When monstera leaves start turning yellow, most people do the same thing. They move the plant closer to the window.
Sometimes that helps. More often, it doesn't. The leaves keep yellowing, maybe more slowly, maybe not. A few weeks later, another leaf goes. And the plant never really bounces back.
That's because most yellow monstera leaves have nothing to do with light. They're a root problem.
Why People Blame Light First
Light is the easiest thing to change and the easiest thing to blame. If a plant looks unhappy, moving it to a brighter spot feels like a reasonable response.
And it's not wrong that monsteras need decent light. They do. But a monstera that's been sitting in the same spot for months and suddenly starts yellowing hasn't suddenly decided it needs more sun. Something changed underground.
The most common cause of yellow leaves in a monstera that used to be fine is the root system starting to struggle. And the root system struggles when the soil around it stays wet for too long.
The Connection Between Wet Soil and Yellow Leaves
When roots sit in waterlogged soil, they start to suffocate. They can't get the oxygen they need to function properly.
Roots that are stressed or dying can't move water and nutrients up into the plant. The leaves are the last stop, so they're the first place you see the problem. The plant pulls resources away from older leaves first, which is why yellowing usually starts on the lower, older leaves and works its way up.
By the time a leaf turns fully yellow, the root problem has often been building for weeks.
How to Check the Roots
You don't have to guess. Pull the plant out of its pot and have a look.
Healthy roots are firm and white or pale tan. They should feel solid when you press them gently. Stressed or rotten roots are soft, brown, and sometimes slimy. They fall apart when you handle them.
If your roots look healthy, then yes, light or nutrition might be worth investigating.
But if you see brown, soft roots, you've found your problem. And the fix isn't a sunnier windowsill.
The Soil Is Usually the Cause
Standard potting mix is designed to hold moisture. That's useful for lots of plants, but monsteras come from tropical forests where their roots grow around rocks and tree bark, not in heavy garden soil. They're used to fast drainage and plenty of air around their roots.
When a monstera sits in regular potting mix for a year or two, a few things happen. The mix compacts. The small particles settle together. What used to drain reasonably well now holds water like a sponge. And the roots that were doing fine in fresh soil start to struggle as the mix tightens around them.
You didn't do anything wrong. The soil just got old.
What Healthy Roots Look Like Versus Unhealthy Ones
It helps to know what you're looking at when you unpot your plant.
Healthy roots: Firm, white or light tan, spread out through the soil, slightly spongy when pressed but springy.
Overwatered/stressed roots: Light brown, soft, possibly wet-looking. Not yet rotten, but struggling.
Rotten roots: Dark brown or black, mushy, fall apart when touched, may smell sour or bad.
If you've got overwatered but not yet rotten roots, you have good timing. You can fix this without major intervention.
If you've got rotten roots, you'll need to cut them back and repot into something that drains better.
How to Fix It
Trim off any brown, soft roots with clean scissors. Healthy root tissue that's light brown or slightly soft can stay. Only remove roots that are clearly dead.
Then repot into a mix that drains quickly. The goal is a mix where water runs out easily and the mix dries out within a couple of days rather than staying wet all week.
Adding chunky bark pieces to your potting mix opens it up significantly. The bark creates small gaps that let water drain through and air circulate around the roots. This is much closer to the conditions a monstera's roots actually want.
Orchiata orchid bark is worth trying here. It's made from aged New Zealand pine bark and stays chunky for years, so it doesn't compress back down into the mix the way cheaper materials do. Mix it through your regular potting mix at roughly half and half, or use it on its own for a plant that's been really struggling.
For most monsteras, the Classic grade (6 to 9mm) or Power grade (9 to 12mm) from Orchiata's range works well. The pieces are big enough to create proper air gaps but not so large that the roots can't grip anything.
What Happens After You Repot
The yellowing should slow down and stop. You might lose a leaf or two that were already on their way out before you fixed the problem. That's normal.
New growth should look healthy. Firm, green, properly sized leaves coming through over the following weeks is a good sign the roots are recovering.
Don't move the plant to a sunnier spot at the same time as repotting. Give it a few weeks to settle first. And hold off on fertilising for a month so the freshly trimmed roots don't get burned.
Other Causes of Yellow Leaves
Just to be thorough: if you unpot the plant and the roots genuinely look healthy and white, here are the other things to check.
Too much direct sun. Monstera leaves can go pale yellow and almost bleached if they're getting harsh direct sun, especially in summer. The yellowing tends to be on leaves facing the light source and happens quickly.
Underwatering. Leaves that go yellow and then crispy from the tips inward, with soil that's bone dry, can indicate the plant needs more water. This is much less common than overwatering.
Very old soil. Even without root rot, potting mix that's been in the pot for two or three years has often lost most of its nutrients. A slow yellowing across older leaves, with roots that look fine, might just need a repot into fresh mix.
But check the roots first. In most cases, that's where the answer is.
The fastest way to get a monstera producing healthy green leaves again is to give its roots a proper environment to work in. Better drainage, more air movement in the mix, and bark that holds its structure over time. The leaves follow the roots. Fix the roots, and the leaves sort themselves out.
