Gadenin日本語Get the appBright shade means bright enough to read by
Bright indirect light is the standard advice and it is vague. A usable test: the spot should be bright enough to read a newspaper comfortably without a lamp, and a hand held above the plant should cast a shadow with a soft but definite edge.
- Behind a sheer curtain A south or west window with one layer of sheer curtain diffuses the sun into about the right light. In high summer add a second layer or move the plant three feet back.
- An east window A few hours of soft morning sun is the most forgiving position of all, and usually needs no curtain at all.
- A north window No direct sun, so no risk of scorch, but often short of light. Put it right up against the glass and turn the pot monthly so it does not lean.
Distance from the window changes everything
Light falls off far faster than it looks to the eye, because your eyes adjust. A spot that feels bright three feet into the room can be a fraction of the light at the glass.
| Position | Light | How the plant responds |
|---|---|---|
| Within a foot of the glass, behind sheer | Sufficient | Large leaves with deep splits |
| Three feet from the window | A little short | Holds its own, but new leaves come smaller |
| Ten feet or more | Short | Stretched stems and new leaves that do not split |
| A room with no window | Not viable | Needs a grow light to survive |
White walls and pale floors reflect light and help. Behind furniture or a taller plant, a position at the window can still be dark.
Direct sun scorches quickly
A monstera grows under a canopy in the wild and has no defense against full sun on a window sill. Scorch appears as pale brown dry patches, usually within a day or two of the move that caused it.
- What to do with a scorched leaf If the damage is a patch, leave the leaf on: it still photosynthesises. If more than half the leaf is brown and dry, cut it off at the base of the stalk and let the plant put the energy into new growth.
- Avoid the afternoon sun A west window in summer combines the strongest light with the highest heat, which is the worst combination. Move the plant back into the room for the afternoon or add shading.
Leaves that do not split are short of light
The splits and holes develop as the plant matures, but light is what drives it. A monstera in a dim corner keeps producing small, entire leaves indefinitely, however well you water and feed it.
There is a second factor: monstera is a climber, and leaves get larger and more divided once the plant has something to climb. Give it both more light and something to climb and the change is obvious within a few leaves.
- Move it one step brighter Moving a plant from three feet back to the window can change the very next leaf. Wait for two or three leaves to open before you judge the result.
- Give it something to climb Train the aerial roots onto a moss pole and the leaves enlarge even at the same light level. Climbing is part of how the plant matures.
Move it for summer and winter
The same position is not right all year, because the sun's angle and intensity change. Two moves a year are usually enough.
| Season | Where | Why |
|---|---|---|
| Spring | At the window behind sheer curtain | Growing season, using the most light |
| Summer | Three feet back, or a north aspect | Heat and strong light together cause scorch |
| Autumn | Back to the window | The sun weakens and the old spot is now too dark |
| Winter | At the window by day, into the room at night | Avoid the cold at the glass overnight |
A leaf touching cold window glass in winter blackens where it touches. Moving the plant back at night alone prevents it.
Putting it outside
A monstera does well outdoors in summer shade, but the transition has to be gradual or you will scorch every leaf in a day.
- Choose the timing Only once nights are reliably above 59F (15C), and bring it back in before nights fall below that in autumn.
- Start in shade Begin under a porch or in the shade of a tree and increase the light over two weeks. Skipping this step scorches the leaves, without exception.
- Watch rain and wind Prolonged rain keeps the pot wet and the roots rot. Strong wind splits the large leaves lengthways, so bring it in before bad weather.
Before bringing it back inside, wash the leaf undersides and the bottom of the pot so you do not bring slugs and pests in with it.
When the room is simply too dark
A plant in low light also uses much less water. When you move it somewhere darker, stretch the watering interval at the same time or you will rot the roots.
- Use a grow light In a room with no window, a grow light twelve to twenty inches (30 to 50 cm) above the plant for ten to twelve hours a day. Ordinary room lighting is nowhere near enough.
- Rotate it with another plant If you want it in a dark spot, swap it with a plant at a bright window every fortnight. That keeps the leaf size and number far better than leaving one plant in the dark.
- Reduce the number of leaves In poor light, remove damaged lower leaves so the remaining ones get the resources. Aim to hold the plant's shape rather than to grow it.