Chilli Plant Flower Drop
One of the questions we get asked a lot is why do the flowers keep dropping off my chilli plants without any fruit (chillies) forming?
Flower drop (known to some as “blossom drop”) is a relatively common problem faced not only by chilli growers but by gardeners growing all kinds of fruit and vegetables. It happens when your plant flowers then each flower falls off without any fruit forming. There are a few possible causes and suggested remedies outlined below.
Causes of Chilli Flower Drop and How to Fix Them
1. Lack of pollination
This is perhaps the most common cause of flower drop and is particularly prevalent when plants are grown inside or in a greenhouse. In these environments there is often a lack of flies, bees or butterflies to pollinate the plants. A simple and free solution is to do this manually by performing the pollination yourself.
To pollinate plants by hand simply get a cotton bud or fine paint brush (or a delicate finger tip will do!) and lightly rub it inside each of the flowers of a plant. Continue to do this once a day for a couple of weeks and you should soon start to see some fruit setting.
2. Lack of Air Flow
Related to pollination — chilli flowers can self-pollinate with the help of natural air movement, which causes pollen to fall from the anthers onto the stigma within the same flower. In a sealed greenhouse or a still indoor room this doesn’t happen as reliably
The fix: As a general rule once night time temperatures reach 10 degrees I leave my greenhouse windows and doors open 24/7, only closing them when extreme weather is forecast.. This allows maximum natural airflow through the plants. A small oscillating fan running on a low setting in an indoor setup works very well — it simultaneously improves pollination, strengthens stems, and reduces humidity that can cause fungal problems. Even gently shaking your plants for a few seconds each day helps.
3. Over watering
Another cause of flower drop in chilli plants is over watering. If you think lack of pollination is not to blame then it may be worth scaling back your watering to maybe just twice a week (depending on the weather of course). In addition remember that some flow drop is natural so do not get too concerned if not all your flowers turn into blistering hot peppers.
4. Not Harvesting Pods
Chilli plants, like any other are designed to produce seed that will get scattered by natural means and therefore multiply. If your plant already has a few chillies on that are ripe, be sure to pick them to encourage further fruit to set. If you leave chillies on a plant when ripe you may find that any new flowers drop failing to result in any new fruit as the plant uses it’s energy to maintain the fruit on the plant rather than produce any new chillies.
5. Temperatures Extremes
Like most plants, chillies like stable temperatures. Exposing flowering chilli plants to very low night time temperatures, or scorching dry daytime heat can result in flowers dropping off. To avoid these severe temperature fluctuations I always keep an eye on the weather forecast and take remedial action if wild swings in temperature are likely.
In extremely hot weather I add shade to my greenhouse ceiling and walls. The easiest (and cleanest) way I have found to do this is to hang some horticultural fleece up inside my greenhouse using bulldog clips to hold it in place. I’ve found this method far quicker to put up and remove that traditional greenhouse paint on shading.
6. Under/Over Feeding
Under feeding plants places them under stress which can be a cause of flower drop. I feed regularly with chilli focus fertilizer once my plants are mature to ensure they have a steady supply of nutrients.
Adding too much fertilizer to your plants can also put them into shock which can cause flower drop. Even if not in shock too much nitrogen can encourage the plant to produce more vegetative growth at the expense of flowering/fruiting.
When it comes to feeding my plants I prefer the little and often approach as I believe that chilli plants respond better to stable conditions.
7. Low Humidity
Chilli plants evolved in tropical and subtropical environments where humidity is significantly higher than a typical UK home or greenhouse. In very dry conditions (which can occur in greenhouses or near central heating radiators) pollen can dry out and becomes non-viable, causing flowers to drop without setting.
The fix: Mist your plants with a water spray bottle in the mornings during dry spells. This temporarily raises local humidity around the flowers without leaving foliage wet overnight (which risks fungal problems). A small tray of gravel filled with water placed near the plants evaporates slowly and raises ambient humidity gently.
8. Not Harvesting Ripe Pods
If you do not harvest ripe pods the plant will divert energy to maintain the existing fruit which contain viable seed. Producing viable seed is the plants primary biological goal so this will be prioritised over everything else by the plant. This can divert energy away from setting new flowers.
The Fix: Pick ripe chillies right after they reach maturity/full ripeness. This will encourage the plant to keep setting more flowers to produce more fruit (and viable seed). See our guide to when chilli peppers are ripe for exactly what to look for.
9. Natural Flower Drop Through the Fruit
This is worth knowing about because it can cause unnecessary alarm. When a chilli pepper successfully sets and begins to develop, the flower petals and the spent flower often fall away as the tiny fruit pushes through. This looks like flower drop but is actually the opposite — it’s a sign the flower successfully set and a chilli is forming.
Look closely at the base of the dropping flower — if there’s a tiny swelling at the point where the flower stalk meets the stem, that’s a baby chilli. The flower drop is natural and healthy. If there’s no swelling and the stem behind the dropped flower looks clean, the flower dropped without setting.
Chilli Plant Flower Drop Diagnosis
Not sure which cause applies to you? This checklist should help narrow it down:
- All flowers dropping, growing indoors or in a greenhouse with no insects → Lack of pollination. Hand pollinate immediately.
- Flower drop started after a cold snap or late frost → Temperature stress. Check overnight minimums and protect plants if below 10°C.
- Flower drop during a heatwave, greenhouse very hot → Heat stress / non-viable pollen. Shade and ventilate.
- Compost looks wet, plant has been watered frequently → Overwatering. Allow to dry out and reduce frequency.
- Compost bone dry, plant has wilted recently → Underwatering. Water immediately and check daily.
- Flower drop began within two weeks of repotting → Repotting shock. Allow plant to settle, don’t feed, reduce sun exposure temporarily.
- Plant has ripe chillies that haven’t been picked → Pick them immediately to free up the plant’s energy for new flowers.
- Flowers drop, plant looks very lush and leafy → Possible overfeeding with nitrogen. Switch to high-potassium tomato feed at half strength.
- Flowers drying out and dropping, growing near radiator or in very dry conditions → Low humidity. Mist plants in mornings.
- Tiny swelling visible behind dropped flower → Normal — a chilli is setting. No action needed.
FAQ
Is some flower drop normal on chilli plants?
Yes. Often very healthy chilli plants drop some flowers. The plant can produces more flowers than it can support as a buffer against poor pollination conditions. Some drop is completely normal and not a cause for concern. It’s only when virtually all flowers are dropping without any fruit setting that you need to investigate.
Why does my greenhouse chilli keep dropping flowers even though I hand pollinate?
In this scenario the most likely cause is that the pollen itself is non-viable. This can happen in very high temperatures (above 35°C) particularly when combined with very low humidity (which can be the case in greenhouses). Try pollinating at a different time of day (morning rather than afternoon when the greenhouse is at its hottest) and consider opening vents to reduce temperature.
When should I stop worrying about flower drop?
Once you can see fruit setting and developing on the plant — tiny chillies visible behind spent flowers — the problem is resolving. Continue hand pollinating if growing indoors, maintain stable watering and temperatures, and the plant should settle into a productive fruiting rhythm.
How do I hand pollinate chilli plants?
Use a small artist’s paintbrush or cotton bud and lightly brush inside each open flower, moving from flower to flower. Do this once a day when flowers are fully open.Continue for two to three weeks. You should start to see tiny fruit swellings forming behind successfully pollinated flowers within 7-14 days.
Why are my chilli plant flowers dropping off before they open?
Flower buds dropping before they even open is usually a sign of significant stress on the plant. Common causes are temperature fluctuation, underwatering or root damage from repotting. It can also happen when a young plant flowers before it’s fully established. If your plant is small and flowering early, consider removing the first flush of buds to allow the plant to develop more fully before committing to fruiting.
Hi, I have read your article. I will go through your points and think i may find a the solution.
Thanks a lot for a helpful study.
Hi nice to find your site. One of my cayennes has started having yellowing leaves which fall of and before has suffered from continual flower drop (over 50) despite hand pollination for . would this ever occur due to much nutrient ? as lack of water is easy to tell and im certain they have not been over watered.
or might it be too much heat ?
i am confused and sad. every flower dropped is a ripe pod lost !
Hawk – Some flower drop is inevitable. Yellow leaves can be be a few things such as nutrient defficiency, cool night time temps, shock, over watering. Check out this link: https://www.thechilliking.com/chilli-plants-turning-yellow-how-to-resolve/
HI; how do i know when my chillies are ripe and ready to pick them from the plant ? Any help would be great thanks…
They will change from Green to either yellow, orange or red when ripe.
I’ve found it so hard to pollinate my flowers as they have flowered twice this year all resulting in flower drop they are watered perfectly – the temperature it right – sunlight 18 hours a day – and there still dropping off. when i rub the cotton bud round i see alot of pollen falls out of the flower into the air almost like dust is this normal?
For outdoors, I let nature take its course. When overwintering, I use a Qtip – just gently rub it on the pistils and the pollen will translate to the Qtip, which then moves onto a new flower with each successive pollination effort. My overwintered Lemon Drop has something like 75 varyingly ripening chilis – all by my Qtip work! =)
thanks a lot solutons very helpful