Have you ever stood in the greenhouse, happily admiring your green chilli pods, and suddenly discovered that the end of the pod is… brown, sunken and looks as if someone has put a curse on it?
Congratulations – you have just come across blossom-end rot. And you are far from alone.
In this article we sort out what blossom-end rot is, why it occurs, how you can prevent it – and what you can actually do when the damage is already done. It is easier than you think to get on top of it, as long as you understand the mechanisms behind it.
So roll up your sleeves, take a deep breath and let’s solve this together.
What is blossom-end rot?
Blossom-end rot is not a disease in itself – but a physiological problem, which means it is about the plant’s internal functioning rather than any infection.
It is thus not a fungus, bacterium or pest – but usually a deficiency or imbalance in the calcium supply.
Typical signs:
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A brown, watery or sunken patch at the end of the chilli pod (where the flower was)
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Sometimes it can look a little dry and paper-thick
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The pod rots from the tip upwards
And yes – it looks really sad. But there is something you can do about it.
Why do I get blossom-end rot on chilli?
Here comes the big question: why does blossom-end rot occur on my chilli pods?
The short version:
The pod doesn’t get enough calcium while it is forming.
The slightly longer version:
Even though there is often calcium in the compost, the plant can have difficulty transporting it to where it is needed, that is, to the young pod.
And this is where it gets interesting – because it isn’t always about nutrition itself, but about the balance between:
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Calcium
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Watering
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Temperature
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Growth rate
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And how stressed the plant is
Common causes of blossom-end rot
Here are the most common culprits in the drama:
🟠 Uneven watering
Perhaps the biggest culprit of them all. Too wet → the roots get oxygen starvation. Too dry → the plant cannot take up calcium.
🟠 Rapid growth after heavy feeding
If you ‘boost’ the plant with a lot of nitrogen or tomato feed it can start to grow too fast – and the pod doesn’t get its share of the calcium.
🟠 High temperatures during fruit set
Warm weather increases the growth rate but often makes calcium uptake more difficult.
🟠 Wrong pH in the compost
Too acidic or too alkaline can lock nutrients in the compost so they are not taken up by the roots.
🟠 Compacted compost or poor root development
Calcium is taken up via the roots, so if the roots aren’t doing well – the fruit won’t either.
Blossom-end rot on chilli – especially common on certain varieties?
Yes! It has actually been shown that some varieties are more sensitive than others. In my own growing I have noticed that Capsicum annuum –
that is, varieties such as Jalapeño, Pimiento de Padrón, Hot Apple and similar – are somewhat more prone to blossom-end rot than, for example, chinense varieties such as Habanero or baccatum types such as Aji Lemon.
It isn’t set in stone, but something worth keeping an eye on.
Can blossom-end rot infect other pods?
No! And this is important to remember:
Blossom-end rot is not contagious.
You can leave the healthy pods on – but remove the affected ones, as they only take energy from the plant unnecessarily.
What can I do about it?
If you already have blossom-end rot – don’t despair. Here is what you can do:
1. Remove affected pods
They won’t recover. But if you remove them the plant has more energy for the healthy pods.
2. Review your watering
Water evenly, preferably a little every day rather than lots every third day. The compost should be evenly moist – never soaking wet, never bone dry.
3. Reduce nitrogen, increase calcium
If you feed a lot – pause a little. Try adding calcium (e.g. lime or a dose of bone meal).
4. Use better compost and a bigger pot
Poor drainage, a small pot and compacted compost are a bad combo. Give the plant air and space.
Blossom-end rot on tomato – same problem, different plant
Perhaps you recognise the symptoms from tomato growing? Yes indeed – blossom-end rot on tomatoes is exactly the same phenomenon. In fact tomato and chilli are just as prone to similar problems under stress.
So if you have previously struggled with blossom-end rot on tomatoes – see this as a heads-up before your chilli growing.
Prevent blossom-end rot – do this from the start
Here are some tricks to reduce the risk right from the beginning:
✅ Use airy and well-drained compost
✅ Water regularly and in a controlled way
✅ Avoid stressing the plant with overfeeding
✅ Add calcium preventively – e.g. via bone meal
✅ Grow in sufficiently large pots (preferably 10 litres or more)
And yes – this is when you should look out for…
How to grow chilli
Want to keep track of the whole growing journey – from seed to pod? Read our big guide: How to grow chilli. There you find everything you need about compost, feed, light and watering.
Björn’s tips against blossom-end rot
I have had my fair share of rot sorrow. But here is what has made the biggest difference for me:
🌶 When I pot on my chilli plants into the final pot I always use what I call Björn’s special mix:
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A half handful of pelleted chicken manure
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A few tablespoons of bone meal (for calcium – long-acting!)
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A few tablespoons of Epsom salt (for magnesium, which helps with calcium uptake)
This gives a stable base when the plant is going to form fruit – and since I started doing this I have hardly seen blossom-end rot on my annuum varieties at all.
Blossom-end rot on chilli? We’ll fix it
🔍 What is blossom-end rot? A calcium-related growth disorder, not a disease.
🥵 Why does it occur? Usually because of uneven watering or a stressed plant.
🌶 Which are most affected? Capsicum annuum varieties are extra sensitive.
🔧 What can I do? Remove affected pods, water evenly, add bone meal.
🛡 How do I prevent it? An even growing environment, the right feed and… Björn’s special mix!
Want more growing tips, problem guides and nerdery?
Have a look around the chilli blog – there is plenty of inspiration for anyone who wants to succeed with chilli growing (and avoid sad, brown pods).
🌱 Good luck – and remember: with a little understanding and the right tricks, blossom-end rot is just a bump on the road to a fantastic harvest.
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