist perlite, sphagnum moss, or water and maintain warmth and humidity until roots of 2 to 3 cm develop before potting on.

Where Xanadu Philodendron comes from

Native to Brazil South, Paraguay.

Story and origins

The genus name Thaumatophyllum derives from the Greek words 'thauma', meaning wonder or miracle, and 'phyllon', meaning leaf, a reference to the remarkable lobed or divided foliage characteristic of the genus. The species epithet 'xanadu' is an allusion to the legendary, idyllic realm of Xanadu, itself derived from Shangdu, the summer capital of Kublai Khan's Yuan dynasty in China, and popularised in English through Samuel Taylor Coleridge's 1816 poem 'Kubla Khan'. The name was applied by the Australian nursery that patented the plant, intended to evoke an exotic, lush paradise suitable for a plant of this attractive appearance.

Thaumatophyllum xanadu was first brought to wider horticultural attention through its commercial release by the House Plants of Australia nursery in Perth, Western Australia, during the 1980s, where it was patented under the cultivar name 'Winterbourn'. For a considerable period, the plant's wild origins were disputed and it was thought by some to be a nursery-raised hybrid or selection. Botanical investigation eventually confirmed that it originates from Brazil, where it grows as a terrestrial plant in seasonally dry to moist forests. Its taxonomic home was revised in 2018 when a major molecular study led by Eduardo Gonçalves and colleagues transferred several large-leafed species out of Philodendron and into the resurrected genus Thaumatophyllum, placing xanadu alongside species such as T. bipinnatifidum. The plant remains one of the best-selling foliage houseplants worldwide.

Varieties to know

Thaumatophyllum xanadu 'Winterbourn'

The original cultivar name used in Australia before the plant became widely known as Xanadu; some nurseries still sell plants under this name, and it is botanically the same plant.

Thaumatophyllum xanadu 'Golden Xanadu'

A cultivar with yellowish-green to golden-toned foliage rather than the standard deep green; requires slightly more light to maintain its colouration.

Fun facts

• Thaumatophyllum xanadu was reclassified from the genus Philodendron to Thaumatophyllum in 2018 based on molecular phylogenetic studies, though it is still widely sold under the old name.
• The plant was patented and introduced commercially by the House Plants of Australia nursery in Western Australia during the 1980s, and for many years its exact wild origin was debated.
• Its natural habitat in Brazil was not formally confirmed until relatively recently, as early cultivated populations in Australia were thought by some botanists to be a garden hybrid or selection.
• Unlike many aroids grown as houseplants, Thaumatophyllum xanadu rarely produces aerial roots indoors and does not exhibit the vining habit common to many of its relatives in the broader Araceae family.
• The genus name Thaumatophyllum means 'wonder leaf' in Greek, a reference to the striking, deeply dissected foliage shared by members of the genus.

Xanadu Philodendron FAQ