Judge Your Light First
Stand near the window around midday and hold your hand about a foot above where the plant will sit. A crisp, dark shadow means decent light even if the room feels dim. A soft, blurry shadow means low to medium light. A faint or no shadow means very low light.
Several things change how much light a spot gets. In the Northern Hemisphere a north-facing window gets no direct sun but can still give steady brightness, and in the Southern Hemisphere it is the other way around. A window facing an air shaft or a brick wall can be dimmer than its direction suggests. Light also drops quickly with distance: a plant six feet (about 2 m) from the glass gets far less than one on the sill.
| What you see | Roughly what it means | What it suits |
|---|---|---|
| A crisp shadow, plant on or near the sill | Brighter than low light | The plants below, and many others |
| A soft, blurry shadow a few feet from the window | Low to medium light | The five plants below |
| A very faint or no shadow, well back from a small window | Very low light | Only the toughest plants, growing slowly. Consider a grow light |
| No window at all | Not enough natural light | A grow light. Most plants will not last long on ordinary room lighting |
For reference, a common baseline for "low light" in horticulture is about 100 footcandles. A light meter app can give a rough number, but the shadow test is usually enough to choose a plant.
A dim room can still give usable light. Your eyes adjust to darkness, so trust the shadow test or a light meter over how bright the room feels.
Where to Put a Plant
Placement often matters more than which plant you choose. Moving a plant a few feet closer to the window can help more than switching species, so use a shelf, stool or sill near the glass instead of the far side of the room.
Match the plant to the spot
- A shelf or table a few feet from a window: pothos or peace lily
- A corner further back that still gets some daylight: ZZ plant, snake plant or cast iron plant
- A hallway or bathroom with a small window or open doorway: snake plant or ZZ plant, as long as the spot gets some daylight
Five Plants for Dim Corners
None of these grow in darkness. All need some daylight, even if it is faint, and all grow slowly in low light.
| Plant | Best spot | Watch out for | Pets |
|---|---|---|---|
| Snake plant | Hallway or dim corner with borrowed light | Overwatering. It stores water in its leaves | Toxic if chewed |
| ZZ plant | Corner away from the window with some daylight | Very slow growth in low light | Toxic if chewed |
| Pothos | Shelf a few feet from a shaded window | Leggy, sparse growth if light is too low | Toxic if chewed |
| Cast iron plant | Rental with one small window | Extremely slow growth | Listed as non-toxic |
| Peace lily | Low to medium light, a few feet from the window | May flower less in dim rooms. Droops when thirsty | Toxic if chewed |
Pet information follows the ASPCA toxic and non-toxic plant lists. Check them if your animals chew plants. Darker-leaved varieties of a species generally cope with low light better than lighter or variegated ones, so choose the darker form where there is a choice.
When a Spot Is Too Dark
Even tough plants need some light. A windowless hallway or closet, a spot behind a heavy curtain, or a corner where the shadow test shows almost nothing is too dark for most plants long term.
If that is the only spot you have, a small grow light is a better plan than a tougher plant. Moving the plant closer to a window is the other simple fix.
Watering Matters Most in Dim Rooms
Less light means slower growth, so the soil stays wet longer, and soggy roots are a common route to rot in dim rooms. Skip the calendar and push a finger two inches (about 5 cm) into the soil before you water. If it still feels cool or damp, wait.
Plants in low light also need less feeding. Fertilizing a plant that is barely growing mostly builds up salts in the soil.
Sources
Where to Start
This week, do the shadow test at the spot where you want a plant and match it to the closest row in the table above. That tells you which plants to try and how close to the window to put them.
Give a plant a full season before deciding it does not belong. Low light growth is slow by design, not a sign you are doing it wrong. The healthiest plants in an apartment are often not in the brightest rooms. They are the ones chosen to suit the room.
Ready to choose? Try the shadow test at your favorite spot this weekend.
