On a west sill a ZZ plant scores 68 out of 100 at 22 °C and 50% humidity, because the 7,800 lux there reads a bit bright for it. One metre back the estimate falls to 6,000 lux and the score rises to 97, and from there to four metres it reads 97 to 99. That holds from September to March. From April to August the bright strip reaches past the metre.
Read on 14 October 2026, the top results run from the sill to the far wall. Soltech says to find a spot near a west or east window, and owners asking on Reddit and in a Facebook group about a ZZ by west or southwest glass are told it’s fine there. Joy Us Garden says to keep it out of west windows, or six feet away at least. Low Light Leaf gives four to six feet back in its text and three to four in its own table.
Low Light Leaf’s two ranges both hold up, in different months. The same page even says why: a spot that’s safe in spring can be in “scorching” sun by midsummer.
Worth a try
It can work here with a little care.
A bit bright, but workable
Comfortable temperature
Humidity suits it
Airflow suits it
Can a ZZ plant sit on a west windowsill?
First, the published numbers. Each row is a figure someone prints for a ZZ plant’s light, in that source’s own unit:
| Who publishes it | What it says a ZZ plant needs | What the figure is |
|---|---|---|
| theplantrunner.com | 300–800 lux | True low-light crew (ZZ, snake plant, cast-iron plant, some ferns) |
| growlightmeter.com | 5 – 10 PPFD / DLI | ZZ Plant |
| houseplantjournal.com | 100 FC (20 µmol) foot-candles | minimum indirect light level |
| houseplantjournal.com | 200 FC (40 µmol) foot-candles | good indirect light level |
| houseplantsnook.com | 50–100 foot-candles | chart fc level |
It can, and it will live there. The card above gives the sill 68, worth a try, and light is the only thing it marks: a bit bright, but workable. The other three dimensions sit inside their bands.
Every figure in that table is about how much light a ZZ needs, and none is labelled as the most it should get. The engine does set a top, and it falls between two rows of the distance table further down: 6,000 lux reads just right, 6,284 a bit bright. A clear-day west sill, at 7,800, is over it.
From November to January at latitude 40 the sill itself reads a great fit, while north glass is where the sill suits a ZZ without waiting for winter. If yours comes up to the glass for those months, leave a thermometer on the sill overnight first. A ZZ’s floor is 16 °C, the highest of the four plants the cold-draft lists keep naming.
How far from a west window should a ZZ plant be?
About a metre, on a clear day in spring or autumn. Here is the same plant moved back from the glass, in short steps where the line falls and one long step after:
| Distance from the glass | Estimated light | What the light is doing | Verdict |
|---|---|---|---|
| 0.3 m, against the glass | 7,800 lux | A bit bright, but workable | Worth a try, 68/100 |
| 0.6 m back | 7,218 lux | A bit bright, but workable | Worth a try, 68/100 |
| 0.9 m back | 6,284 lux | A bit bright, but workable | Worth a try, 68/100 |
| 1 m back | 6,000 lux | Just the right amount of light | Great fit, 97/100 |
| 1.5 m back | 4,762 lux | Just the right amount of light | Great fit, 99/100 |
| 4 m back | 1,500 lux | Just the right amount of light | Great fit, 99/100 |
The light stays on the bright side through the 0.9 m row, at 6,284 lux, and has crossed by one metre, where it reads 6,000 and the score is 97. Three feet is 0.91 m. So the three-to-four-feet range starts a few centimetres short of the line and ends well past it.
Two feet, the 0.6 m row, is still flagged here. On an east window two feet is roughly where a ZZ comes clear, because that sill starts dimmer. A snake plant at this same west glass clears by the same metre.
The far end never turns. Four metres, about thirteen feet, still reads 99, so nothing on the light side argues for keeping a ZZ out of a west room, and six feet back is safe without being needed. The lux figures are estimates from window direction, distance and a clear day, not meter readings, and with no season in them they sit close to the next table’s March and September.
Does a ZZ plant need to sit further back in summer?
By about half a metre. Here is the one-metre spot from that table, scored on the 21st of eight months at latitude 40 degrees, roughly the latitude of New York or Beijing:
| The month it is | Estimated light | What the light is doing | Verdict |
|---|---|---|---|
| March | 5,964 lux | Just the right amount of light | Great fit, 97/100 |
| April | 6,888 lux | A bit bright, but workable | Worth a try, 68/100 |
| May | 7,200 lux | A bit bright, but workable | Worth a try, 68/100 |
| June | 7,200 lux | A bit bright, but workable | Worth a try, 68/100 |
| July | 7,200 lux | A bit bright, but workable | Worth a try, 68/100 |
| August | 6,900 lux | A bit bright, but workable | Worth a try, 68/100 |
| September | 5,982 lux | Just the right amount of light | Great fit, 97/100 |
| December | 3,501 lux | Just the right amount of light | Great fit, 99/100 |
March reads 97 at 5,964 lux. A month later the estimate is 6,888 and the score 68, and it stays at 68 through June’s 7,200 until September brings 5,982 lux and 97 again. That’s Low Light Leaf’s spring-to-midsummer warning in numbers, though the engine’s word for it is milder than scorching: a bit bright, but workable.
In June the line sits between 1.3 and 1.4 m, about four and a half feet, inside the four-to-six range. In March and September it sits just past three feet, inside three to four. Each of Low Light Leaf’s answers is right for its half of the year. If you’d rather not move the pot twice a year, one and a half metres reads a great fit in every month we scored.
A fiddle leaf fig a metre from the same glass runs the opposite calendar. That metre is a great fit for it only from April to August, the months it reads a bit bright for a ZZ.
Does afternoon heat matter for a ZZ plant in a west window?
It can, and distance alone doesn’t fix it. Every table here holds the air at 22 °C. Score the one-metre spot at 28 °C and it’s still a great fit; at 29 °C it drops to worth a try, with the light fine and the warmth flagged. Two metres and four metres drop the same way at 29 °C.
West rooms get there more often than most, since the sun arrives after the house has spent the day warming up. Moving the pot back takes a ZZ out of the bright strip, and out of the heat only if the air further in is cooler. A thermometer on the sill and another a metre in, read on a sunny July afternoon, will settle it. A monstera at the same glass is marked down on the sill for warmth alone, since the light there suits it.
Is bright, indirect light right for a ZZ plant?
Mostly, but the phrase can’t place the line. Low Light Leaf and Soltech both describe the spot they want as some version of bright and indirect, and the app’s light meter gives that label to anything from 2,500 lux up to just under 10,000. Both sides of the ZZ’s line fall inside it. The 7,800 sill and the 4,762 at one and a half metres get the same two words.
A label that wide can’t say which side of the line a spot is on. The number above it can, and taken at the pot it also counts whatever your window has that these tables leave out.
Will a sheer curtain do the same job as distance?
It can, if it takes enough off. Low Light Leaf and Hey Rooted both offer a sheer as the alternative to distance. On a clear spring or autumn day the sill reads 7,800 lux against a line near 6,000, so the curtain has to cut close to a quarter of the light to match a metre of floor, and summer asks more. Curtains aren’t an input here, and nor is anything outside the glass. A meter reading at the sill with the sheer drawn is the quick way to know.
The west window guide sets out what the afternoon sun does to a room and which plants want it. For the window you actually have, the free spot checker scores the spot with your own weather.
Published October 14, 2026
