Why Are My Plant’s Leaves Turning Brown or Crispy?
Why Are My Plant’s Leaves Turning Brown or Crispy?
This is something we talk about quite a bit during my Lives. Somebody will ask why their plant has brown tips or crispy edges, and one of the first things I want to know is what the rest of the plant looks like.
Are we talking about one older leaf? Are several leaves developing brown edges? Or is the browning showing up on the new leaves?
Something I remind people of all the time is that our plants are constantly communicating with us. They’re responding to what’s happening in their environment, and we can see those responses in their leaves, their roots, and how they’re growing.
When a leaf develops a brown tip, it’s showing us something the plant has experienced or may still be experiencing. It doesn’t tell us the exact cause, so that’s where we start looking at the growing conditions and using a little process of elimination.
And that’s what I want people to become comfortable doing. Learning how to read what their plants are showing them.
Let’s Look at How You’re Watering
When we’re talking about crispy leaf tips, I want to know how long your soil is taking to dry.
Maybe you’ve got a plant that’s drying out in two or three days, and you’re finding it completely dry every time you check it. That plant could be going longer without water than its roots can comfortably support.
Now let’s look at another situation. Your plant is taking fourteen days to dry out, the soil is staying wet, and you’re seeing brown edges developing.
In that situation, I’m going to be curious about the roots, the size of the pot, and how much light the plant is receiving.
If the roots have been sitting in soil that stays too wet for too long, they may begin having trouble taking up the water the leaves need. And yes, that can eventually contribute to crispy foliage, even though there’s moisture in the pot.
For many of my tropical plants at Rooted, I generally like to see the soil moving through its moisture in approximately seven days. That’s something I use when evaluating how the plant is growing, while keeping its individual watering needs in mind.
Remember, water when YOUR plant needs watered.
Take a Look at Your Lighting
Another thing I want you to consider is whether the plant has recently been moved or had its lighting changed.
Let’s say you’ve had a plant growing a few feet away from a window, and you move it directly into strong sunlight. Those leaves may suddenly be receiving considerably more light than they’re accustomed to.
Sometimes we’ll see pale or bleached patches that eventually turn brown. The same thing can happen when plant lights are positioned too close or the intensity is too high for that particular plant.
I grow entirely under plant lights at Rooted, so I’m always paying attention to the distance between my fixtures and the leaves. At home, I use both windows and supplemental lighting.
If you’re seeing browning on the leaves closest to your light source, take a look at how much light they’re actually receiving.
As you make adjustments, give the plant an opportunity to acclimate and pay attention to how its new leaves develop.
What About Humidity and Airflow?
I know humidity comes up quite a bit when we’re talking about brown tips, especially with plants that have thinner, more delicate foliage.
But I also want to know where your plant is sitting.
Maybe you’ve got it right beside a heating vent, and during the winter there’s warm, dry air blowing across those leaves. Or maybe it’s sitting against a cold window.
Those conditions can influence how much water the leaves lose and how well the plant maintains its foliage.
At Rooted, I generally keep my humidity around sixty percent. I also pay attention to airflow because I want the air moving around my plants.
Airflow is important around the pots, too. If your soil is staying consistently moist and there’s very little air movement, you may begin seeing fungal growth on the surface.
That’s another reason I like looking at the entire growing environment instead of making a decision based on one brown tip.
What’s That White Stuff on Your Soil?
Sometimes when we’re talking about brown tips, somebody will mention that they’ve also noticed white material on top of their soil.
There are a couple of things I want you to look for.
Minerals from your water and fertilizer can accumulate in the soil over time. That buildup may look white and crusty, and when concentrations become too high, those salts can interfere with how the roots take up water.
But you can also have mold growing on the soil surface. That usually has a softer, fuzzy appearance and can develop when the soil remains moist and there’s limited airflow.
Those are two different situations, so take a closer look at what you’re actually seeing.
If you’re finding mineral buildup, I’d want to know about your water source, fertilizer routine, and how you’re watering. If you’re seeing mold, I’d look at how long the soil is staying wet and whether there’s enough airflow around the pot.
Either way, it gives us more information about the conditions surrounding those roots.
What If It’s a Variegated Plant?
This is something I wanted to mention because I get quite a few questions about white variegation turning brown.
Those beautiful white portions of a leaf have very little or no chlorophyll, so they contribute much less to photosynthesis than the green portions. They can also be more vulnerable when the plant is experiencing changes in its growing conditions.
Light, watering, and root health all play a part in how well the plant maintains those leaves.
I actually have a separate article explaining the science behind why white variegation browns and what you can look at in your growing environment.
Why Do White Variegated Leaves Turn Brown?
How Do You Figure Out What Your Plant Is Telling You?
This is where I really want people to get comfortable using process of elimination.
Let’s say you’ve got a plant with brown tips. We know the leaves are showing us that something has affected the plant, but there are several possible explanations.
So let’s start looking.
How long is the soil taking to dry? Has the plant recently been moved? Is it sitting near a heating vent? Has something changed with the lighting? Are the roots healthy?
As you look at those things, you can begin narrowing down what may have contributed to the damage.
Maybe you’ve discovered that your plant has been taking fourteen days to dry out, and after evaluating your lighting, you’ve moved it closer to an appropriate window. Over the next few watering cycles, you notice the soil is drying more consistently.
That’s information you can use.
Now we want to see how the plant responds as it continues growing. Because the older leaves are going to keep those brown areas, even after you’ve made improvements.
And that brings me to something I tell people during my Lives all the time.
Your New Leaves Will Help You Measure Your Progress
When you’ve made adjustments to your plant’s growing environment, I want you to watch the new leaves.
Let’s say your plant had been developing crispy edges, and you’ve worked through the possible causes. You’ve changed the lighting or adjusted how you’re watering, and now you’ve got a beautiful new leaf beginning to emerge.
Look at how that leaf develops.
Is it coming in without those same brown tips? Are the next few leaves looking healthy? Is your plant continuing to grow?
If those new leaves are developing without the damage you were seeing before, that’s a good indication that the changes you’ve made are helping.
And this is why I like people to pay attention to their plants over time. Some problems take a while to show up, and some changes take a while to improve. Watching several new leaves gives you a better picture of how the plant is responding.
The older leaves tell us something about what the plant has been through. The newer leaves help us understand how it’s responding to the environment we’re providing now.
Should You Cut Off Those Brown or Yellow Leaves?
People ask me this during my Lives all the time. They’ll have a leaf with a brown tip or some yellowing along the edge, and they want to cut it off because it doesn’t look as pretty anymore.
And I tell them, keep that leaf!
As long as there’s healthy green tissue on it and we’re not dealing with something that needs to be removed, that leaf can continue contributing to the plant.
But there’s another reason I like people to keep those imperfect leaves.
They’re a record of what your plant has been through.
Maybe when you first brought that plant home, the lighting wasn’t quite where it needed to be. Maybe you were still figuring out how quickly it used water. Those leaves developed some brown tips along the way.
Now you’ve learned a little more about that plant. You’ve made some adjustments, and look at the beautiful new leaves it’s producing.
You can see the difference right there.
Those older leaves are showing you something about the conditions your plant experienced, and the newer leaves are giving you information about how it’s growing today.
Eventually, as your plant continues growing, those older leaves will naturally age and fall away. And who knows, a year or two down the road you might be looking at this beautiful plant full of healthy green leaves, and those brown tips that bothered you so much won’t even be there anymore.
That’s why I encourage people to keep those leaves when they’re still healthy enough to contribute to the plant. They give you something to look back at while you’re learning how your plant grows.
Your Plants Are Always Giving You Information
Something I wish more people understood is how responsive plants are to the world around them.
They respond to light, water, temperature, touch, and changes in their environment. Some of those responses happen inside the plant where we can’t see them, while others eventually become visible through the foliage, roots, or new growth.
And that’s where learning to read those signals comes in.
A brown tip tells us that part of the leaf has experienced damage. A yellowing leaf tells us something is changing in that tissue. A new leaf that’s developing beautifully gives us information about how the plant is growing now.
Each one is a clue.
By paying attention to those changes and looking at the conditions surrounding the plant, we can begin understanding what may have happened and what adjustments could help.
And as you become more familiar with your plants, that process starts becoming more natural. You recognize their normal growth, notice when something changes, and have a better idea of what to look at.
That’s really what I want people to learn. Your plants are showing you things all the time. We just have to learn how to read those signals.
Keep Learning With Rooted
This is why I wrote They Are Talking to You: Signs & Signals.
I wanted people to understand the relationship between what they’re seeing on their plants and what’s happening in the growing environment. We go deeper into yellow leaves, browning, curling, drooping, root health, watering, lighting, and the different changes plants experience as they grow.
The more you understand those signals, the more comfortable you’ll become looking at your own plants, working through the possibilities, and recognizing what their new growth is showing you.
