Why Hydrangea Leaves Turning Yellow – What to do (Iron Fix)

Hydrangeas are renowned for their breathtaking flowers and abundant foliage, but when the leaves start to turn yellow, it can be a cause for concern. Yellowing leaves in hydrangeas can indicate various underlying issues that may impact the plant’s health and aesthetics. Understanding the reasons behind this discoloration is crucial in diagnosing the problem correctly and implementing effective solutions. In this guide, we will delve into the common causes of hydrangea leaf yellowing and provide practical tips and remedies to address and prevent this issue. Whether you’re an experienced gardener or just starting out, this guide will equip you with the knowledge to maintain vibrant and thriving hydrangeas.

Hydrangea leaves can turn yellow due to various reasons, including overwatering, underwatering, excessive exposure to direct sunlight, or iron deficiency. To address the problem of yellow hydrangea leaves, there are several steps you can take. If the issue is too much direct sunlight, consider moving the plant to a partially shaded area. Hydrangeas generally require around 6 hours of sunlight per day, so providing them with a balance of sun and shade can help alleviate the problem.

If the yellowing is due to iron deficiency, a fast-acting sequestered iron supplement can be used. Applying the supplement directly to the leaves can help accelerate absorption. Ensure to follow the instructions provided on the product for the correct application method and dosage.

Proper watering is also crucial for maintaining healthy hydrangea leaves. Depending on the humidity and temperature, hydrangeas typically require moderate watering at least 2-3 times per week to prevent dehydration and leaf yellowing. Additionally, providing the plant with Epsom salt and a nitrogen-rich fertilizer can help keep the leaves green and vibrant.

To improve the overall appearance of the plant, it is advisable to remove any yellow leaves using a sharp and sterilized tool. This promotes better air circulation and reduces the risk of further leaf yellowing.

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Remember to water your hydrangea when the soil is dry or during hot weather to prevent yellowing of the leaves. By following these tips and providing proper care, you can revitalize your hydrangea and enjoy its lush green leaves once again.

Hydrangea leaves Turning Yellow due to overwatering which drains out important nutrients. Also yellowing hydrangea Leaves could impact the root section of hydrangea plant that causes rotting. leaves nutrient deficiency is major reason why yellowing Leaves occur in these plants, generally it means the plant might have low nitrogen in soil that causing Leaves to lose color. To fix the hydrangea yellow Leaves problem adding a specific type of fertilizer could balance the nutrients which can resolve the issue. plant food provided to these plants every month in the growing season.

There are other major reasons like caring mistakes, left plants in waterlogged situations. Now let’s Read what are the causes of Hydrangea leaves Turning Yellow :

  1. Low in Iron
  2. Waterlogged soil
  3. Temperature changes
  4. Soil Underwatered
  5. Leaves are burned because of Heavy Sun
  6. Lack of light
  7. Over Alkaline Soil
  8. Additional problems

Hydrangea Leaves Turning Yellow

1. Iron deficiency

The yellowing of hydrangea leaves can indicate a problem, possibly due to iron chlorosis or insufficiency. Iron is essential for chlorophyll production in plants, and chlorophyll is necessary for photosynthesis. When there is a deficiency of iron, it can lead to a deficiency of chlorophyll, resulting in yellowing leaves.

One common cause of iron deficiency in hydrangeas is alkaline soil. When the soil pH is above 7.0, it reduces the availability of iron for the plants. Overwatering can also contribute to soil iron depletion, exacerbating the iron deficiency issue.

To identify whether iron shortage is the cause of the yellowing leaves, a soil test can be conducted. Based on the results, measures can be taken to address the problem. Lowering the soil pH can be achieved through the use of sulfur or iron sulfate. Additionally, applying chelated iron fertilizer can help the plant absorb the necessary iron.

It is important to note that while iron shortage can cause yellowing leaves in hydrangeas, there are other factors that can contribute as well. Insects, diseases, and environmental stresses can also play a role. Therefore, it is essential to thoroughly examine and evaluate the plant, considering all possible causes, before attempting to fix the issue.

By identifying the underlying cause of the yellowing leaves and taking appropriate measures, you can address the problem and restore the health and vibrancy of your hydrangea plant.

Best Iron Fertilizer : Check on

Hydrangea white

2. Overwatered Soil

The second most common problem for hydrangea leaves turning yellow is when the owner overwaters the plants. Although hydrangeas love moisture, they do not thrive in excessively wet conditions. Therefore, it is important to be mindful of watering practices.

When the soil retains excessive water, the roots can start to rot and become damp. This leads to the plant displaying symptoms such as leaf drop and, ultimately, death. To address this issue, it is necessary to reduce watering and monitor the plant’s response.

Waterlogged conditions caused by overwatered soil can be mitigated by placing small stones at the base of the pot. This can be done during the repotting process and will help improve drainage.

The frequency of watering depends on the moisture level of the top layer of soil. If the soil feels dry, it is time to water the plant. However, if the soil is still moist, it is best to wait and only water when the top inch or two of soil has dried out.

By following these two conditions, you can effectively address this issue.

There are also other problems that can affect hydrangeas and their varieties, which I will discuss next.

Hydrangea Leaves Turning Black
I, MJJR, CC BY 2.5, via Wikimedia Commons

3. Temperature changes

These plants work best in ideal temperatures of 69-72 degree F and they like warm climates. When located in low temperature they may freeze and then dies faster. When this plant sees a sharp rise or fall in climatic conditions it may become hard for the plant to survive. 

Also Put this in a location where there are no heavy winds as leaves of hydrangea will begin to turn yellow if it dries more than normal Or it may affect its overall growth.

Lotusmagus.com advises : Growing your plant near a wall can not only protect it from winds but also provide support for its normal growth. You can place it near the fence outdoors to reduce the wind effect.

Draft variety of hydrangeas can easily get to diseases because of low tolerance power. So Keep them in ideal room temperature in the winter season this may protect the plant from freezing at below 40 degree F so take good care of them and it will survive and regrow once spring starts and you place them in its original location where it stays in whole summers.

hydrangeas meaning

Also Read : Mother Of Thousands Plant – Care,Propagation,Benefits,Varieties(Guide)

4. Soil Underwatered

If the soil near the root section constantly feels dry then your plant leaves will turn yellow in no time and fall eventually. Initially you may find yellowing of tips first then it may cover the whole leaf so how will you solve this problem? let check.

Firstly soil shouldn’t be dried out completely you need to pour water and keep it moist. If the soil is getting dried out faster then put some mulch on the surface of the soil that may help the water to stay for a long period of time. Pouring water will solve the issue and you can put water in every day.

For Mulching You can use wood chips, straws ,cones or shredded conifers.

If you have planted these hydrangeas near a Big tree then it may cause problems as trees can absorb the water easily from the side soil and even take the other plant water if needed. Then the other plant will feel less water which makes them sad as their leaves will start to fade or drop.

Hydrangea Leaves

5. Leaves burn because of Heavy Sun

Leaves can suffer from burning when exposed to intense sunlight for extended periods. This phenomenon is particularly relevant when it comes to plants such as hydrangeas. If these plants are placed in direct sunlight, they may encounter issues with leaf burning. The excessive strength of the sun’s rays can cause damage to the leaves, leading to various visible signs of distress. One of the initial indicators of a problem is the drying out of the affected plant, accompanied by the appearance of yellowing leaves.

To prevent leaf burning and maintain the optimal health of your plants, it is crucial to select a suitable location that offers appropriate shade or indirect sunlight. This involves finding an area where the intensity of the sun’s rays is not overwhelming for the specific plant species you are cultivating.

It is important to note that certain indoor plants are particularly sensitive to sunlight and may even have an aversion to it. These plants fare best in environments with low light levels or areas that receive filtered or indirect sunlight. Shielding these plants from the intense rays of the sun is crucial for their growth and overall well-being, as direct sunlight can have detrimental effects on them.

what do blue hydrangeas mean

6. Lack of light

These hydrangea plants like bright light and no direct sunlight. If they don’t get proper light then the root is going to get rot in water and then leaves will turn yellow.

You should choose a place where it gets some sort of sunlight and morning sun is preferred because light doesn’t harm plants but provides energy and makes it healthy. And that 2-3 hours light is genuinely pure , but remember afternoon sun is still a problem so place it where it only gets morning sunlight.

Direct sunlight causes leaves to burn spots that don’t look good. Also They don’t like dark places so make sure to put them in a partial shade area , you can also put them under a big tree or a shrub that is bigger in size.

hydrangea leaves falling off

7. Over Alkaline Soil

Another problem for hydrangea leaves turning yellow is because its soil has more alkaline (pH 7) than acidic. pH value of hydrangeas must be 5.2 to 5.5 and that needs to be acidic not basic.

All varieties of hydrangeas like the acidic soil and hate the basic/alkaline. So before doing any potting make sure to check your soil for that and if found to be true then maybe this is the reason for yellowing.

To increase the soil pH to make it acidic you need to put citric or acetic acid in it or also lime juice can also work about 4-5 ml with 800ml of water. Also If you want soil to retain water then make sure to put some mulch in it.

Hydrangea meaning

8. Additional Information

When your hydrangeas start showing yellow leaves, it can indicate a deficiency in nitrogen. Nitrogen is a vital nutrient for plant growth, and its scarcity can manifest as pale or yellowing foliage. To address this issue, it’s important to provide your plants with an adequate nitrogen source. This can be achieved by using a balanced fertilizer formulated specifically for hydrangeas or by incorporating nitrogen-rich organic amendments into the soil.

However, if you observe a distinct “V” pattern forming in the yellowing leaves, it suggests a possible magnesium deficiency. Magnesium plays a crucial role in various plant functions, including chlorophyll production. Insufficient levels of magnesium can cause leaves to develop a characteristic yellowing pattern, starting at the edges and forming a “V” shape towards the center.

To remedy a magnesium deficiency in hydrangeas, you can consider using epsom salt, which contains magnesium sulfate. Epsom salt is widely available and can be purchased from gardening stores. When using epsom salt, it’s essential to follow the instructions provided with the product. Typically, you would dissolve around 20 grams of epsom salt crystals in approximately 9 liters of water. This solution can then be poured directly onto the root area of the plant.

However, it’s important to accurately diagnose the specific nutrient deficiencies before applying any remedies. Conducting a soil test or seeking advice from a gardening expert can help determine the precise nutrient requirements of your hydrangeas. Additionally, it’s crucial to consider other factors that may contribute to leaf yellowing, such as improper watering, diseases, or pests, and address those accordingly.

yellowing of leaves shows Iron deficiency also that can be corrected with iron chelates. But all and all these deficiencies are resolved with 1 solution that is using fertilizer that can be used in spring to mid summer.

Hydrangea Leaves

Also Read : White Desert Rose – Variegated For Sale, Growing Caring Guide

How to Prevent Yellowing of Leaves

  1. To provide all the necessary requirements and basic growing conditions you can easily prevent hydrangea leaves turning into yellow. And Here are some steps to prevent this issue. Follow it and Do Care.
  2. It’s Important to take Care of your plant and prevent it from completely drying out that directly affects the leaves. So Keeping it moist can be useful.
  3. Selecting a location which can be best for partial sunlight that needs for its flower and overall development of hydrangea.
  4. Less watering in Winters and Keep in check for proper irrigation of water. It shouldn’t be stuck in the soil , and drain out properly.
  5. Check Soil pH can be helpful in determining how its health is and what are the needs or deficiency it has or sometimes over fertilizing can become a problem.
  6. No need of watering in the rainy season.
  7. Before flowering You can use fertilizer that can be helpful in maintaining the health of hydrangeas.
  8. Diseased stems or leaves that become pale or having cuts can be removed using the pruners but before that sterilize the cutting tool to make it clean from any bacterial infection.
  9. If you encounter any fungal infection or any pest infestation use pesticide or fungicide to get rid of them. Use it Every month or read instructions from the note.   

Hydrangea white

Other Hydrangea leaves problems

  1. Brown Spots
  2. Powdery Mildew

Brown Spots on Hydrangea leaves

Brown spots on hydrangea leaves are a common occurrence and generally do not pose a significant threat to the overall health of the plant. However, they can detract from the plant’s aesthetic appeal. These spots are typically caused by fungal or bacterial infections, and they tend to appear towards the end of summer or in mid-autumn.

While the brown spots may not affect the entire plant, they can make it look less attractive. To improve the plant’s appearance, you have a couple of options. You can pinch off the affected leaves, removing the brown-spotted foliage. Another approach is to conduct selective pruning, trimming back branches and leaves that show signs of infection. By doing so, you encourage fresh growth and give the plant a rejuvenated appearance.

It’s worth noting that hydrangeas are resilient plants. Despite the presence of brown spots and the removal of affected leaves, they will usually regrow new leaves in the following spring. The development of buds and the blooming process are typically unaffected by these infections. The plant can survive and continue to thrive naturally without any intervention. Over time, the infected leaves may turn yellow and fall off, making way for new growth.

While brown spots on hydrangea leaves may not be a cause for immediate concern, it is important to monitor the plant closely. If the infection spreads rapidly or causes severe damage, it may be necessary to take further action. Seeking guidance from a gardening expert or using appropriate fungicides or bactericides can help manage the infection and prevent its recurrence.

Maintaining good plant hygiene, ensuring proper air circulation, and avoiding over-watering can also contribute to minimizing the occurrence and spread of fungal or bacterial infections on hydrangeas. Regular care, including proper pruning techniques and creating a healthy growing environment, will support the plant’s overall vitality and resilience.

hydrangea leaves falling off

Here are 2 fungal infection that affect hydrangeas

  • Anthracnose
  • Cercospora leaf Spot

Once a plant infected with both leaf spots disease makes the green leaves into pink or brown , you may also see most at the spots on the tip and then move to the middle of the base of the leaves.

When we talk about bacteria doing this leaf spot one such pathogen is Xanthomonas campestris. This will put various spots on the veins and lower portion of the leaves generally into red or purple. Veins spots will move through the line & reach to other parts of the leaf section.

So You might have a question in mind on How to treat this brown Spots

Most probably you need garlic oil or compost tea or hydrogen peroxide(this is famous) and spray on the infected leaves and to the whole plant also.

Chemically fungicides can be used to treat this if you want an easy to use solution without doing any hard work. This can be used in every 15 days gap depending on how much the infection is.

Powdery Mildew on Hydrangea

Powdery mildew is a fungal disease that commonly affects hydrangeas, and it can be easily identified by the presence of a white powdery coating on the leaves. This powdery substance is a sign of the fungal spores that have colonized the plant’s foliage. Recognizing this issue early on is crucial in order to take immediate action and prevent further harm to the plant.

If you discover powdery mildew on your hydrangea leaves, it is important to address it promptly. One effective solution for combating powdery mildew is the use of neem oil. Neem oil, derived from the neem tree, is a natural and organic product known for its antifungal properties. Applying neem oil to the affected leaves can help control and inhibit the growth of the fungal infection. It is recommended to thoroughly cover both the upper and lower surfaces of the leaves with neem oil, following the instructions provided with the product. In some cases, multiple applications may be necessary to effectively manage the powdery mildew.

If neem oil is not readily available, or if the powdery mildew persists despite treatment, you may need to consider using a fungicide specifically formulated for powdery mildew control. Fungicides containing active ingredients like sulfur or potassium bicarbonate can be effective in managing the fungal disease. It is essential to carefully read and follow the instructions and safety guidelines provided with the fungicide product.

Powdery mildew can be detrimental to the overall health of hydrangea plants as it disrupts their ability to photosynthesize and absorb necessary nutrients. If left untreated, the disease can weaken the plant, leading to stunted growth, defoliation, and even plant death.

To minimize the risk of powdery mildew, it is important to maintain good plant hygiene and create favorable growing conditions for hydrangeas. This includes providing adequate air circulation around the plants, avoiding overhead watering, and ensuring proper spacing between plants to reduce humidity. Regular monitoring of your hydrangeas and taking immediate action at the first sign of powdery mildew will help protect the plants and promote their overall health and vigor.

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People Also Ask

What does Overwatered hydrangea look like?

Overwatering hydrangeas may harm their health, especially leaf development. Drooping leaves are the main indicator of overwatering hydrangeas. Yellow or brown leaves may also wilt.

Root rot from overwatering may worsen leaf discoloration and degradation. Root deterioration is caused by excessive soil moisture. Dark brown or black roots, mushiness, and a terrible odor identify it. The plant must be repotted in new, well-draining soil after discarding the tainted material.

Hydrangeas need deep, infrequent watering to avoid overwatering. Avoid direct sunlight and choose a container with good drainage.

Why are my hydrangea leaves wilting and turning yellow?

Hydrangeas may wilt and yellow for several causes. Watering issues are widespread. Underwatering causes withering, while overwatering yellows leaves. Hydrangeas need well-drained, wet soil. Lighting also matters.

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Lotusmagus is a website about plants and flowers by Amelia Clark. Copyright Marked]

Stems deteriorate from long-term solar exposure. Wilting may also arise from sudden temperature fluctuations.

Soil pH may also alter nutrition absorption, causing yellowing foliage. Hydrangeas that droop require care and new growth circumstances.

How often do hydrangeas need to be watered?

Hydrangeas need enough irrigation. They need more water than typical garden plants and might wilt rapidly. During the growing season, water 1 inch each week and deeper 3 times a week to promote root development. All hydrangeas need continuous watering, but bigleaf and smooth ones need more.

Overwatering causes root rot and other problems. Water established hydrangeas when the first inch of soil feels dry. This provides adequate water without drowning the roots.

Hydrangeas require continuous watering so that they don’t feel dehydrated. Give them plenty of water, but don’t overdo it because it may end up root rot so make sure the soil drains well.

Should I cut off wilted hydrangea leaves?

Deadheading during flowering season helps hydrangeas look their best and generate fresh flowers. Meyers advises pruning hydrangeas according to species.

Dead stems or blossoms should always be pruned close to the bloom. Before August, clip spent blossoms with lengthy stems.

Some individuals recycle dead blossoms, while others make interior arrangements. Some gardeners let them fall naturally throughout winter.

Final Thoughts

[ Copright Notice: The content is first published in lotusmagus.com website, if you are seeing this article in other website then it has been copied fully. ]

I Hope you get the solution by reading all the problems I provided on “Hydrangea Leaves Turning Yellow “. Gardeners worry over yellowing hydrangea leaves. Yet, knowledge and action may address the problem. Simple remedies may help a plant recover from overwatering, nutritional deficits, pests, or soil pH imbalances. Understanding hydrangea leaf yellowing causes and remedies might help you keep your plants healthy.

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Amelia Clark

I'm Amelia Clark, a seasoned florist and gardening specialist with more than 15 years of practical expertise. Following the completion of my formal education, I dedicated myself to a flourishing career in floristry, acquiring extensive understanding of diverse flower species and their ideal cultivation requirements. Additionally, I possess exceptional skills as a writer and public speaker, having successfully published numerous works and delivered engaging presentations at various local garden clubs and conferences. Social Profile: LinkedIn  YouTube  Pinterest Facebook