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Why Are My Runner Bean Plants Turning Yellow – 4 Reasons This Can Happen

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Green beans are an excellent addition to any garden. Whether you’re a novice gardener or an experienced farmer, they are a fun plant to deal with and it’s worth cultivating them on your own land.

While the growing process appears to be quite simple, there are several difficulties that may manifest themselves in the form of fading leaves.

So, do you have the question of why are my runner bean plants turning yellow? We have got just the perfect answer for you in this article as we have broken down a few possible reasons.

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Why Are My Runner Bean Plants Turning Yellow?

Some of these can also affect the vegetable production of your plant, which is a big concern. Yellow leaves means that your plant has an issue that should be addressed during the growing cycle. It’s a sign of the plant’s poor health, and it needs to be addressed right now.

There are a variety of reasons why this could be happening, so there isn’t always a one-size-fits-all approach. Let’s take a closer look at the four most prevalent causes of yellow leaves on green bean plants, as well as some solutions for getting your plant back on track.

Inadequate Watering

Improper watering is the most common cause of green bean discoloration. For a variety of reasons, both under-watering and over-watering your plant might result in discoloration. The yellowing begins in isolated areas before spreading throughout the leaf.

When you don’t give your plant enough water, it won’t be able to absorb nutrients. Water is the means by which nutrients are transported to the farthest reaches of your plant. Overwatering is also harmful since it suffocates the plant, depriving it of essential nutrients.

Given that the result is the same, determining whether you are under-watering or over-watering your plant can be tricky. The answer, on the other hand, is straightforward. First, take a look at the earth to see what I mean. To determine soil moisture, insert one of your fingers a few inches deep into the dirt.

This is critical to do before watering your plant. Give your plant a big sip of water if the soil appears to be dry. If you’re growing green beans in a container, keep a dish underneath the pot to catch any surplus water so the roots can absorb it.

Adjusting the irrigation schedule is a simple fix. It’s possible that the soil will be damp following testing. If this is the case, stop watering for a few days. Allowing the soil to dry out a little before watering it again is a good rule of thumb.

Green beans require around two inches of water per week to thrive. So as long as you keep your hydration in check, your plant should turn green in no time!

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Runner Bean Yellowing – via

Inadequate Sunlight

Another common cause of a green bean plant becoming yellow is insufficient sunlight. Again, maintaining a sense of equilibrium is crucial. Because photosynthesizing requires a certain amount of sunshine, you must provide it to your plant.

Photosynthesis is the process through which plants make their food, and it requires sunlight. If your plant doesn’t get enough sunlight, the leaves will turn yellow due to nutrient deficiency. On the other hand, if they become too numerous, the plant may begin to burn, halting production as well.

When your green bean leaves turn yellow due to a lack of sunlight, the lower leaves may be the first to turn yellow.

In comparison to other potential issues, this is also a more straightforward cure. When designing your garden, make sure your beans will be in a location that receives plenty of full sunlight while yet offering adequate shade. This will keep the fabric from fading in the future. Otherwise, you may need to relocate your plants to a more suitable location to restore their health.

Temperature Issues

In addition to sunlight, your green beans must be exposed to the appropriate temperatures. They prefer warm weather, preferring temperatures of 70 to 80 degrees Fahrenheit. Anything less than this can cause mature leaves to turn yellow and impede much further growth.

The same is true for temperatures above 90 degrees Fahrenheit. It’s also worth mentioning that cold temperatures can have a significant impact on green bean production, so make sure your environment is suitable for these plants.

If you reside in an area where it is usually too cold for green beans to grow outside and you have the resources, you can grow them in a greenhouse. They will be able to maintain the warm temperatures they require for most of the year in this manner.

If the discoloration is caused by a low temperature, this should prevent the leaves from yellowing. When planting green beans in a greenhouse, be sure to offer appropriate sun protection because the circumstances and heat might cause burning. Otherwise, when your plants are placed outdoors, you should endeavor to keep them insulated from chilly draughts.

Root Damage

Compacted roots might be the cause of yellowing foliage if you planted your green beans in a container. The roots of a plant that has outgrown its container become compacted and injured, causing the leaves to be yellow and fall off.

This is due to the roots’ inability to transport the nutrients and water required to keep the plant healthy. Simply replant your green beans in a larger container, rather than directly into the soil, as a remedy. Pruning the roots can make a difference as well.

It’s a good idea to check the color of the roots whenever you need to replant your green beans. The color of good roots is a delicate, creamy golden. Darker roots, especially if a foul odor is present, could indicate that rot has taken hold. Unfortunately, if at all feasible, it would be best to discard the plant and start over.


So, now you have the answer to the question, “Why are my runner bean plants turning yellow?”

If you need any additional help, you can always reach out to us on the email provided below.

Best of luck!