Philodendron Xanadu (Thaumatophyllum xanadu) care

Aroids · easy to keep

Last updated 26 October 2026

Sold as Philodendron 'Xanadu': a compact, self-heading plant that forms a dense mound of glossy, deeply lobed leaves — the tree philodendron's look at a size that fits a room. It doesn't climb and builds little trunk, and it is one of the toughest plants in the group.

Quick facts

Water

Water weekly. Water when the top third of the pot is dry. Philodendrons wilt visibly when genuinely thirsty and recover within hours, which makes them easy to read.

Light

Bright indirect to a couple of hours of direct sun.

Humidity

Fine at room humidity, faster growth above 60%.

Soil

Loose, airy aroid mix with plenty of bark and perlite.

Feeding

Balanced liquid feed at half strength every third watering through the growing season.

Repotting

Repot every 1.5 years.

Toxic to pets

Toxic to cats, dogs and people if chewed — the sap carries insoluble calcium oxalate crystals, which burn the mouth and throat. Keep it off the floor if anything in the house tastes its way through life. The ASPCA's plant list does not include Thaumatophyllum xanadu (checked 26 October 2026).

Difficulty

Easy.

Mature size

60–90 cm tall, spreading to 1.2 m.

Native to

Brazil.

Watering a Philodendron Xanadu

Water weekly. Water when the top third of the pot is dry. Philodendrons wilt visibly when genuinely thirsty and recover within hours, which makes them easy to read.

That cadence is the one PlantParlour sets for this species when you name it, and it is deliberately on the cautious side — a plant that asks a day early is safer than one that asks a day late. Log each watering and the reminder moves with the plant rather than with the calendar.

Light

Brighter than most philodendrons: this is a self-heading plant from open forest edges, and it will take morning sun happily. In dim light the leaf stalks stretch out until the plant flops.

Humidity and temperature

Fine at room humidity, faster growth above 60%. Central heating in winter is what turns a comfortable room into a dry one, and it is the usual reason an established plant suddenly browns at the edges or picks up spider mites.

Soil and potting

Almost all of them climb or creep rather than sit in deep soil, so the roots want air. Half potting compost, half bark and perlite is the standard recipe. Crawlers like gloriosum want a shallow wide pot rather than a deep one — the rhizome runs along the surface.

Feeding

Balanced liquid feed at half strength every third watering through the growing season. Stop feeding in autumn and start again when you see new growth in spring — feeding a plant that isn't growing just builds up salts in the pot.

Repotting

Repot every 1.5 years. Every second spring, one size up. It grows as a clump rather than on a trunk, and the clump can be divided when you repot.

Common problems

• Long bare stems with leaves far apart

  Too little light. The plant is reaching.

  Fix: Move it brighter and cut the leggy growth back — it will branch from the nodes below the cut.

  Leggy, stretched growth: how to read it on any plant

• Yellow lower leaves

  Usually overwatering; occasionally just age, one leaf at a time.

  Fix: If several go at once, check the roots. Brown and soft means rot; trim them and repot into fresh airy mix.

  Yellow leaves: how to read it on any plant

• Variegation fading back to plain green

  Not enough light for the plant to afford the white tissue.

  Fix: Give it more light, and prune back to a node that still shows variegation — the plant grows on from the last variegated point.

  Variegation fading: how to read it on any plant

• Brown tips on new leaves that were fine in the old pot

  Low humidity while the leaf was still unfurling.

  Fix: Group plants together or run a humidifier while new leaves open; the damage is cosmetic and permanent on that leaf.

  Brown tips and edges: how to read it on any plant

Propagation

Stem cuttings root readily: take a section with at least one node and a leaf, and put it in water, perlite or damp sphagnum. Crawling species are divided instead, by cutting the rhizome between two growth points.

A cutting taken in PlantParlour keeps its link to the plant it came from, so a propagation years later still traces back to the mother plant — which is the point if you ever sell or trade it.

Toxicity and safety

Toxic to cats, dogs and people if chewed — the sap carries insoluble calcium oxalate crystals, which burn the mouth and throat. Keep it off the floor if anything in the house tastes its way through life.

The ASPCA's plant list does not include Thaumatophyllum xanadu (checked 26 October 2026).

Every houseplant in the library the ASPCA lists as non-toxic to cats and dogs

Questions people ask

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Or browse every plant in the library.