How Often to Water Broad Beans
Here's some good news: when it comes to watering, broad beans ask for very little. They grow through the cool, damp months of late winter and spring, when the soil usually holds plenty of moisture, so in open ground they often need very little help from you. There's one important exception, though, and getting it right can noticeably increase your crop.
How often should you water broad beans?
Planted out in a bed, broad beans can usually rely on the weather, apart from on fast-draining sandy ground or in an unusually dry spring. What makes the biggest difference is two good soaks: one as the plants start to flower, and a second about a fortnight later. Beans in containers are the exception: they can run dry quickly, especially once the weather warms up.
Why broad beans need less water than most crops
Broad beans are sown in autumn, late winter or early spring, and do most of their growing before the heat of summer arrives. British spring weather tends to keep the ground damp, and a layer of compost over the soil after planting holds on to that moisture for longer. That's very different from summer crops like runner beans and courgettes, which grow through the hottest, driest weeks and need watering constantly.
The two waterings that matter most
Flowering is the moment that counts. Broad beans decide how many pods to set while they're in flower. If the soil is dry just then, many of the flowers drop without forming a pod.
To give them what they need:
As the first flowers open, water deeply, so the moisture soaks well down to the roots.
Around two weeks later, give them another long, thorough drink.
Between and after those soaks, water only if the weather turns dry for more than a week or so.
This simple routine is one of the easiest ways to get a better harvest.
Watering autumn-sown broad beans over winter
Autumn-sown beans spend the winter outdoors and almost never need watering until spring. The bigger risk at this time of year is too much water rather than too little. Soggy, cold soil can rot seeds and roots, which is why autumn sowing works best in ground that drains well.
If you've sown in autumn, leave the watering can in the shed until the plants are growing actively in spring.
Broad beans on light, sandy soil
On sandy or light soils, water drains away quickly and the ground dries out much sooner. There, keep an eye on the soil through spring, and water whenever it's dry a few centimetres down, especially once the plants are tall and leafy.
A good layer of compost or well-rotted manure dug in before sowing, and another spread over the surface afterwards, helps light soil hold much more water.
Watering broad beans in containers
A pot holds only a limited reserve of moisture, so container-grown beans need much closer attention than their cousins in the bed. Check the compost every few days in spring, and daily once the weather warms up. Water until it runs from the base of the pot.
Pot-grown plants also benefit from feeding once they start to flower. A high-potash liquid feed, such as tomato feed, every fortnight helps them keep producing pods. Dwarf varieties are the best choice for containers.
For container advice, see growing broad beans in containers
Signs of watering problems
Dry at flowering: plenty of blooms, but only a scattering of pods, with flowers falling off.
Too dry in pots: plants wilting, especially on warm afternoons, and slow growth.
Too wet: yellowing lower leaves, poor growth, or seedlings rotting in cold, soggy soil. Heavy, waterlogged ground also encourages chocolate spot.
If your plants are struggling for other reasons, see why broad beans don't grow
You can also read more in how often to water a vegetable garden
Healthy broad bean growth
Broad beans are low-maintenance to water. Improve the soil before sowing, mulch after planting, soak them twice around flowering time, and check pots regularly, and they'll largely look after themselves.
For full growing advice, see how to grow broad beans in the UK
Common questions
Do broad beans need a lot of water?
Not usually, if they're in the ground. Spring rain is often enough. The key times to water are as the plants start flowering and again about two weeks later. Beans on light, sandy soil or in pots need checking more often.
When should I water broad beans?
When the lowest flowers open, water the row slowly and heavily, then repeat the soak a fortnight on. That's when watering makes the biggest difference to how many pods form.
Should I water broad beans in winter?
No. Autumn-sown broad beans almost never need watering over winter, and waterlogged soil is the bigger risk. Start watering only if spring turns dry, and especially at flowering time.
Do broad beans in pots need more water?
Yes. Containers run dry far sooner than open ground. Feel the compost twice a week or so in spring, and every day once it gets warm. Water until it drains out of the bottom, and feed every fortnight once the plants flower.
Watering advice checked against RHS guidance.