Right against east glass, a croton scores 98 out of 100 on an estimated 6,500 lux, in a room at 22 °C and 50% humidity with light airflow. Sixty centimetres in, the score is still 98. Ten centimetres further back, the light turns a little dim and the score is down to 68. So the croton’s best strip at east glass is a shade under two feet deep.
Read on 22 October 2026, the answer box at the top of Google’s results calls an east window a “great and safe” spot for a croton: morning sun without the afternoon heat, enough to keep the reds and yellows. If the leaves turn dull or green, it says, move the plant closer to the glass or add a grow light, and keep the air humid. One Reddit thread’s title is that warning come true: a croton that has lost its colour in an east window. Nobody puts a number on closer.
By our numbers, closer is the whole placement answer here, and the dull leaves have a season. From October to mid-March even the sill reads a little dim for this plant.
Great fit
This plant should be happy in this spot.
Just the right amount of light
Comfortable temperature
Humidity suits it
Airflow suits it
Is an east window bright enough for a croton?
First, the light figures other people publish for a croton, each copied in whatever unit its source uses:
| Who publishes it | What it says a croton needs | What the figure is |
|---|---|---|
| getgrowli.app | 4,000–8,000 lux | Its “bright, indirect” tier, the same band the app prints for several plants |
| getgrowli.app | 400–800 fc | The same tier, given again in foot-candles |
| foliage-factory.com | approx. 20,000–40,000 lux | Shop product page for croton ‘Petra’: very bright, some direct sun |
| mrec.ifas.ufl.edu | 3000 to 5000 ft-c | University of Florida notes for commercial pot production, “or higher”; read from a 2025 web.archive.org copy, the live page is gone |
| mrec.ifas.ufl.edu | 6000 to 7000 ft-c | Same archived notes: acceptable for production if high temperatures can be controlled |
| lifetips.alibaba.com | 1,500–2,500 foot-candles | Target at peak daylight for a black croton; a content site that cites no source |
| lifetips.alibaba.com | 1,200 fc | Floor on the same page: below it, it expects fading and loss of leaf contrast |
| bloomingexpert.com | 200 foot-candles (FC) | Pigment floor: below roughly this, it says the plant stops keeping its colours |
Right at the glass, yes. The sill’s 6,500 lux sits inside Growli’s 4,000 to 8,000 band and reads just right in our scoring. The catch is how wide Growli’s band is. An east window keeps the light above its 4,000 floor out to just short of a metre and a half, so by that figure the pot could stand well back. By ours, the croton’s light turns a little dim 60 centimetres in.
The two colour floors in the table sit six times apart. Lifetips’ 1,200 foot-candles is more light than any east spot gets on our estimates, the June sill included, while Blooming Expert’s 200 is still met about 2.8 metres back. Our own line falls between the two, and in an east room it lands 60 centimetres from the glass.
How close to an east window does a croton need to be?
Within 60 centimetres. Here is the same plant at seven distances from the glass:
| Distance from the glass | Estimated light | What the light is doing | Verdict |
|---|---|---|---|
| 0.3 m, against the glass | 6,500 lux | Just the right amount of light | Great fit, 98/100 |
| 0.6 m back | 6,015 lux | Just the right amount of light | Great fit, 98/100 |
| 0.7 m back | 5,743 lux | A little dim, but workable | Worth a try, 68/100 |
| 1 m back | 5,000 lux | A little dim, but workable | Worth a try, 67/100 |
| 1.5 m back | 3,969 lux | A little dim, but workable | Worth a try, 66/100 |
| 2.5 m back | 2,500 lux | A little dim, but workable | Worth a try, 63/100 |
| 3 m back | 1,984 lux | Too dim here | Not the best fit right now, 47/100 |
The line falls between the 0.6 and 0.7 metre rows, and stepping a centimetre at a time pins it at 60 centimetres: that distance holds a great fit and 61 doesn’t. Then the table goes almost flat. From 0.7 metres to 2.5 the score only eases from 68 to 63, every row worth a try, its light a little dim. It takes until about three metres for the light to read too dim and the score to drop to 47.
That plateau is easy to misread. A croton two metres back is scored worth a try, so nothing about it looks urgent. The colour floors in the table above are the warning for that kind of spot: below them, those sources expect the reds and yellows to fade.
A Bambino fiddle leaf fig draws its line between the same two rows at this glass. The two want about the same light in our care data, so an east window treats them alike.
Why does a croton lose colour in an east window in winter?
Light is the likeliest reason, and by October the sill itself has left the great-fit band. Here is that same east sill on the 21st of eight months, at latitude 40, roughly the line through Philadelphia and Beijing:
| The 21st of | Estimated light | What the light is doing | Verdict |
|---|---|---|---|
| January | 3,691 lux | A little dim, but workable | Worth a try, 65/100 |
| February | 5,019 lux | A little dim, but workable | Worth a try, 67/100 |
| March | 6,455 lux | Just the right amount of light | Great fit, 98/100 |
| June | 7,800 lux | Just the right amount of light | Great fit, 99/100 |
| September | 6,477 lux | Just the right amount of light | Great fit, 98/100 |
| October | 4,924 lux | A little dim, but workable | Worth a try, 67/100 |
| November | 3,648 lux | A little dim, but workable | Worth a try, 65/100 |
| December | 3,250 lux | A little dim, but workable | Worth a try, 64/100 |
The sill holds a great fit from 12 March to 30 September and reads worth a try from 1 October, so by the time this page was written it had been flagged for three weeks. December’s 3,250 lux scores 64, the lowest row. All winter the light column says a little dim, the same flag the distance table puts on a pot 0.7 metres back.
Summer runs the other way. June’s 7,800 lux pushes the great-fit strip out to about a metre; in March and September it’s back to about 55 centimetres. Checked at other latitudes between 30 and 51, the great-fit months started and ended within about a week of these dates, so from roughly Houston to London the equinoxes make a fair rule of thumb.
Winter leaves nowhere better in the room, since every spot behind the sill is dimmer. A grow light is the box’s other fix, and the north window page works out how much light a lamp has to put on the leaves.
Does a croton in an east window need extra humidity?
Only in properly dry air. On the sill from the card the score holds a great fit down to 30% humidity and slips to a good fit at 25%. Below that the air reads too dry and the verdict falls to worth a try. Above 40% there’s almost nothing left to gain. Those are the same verdicts, row for row, as the humidity table on the south window page, so it isn’t repeated here.
Two things shift that advice. In winter the light already holds the sill at worth a try, and in our December run even 20% humidity left it there, so a humidifier buys a few points and no new verdict. The cultivar matters too. Most crotons in our care data score just like the plain species on this sill, but ‘Excellent’ and ‘Norma’ want damper air: at 50% they drop to a good fit, and at 60% they’re back to great.
What’s the best window for a croton?
South, as soon as the pot has to stand anywhere but the sill. On the glass itself the three sunny windows score within a couple of points of each other for this plant. Behind it they separate: a croton keeps its great fit to about a metre at a west window and to just past two metres at a south one, against 60 centimetres here.
Winter keeps the same order. At latitude 40 a south sill holds a great fit all year, a west sill drops out from 20 October to 20 February, and this one from October to mid-March. A north window never gets a croton to a great fit at any distance. If east is the window you’ve got, the sill is the croton’s spot, and the east window guide covers how far back other plants can go at the same glass.
Will your east window match these numbers?
Only if nothing stands in front of it. Every row here assumes bare glass with open sky to the east, and the lux column is worked out from the compass, the tape measure and a clear day, not read off a meter. A tree, a balcony above, the building across the street or a fly screen trims every row, and with only 60 centimetres to give, that trim lands on the croton first. The free spot checker scores your own spot with local weather.
Published October 22, 2026
