Lacy tree philodendron leaves turning yellow: causes and what to do
17 results in the diagnosis tree begin with yellowing leaves, 7 of them marked likely when the answers fit. They are ordered here for Lacy tree philodendron (Thaumatophyllum bipinnatifidum), using what its sources say about soil moisture, light, soil, watering and feeding and 2 problems recorded for it.
Sources last read 18 September 2026.
Philodendron bipinnatifidum, synonyms including Thaumatophyllum bipinnatifidum and Philodendron selloanum, is a plant in the genus Philodendron, in the family Araceae. The species is native to South America, namely to Brazil, Bolivia, Argentina, and Paraguay, but is also cultivated as a landscape plant in tropical, subtropical and warm temperate climates. Wikipedia, CC BY-SA 4.0
Native range: E. Bolivia to SE. & S. Brazil and NE. Argentina (seasonally dry tropical). Also sold as Cut-leaf Philodendron, fiddle-leaf philodendron, Heartleaf Philodendron, Horsehead Philodendron, panda plant and Split Leaf Philodendron.
What Lacy tree philodendron’s sources say that bears on this
- Soil moisture
- Moist but well-drainedRHS · read 13 September 2026
- Light
- Medium lightClemson Extension · read 13 September 2026Partial shadeRHS · read 13 September 2026
- Soil
- Loam; pH Acid or Alkaline or NeutralRHS · read 13 September 2026
- Watering
- Salt buildup harms it, so flush the soil often, let rain fall on it, or water with distilled water. It may form aerial roots that take up water and nutrients.NC State Extension · read 13 September 2026During growth, water moderately and feed monthly with a balanced liquid fertiliser. At other times water sparingly.RHS · read 13 September 2026
- Feeding
- While growing, water moderately and feed monthly with a balanced liquid fertilizer.RHS · read 13 September 2026
How this shows up on a Lacy tree philodendron
Pale, undersized leaf blades at the tips of the stems
Older leaf blades on the lacy tree philodendron keep their colour while each new one comes in thinner, with a longer stretch of bare stem below it.
Placed darker than the medium light its source describes, the plant invests in length rather than leaf, because length is what finds a window.
Telling it apart: Spacing. A plant short of light stretches; one short of nitrogen keeps its spacing and only loses colour.
Clemson Extension · read 13 September 2026Yellowing that begins at the leaves nearest the soil
The lowest leaf blades of the lacy tree philodendron go yellow and translucent at the stalk and drop with a light pull, while the potting mix stays wet.
Its source describes soil that is moist but well-drained. Roots held below that are short of air, and roots short of air stop moving water, so the vine wilts in a wet pot.
Telling it apart: Whether new growth is affected too. Root damage shows up everywhere at once; ordinary leaf loss shows only in the oldest leaves.
RHS · read 13 September 2026Possible causes, likeliest first for a Lacy tree philodendron
Most likely not enough light
Ranked higher because Lacy tree philodendron's recorded problems point this way.
- Pale, undersized leaf blades at the tips of the stems Clemson Extension
Why: Far from a bright window, a lacy tree philodendron builds leaves it cannot afford.
What to try:
- Move it closer to the brightest window you have, over a week or two rather than in one step.Useful: grow light
- Water less while it is in low light; a lacy tree philodendron that is barely growing uses little.Useful: moisture meter
What would settle it: Compare a new leaf with one from last year. Smaller and paler, with a longer gap below it, is the reaching pattern rather than a nutrient one.
Most likely too much water
Ranked higher because Lacy tree philodendron's recorded problems point this way.
- Yellowing that begins at the leaves nearest the soil RHS
Why: Soil that is wet two inches down, under leaves that are yellowing from the bottom or falling, points at roots that cannot breathe.
What to try:
- Hold off watering until the top two inches of soil are dry, and check again with a finger rather than by the calendar.Useful: moisture meter
- Empty any water standing in the saucer or the outer pot within half an hour of watering.Useful: moisture meter
What would settle it: Lift the lacy tree philodendron out of its pot. Healthy roots are firm and pale; roots that have been wet too long are brown, soft and smell sour.
Most likely too little water
- Moist but well-drained RHS · read 13 September 2026
Why: Soil dry two inches down, under lower leaves that are yellowing or leaves that are falling, is a lacy tree philodendron shedding what it cannot support.
What to try:
- Water until it runs from the drainage hole, then let the pot drain.Useful: moisture meter
- If the water runs straight through a shrunken rootball, stand the pot in water for twenty minutes so the potting mix can take it up.Useful: moisture meter
What would settle it: Water it thoroughly and look again the same evening. A thirsty plant firms up fast. One that does not has a root problem rather than a water problem.
Less likely for a Lacy tree philodendron, still possible
- Short of nutrients
- A build-up of salts in the soil
- Cold
- Light and feeding are both plausible, and this does not separate them
- Nutrients are an unlikely explanation here
- Root rot, in a pot that has stopped draining
- Too much water, but this is not settled
- Too much water
- Too much direct sun
- Too much direct sun, or feeding
- Ordinary leaf loss
- Dry air
- The answers do not point at one cause
Questions
- What usually causes yellowing leaves on a Lacy tree philodendron?
- For Lacy tree philodendron: not enough light, too much water and too little water.
- How can I tell which one it is on my Lacy tree philodendron?
- Where is the yellowing? The lowest leaves, working upward; New growth at the top, while older leaves stay green; Between the veins, the veins themselves still green; At the leaf tips and edges, browning as it goes; Patchy, only on the side facing the window.
- What do Lacy tree philodendron's sources say about its soil moisture?
- RHS: Moist but well-drained.
- What does this look like on a Lacy tree philodendron?
- Older leaf blades on the lacy tree philodendron keep their colour while each new one comes in thinner, with a longer stretch of bare stem below it. Telling it apart: Spacing. A plant short of light stretches; one short of nitrogen keeps its spacing and only loses colour.
- Is Lacy tree philodendron safe to handle while I check it?
- Its sources list it as toxic to cats, dogs and people. Wash your hands after handling the roots or sap, and keep trimmings away from pets.
Other plants that show yellowing leaves
Dumb caneLower leaves collapse and yellow within days of a watering
- No photograph yetArrowhead plantNew leaf blades arrive smaller and paler than the ones below
- No photograph yetPeace lilySoft yellow leaves low on the plant, soil still wet
- No photograph yetHeartleaf philodendronThe leaves nearest the soil turn yellow and hang
- No photograph yetPothosYellowing that begins at the leaves nearest the soil
Something else wrong with the Lacy tree philodendron?
What this does not cover
This page orders a decision tree's results using a plant's sourced care. It has not seen your plant, its pot or its window, and two problems at once are common: that is the usual reason a confident answer turns out wrong. The questions in the diagnosis tool narrow it further than a list can.