At 22 °C, 50% humidity and light airflow, a croton right on a west sill scores 99 out of 100. A metre into the room it still reads 98. Another half metre and the estimate drops to 4,762 lux, the light is flagged as dim, and the score falls to 67. Even in June the sill doesn’t read too bright for it.
Read on 14 October 2026, the answer box at the top of Google’s results rates west as a good window for a croton, then pulls two ways: afternoon light keeps the reds and yellows, but hot summer rays can scorch, so slide it slightly back if the glass is hot. Below it, Chive wants several hours of direct sun for colour, while Lively Root and PlantVine call east or west ideal and warn that direct sun scorches. A 2020 r/houseplants thread asks why a croton in a west window won’t turn red or yellow. Nobody says how far “slightly” is.
For this plant, that missing number is most of the answer.
Great fit
This plant should be happy in this spot.
Just the right amount of light
Comfortable temperature
Humidity suits it
Airflow suits it
How far from a west window should a croton sit?
Within a metre. Here is the croton from the card, carried back from the glass with the air left alone:
| Distance from the glass | Estimated light | What the light is doing | Verdict |
|---|---|---|---|
| 0.3 m, against the glass | 7,800 lux | Just the right amount of light | Great fit, 99/100 |
| 1 m back | 6,000 lux | Just the right amount of light | Great fit, 98/100 |
| 1.5 m back | 4,762 lux | A little dim, but workable | Worth a try, 67/100 |
| 2 m back | 3,780 lux | A little dim, but workable | Worth a try, 65/100 |
| 3 m back | 2,381 lux | A little dim, but workable | Worth a try, 63/100 |
| 3.5 m back | 1,890 lux | Too dim here | Not the best fit right now, 47/100 |
The whole drop sits in the half metre after the 1 m row. Light goes from 6,000 lux, which reads as just right, to 4,762, which reads a little dim, and the score from 98 to 67. It eases down to 63 at three metres, then drops to 47 at three and a half, where 1,890 lux is too dim.
A metre and a half is about five feet, which is what most people picture when a care guide says a few feet back. For a croton that step costs a whole band. Plant Addicts’ advice to put it directly in front of the window is the version the table backs, and “slightly back” is safe while slightly stays under three feet.
A Bambino fiddle leaf fig at this glass hits its edge in the same half metre, and that page follows the one-metre spot through the year, so this one stays on the sill. Our lux column is estimated from which way the glass faces, the distance and a cloudless day, so in your room the step may sit a little closer in or further out.
Is afternoon sun too much for a croton in a west window?
Not by the light level. The figures other sites publish for a croton lean the same way. Here they are, copied as each source prints them:
| Who publishes it | What it says a croton needs | What the figure is |
|---|---|---|
| getgrowli.app | 4,000–8,000 lux | Its 'Bright Indirect' tier, a band the site prints for several plants, not a croton-only figure |
| getgrowli.app | 400–800 fc | The same tier band in foot-candles: bright, but indirect |
| foliage-factory.com | approx. 20,000–40,000 lux | Product page for Croton 'Petra': very bright, some direct sun |
| mrec.ifas.ufl.edu | 3000 to 5000 ft-c | UF/IFAS production level for potted crotons in commercial greenhouses; read from a web.archive.org copy dated 13 August 2025, the live page now returns 404 |
| mrec.ifas.ufl.edu | 6000 to 7000 ft-c | Upper production level, acceptable only if high temperatures can be controlled; same archived page |
| lifetips.alibaba.com | 1,500–2,500 foot-candles | Target for a black croton at peak daylight; content site, no source given |
| lifetips.alibaba.com | 1,200 fc | Level below which it expects fading and stretched stems; same unsourced page |
| bloomingexpert.com | 200 foot-candles (FC) | Level below which it says the plant stops keeping its leaf pigments |
The table runs from colour floors up to greenhouse levels. At the low end, Blooming Expert says a croton stops keeping its pigments below about 200 foot-candles, which converted lands between our 3 m and 3.5 m rows, the same step where our score drops to 47. At the top, the University of Florida’s production notes give 3,000 to 5,000 foot-candles for commercial growing and accept 6,000 to 7,000 “provided high temperatures can be controlled.” That is several times anything in our west-room estimates.
Nothing in the table describes a croton getting too much light at a window, and our scoring agrees: the June sill in the season table below reads 9,360 lux and a full 100. The colour sources and our dim flag both point toward the glass. If leaves mark after a move, the answer box’s tip about bringing the plant into the beam over a week or two is the one aimed at that. Stepping back past a metre swaps the risk for dim light.
Does a west sill give a croton enough light in winter?
Not for the three darkest months at latitude 40, the line through Denver and Madrid. Here is the west sill from the card on the 21st of eight months:
| The 21st of | Estimated light | What the light is doing | Verdict |
|---|---|---|---|
| January | 5,070 lux | A little dim, but workable | Worth a try, 67/100 |
| February | 6,377 lux | Just the right amount of light | Great fit, 98/100 |
| March | 7,754 lux | Just the right amount of light | Great fit, 99/100 |
| June | 9,360 lux | Just the right amount of light | Great fit, 100/100 |
| September | 7,777 lux | Just the right amount of light | Great fit, 99/100 |
| October | 6,303 lux | Just the right amount of light | Great fit, 98/100 |
| November | 5,023 lux | A little dim, but workable | Worth a try, 67/100 |
| December | 4,551 lux | A little dim, but workable | Worth a try, 66/100 |
From February to October the sill holds a great fit, with June the brightest at 9,360 lux. November drops to 5,023 lux and 67, and December’s 4,551 reads 66: the same little-dim flag the 1.5 m row carried in the first table. January sits at 67, and by February the sill is back to 98.
There is nowhere further in to go, because every spot behind the sill gets less. We also ran the sill at latitudes 30 and 45, and both lose November to January the same way. At 50 degrees, February and October drop out too.
Cold lands on top of that. In our scoring a croton’s comfortable air runs from 20 to 29 °C, and at 19 °C even a sill with full light reads only worth a try. A December sill at 18 °C carries both flags at once, dim and cool. Leave the pot where the light is and keep the night chill off it: curtain drawn after dark, plant on the room side.
What does a hot west sill do to a croton?
It costs more than the light ever does. Leave the sill’s light alone and raise only the air temperature: a great fit up to 29 °C, worth a try at 30, not the best fit at 33. July afternoons are when a west sill gets there.
Stepping back, the usual fix, barely works for a croton. A metre in at the same 30 °C is still worth a try. At 1.5 m the light flag takes over, and the spot reads worth a try whether the room is 22 °C or 26. On a hot afternoon this plant can swap one flag for the other but can’t shed both.
What keeps the great fit is the sill with the heat taken off: a blind for the worst hour, or a room held under 30, though our scoring has no input for a blind. The monstera page runs the same sill through a range of temperatures and finds its warm edge in the same few degrees. A monstera can then retreat three metres without losing light; a croton has one.
Would a croton do better in a south window?
Only away from the glass. On the sill the two windows score within a point of each other; further in, south gives far more room. In our scoring the great-fit strip is about half a metre deep at east glass, a metre at west and two metres at south, and a north window never gives a croton one at any distance. A croton at a south window has twice the floor to work with.
Our west window guide puts croton among the plants that can take the afternoon beam, and the full-sun plant guide scores it on a bare south sill. The bright-indirect page shows what the gentler treatment costs: a croton set a metre back from bright glass that gets no direct sun reads only worth a try.
Will your own west window read like these tables?
Probably not exactly. Every row assumes bare glass and a clear, unblocked sky. An eave, a tree, a neighbour’s wall or a fly screen takes light off every row, and with a croton that pulls the one-metre edge closer to the glass. The free spot checker will score your own window, with your local weather.
Published October 14, 2026
