Why Are The Jalapenos Turning Black

Jalapenos turn black due to a few common culprits, most often blossom end rot, sunscald, or a natural color change as they mature.
 
Seeing those dark patches can be alarming, but it’s rarely a death sentence for your plant.
 
Understanding exactly why your jalapenos are turning black is the first step to fixing the issue and saving your harvest.
 
In this post, we’ll dig deep into the reasons behind black jalapenos, how to tell the difference between a problem and a natural stage, and what you can do about it.
 
Let’s get those peppers back to perfect green or red, whichever you prefer.
 
 

Why Are Jalapenos Turning Black On The Plant?

The most frequent reason jalapenos turn black is blossom end rot, which is a calcium deficiency that affects the developing fruit.
 
This isn’t a disease or a pest, it’s a physiological disorder that happens when the plant can’t move enough calcium to the pepper’s growing tip.
 
When your jalapenos are turning black from blossom end rot, you’ll typically see a dark, sunken, leathery patch at the bottom tip of the pepper.
 
Another huge reason jalapenos turn black is sunscald, which appears as pale or blackened, papery areas on the side of the pepper that faces the sun.
 
Let’s explore each cause in detail so you can pinpoint exactly what’s happening with your own plants.
 

1. Blossom End Rot Causes Black Jalapenos

Blossom end rot is the #1 reason jalapenos turn black, and it always starts at the flower end, the tip opposite the stem.
 
The blackening is actually dead tissue that results from a lack of calcium in the developing fruit.
 
Even if your soil has plenty of calcium, inconsistent watering can prevent the roots from uptaking it properly.
 
When the plant experiences dry spells followed by heavy watering, calcium transport gets interrupted, and that’s when you see those black jalapenos forming.
 
The fix is to water consistently, mulch around the base to retain moisture, and consider a foliar calcium spray for immediate relief.
 

2. Sunscald Makes Jalapenos Turn Black

Sunscald is another common reason jalapenos turn black, especially during intense summer heat waves.
 
If you’ve recently pruned away too many leaves, the peppers become exposed to direct, harsh sunlight for hours.
 
The pepper’s skin gets damaged, and that damage shows up as a white or black, sunken, and glossy patch.
 
Unlike blossom end rot, sunscald usually appears on the side of the pepper that faces the sun, not the tip.
 
To prevent sunscald, keep some leaf cover over your fruit, and avoid heavy pruning during the hottest months.
 

3. Natural Color Transition Turns Jalapenos Black

Not all black jalapenos are a bad sign, sometimes it’s just a natural color transition.
 
Jalapenos start green, then they may pass through a dark, almost black-purple stage before turning red when fully mature.
 
This happens with many jalapeno varieties, especially those with a genetic tendency toward dark pigmentation.
 
If your jalapenos are turning black but feel firm, look healthy, and are simply maturing, just wait a few more days.
 
They might turn a deep red, or they might stay dark green-black and be perfectly edible as they are.
 

4. Anthracnose or Fungal Infections

Fungal diseases like anthracnose can also cause jalapenos to turn black, but this is less common on the fruit itself.
 
You’ll typically see dark, sunken lesions that may have pink or orange spore masses in the center under humid conditions.
 
This is a more serious issue, and it requires removing affected peppers and improving air circulation around your plants.
 
If you suspect a fungal infection, avoid overhead watering and apply a copper-based fungicide according to label instructions.
 
 

Are Black Jalapenos Safe To Eat?

Yes, black jalapenos are generally safe to eat, but it depends on the cause of the blackening.
 
If the blackening is from a natural color stage or just sunscald, you can absolutely eat them after cutting away any damaged areas.
 
Blossom end rot is also safe, just trim off the black, sunken portion and the rest of the pepper is perfectly fine.
 
However, if the blackness is soft, mushy, or smells rotten, that’s a sign of decay, and you should toss those jalapenos.
 
When jalapenos are turning black due to fungus, it’s better to compost them rather than risk eating moldy tissue.
 
Use your judgement, if the pepper is firm and only has a small black spot, you’re good to go.
 

What Do Black Spots Inside Jalapenos Mean?

Sometimes you cut open a jalapeno and see black spots inside, which is different from the outside turning black.
 
Internal black spots are usually caused by a condition called “internal blackening,” which often stems from boron deficiency or stress.
 
These spots don’t make the jalapeno unsafe, but they might have a slightly bitter taste.
 
You can just scoop them out with a knife and use the rest of the pepper in your cooking.
 
 

How To Fix Jalapenos Turning Black From Blossom End Rot

If you’ve confirmed blossom end rot is why your jalapenos are turning black, here’s a step-by-step plan to turn things around.
 
The good news is that blossom end rot is often temporary, and new peppers can grow perfectly healthy.
 
First, pick off the affected jalapenos so the plant focuses energy on new growth instead of the damaged fruit.
 
Next, test your soil pH, it should be between 6.0 and 6.8 for optimal calcium uptake.
 
Then, water deeply and consistently, aiming for about 1-2 inches per week rather than frequent shallow waterings.
 
Apply a mulch of straw or wood chips to keep soil moisture even and reduce evaporation between waterings.
 
Finally, you can mix a calcium solution (like calcium nitrate or liquid calcium) and spray it directly on the foliage.
 
This bypasses the roots and delivers calcium straight to the leaves, helping new fruit develop without that black rot.
 

Preventing Black Jalapenos With Proper Watering

The absolute best way to prevent jalapenos from turning black due to calcium issues is to master your watering routine.
 
Inconsistent moisture is the stealthy killer that causes the plant to shut down calcium transport.
 
Use a drip irrigation system or a soaker hose to deliver slow, steady water right to the root zone.
 
Water early in the morning so the foliage dries quickly, which also prevents fungal diseases.
 
And never let the soil completely dry out, jalapenos hate drought stress just as much as they hate soggy roots.
 
With even moisture, your plant can move calcium efficiently, and you won’t see those black jalapenos appearing.
 
 

So, Why Are The Jalapenos Turning Black?

Jalapenos turn black because of blossom end rot, sunscald, a natural change in color as they ripen, or less often, a fungal infection.
 
Blossom end rot and sunscald are the two most common causes, and both are directly tied to watering and plant stress.
 
You can fix both issues by watering consistently, mulching, and providing some shade during intense heat.
 
Healthy, unblemished jalapenos are usually safe to eat even if they show some black patches, just trim them off.
 
If you see black spots on the new peppers after fixing your watering, it’s likely just a natural color stage.
 
So don’t panic, grab your watering can, and keep an eye on those beautiful green pods.