Hydrangea leaves can turn yellow due to an iron deficiency, chlorosis, or overwatering.
Chlorosis develops when a plant cannot absorb enough iron due to an excessively high pH of the soil.
Check your soil’s pH. Consider using Yates Soil Acidifier, Yates Hydrangea Blueing Tonic, or Yates Iron Chelate to decrease it if it is higher than 6.
How should I care for my hydrangeas’ yellow leaves?
When in good health, hydrangea leaves are typically green, and the blossoms are eye-catching and vibrant. But when hydrangea leaves begin to turn yellow, isn’t it one of the telltale symptoms that something is wrong with this plant? What contributes to yellowing and how may it be treated?
Overwatering, excessive exposure to direct sunshine, or a lack of nutrients can cause hydrangea leaves to become yellow. Move the plant to a shaded location and drain the excess water from the pot to mend the yellow leaves. To maintain leaves healthy and green, feed the plant with nitrogen fertilizer and an iron supplement.
If you find a hardy type of hydrangea that can thrive in zones 3 and 8, and endure even some cold winter temperatures, hydrangeas are excellent plants.
How do you make the leaves of hydrangeas dark green?
Yellow hydrangea leaves are most often the result of an iron or magnesium shortage (or both).
This Doff product works quickly; I’ve observed it greening up leaves in a matter of days.
Read the rest of my guide where I go into more detail and provide long-term solutions in order to try to figure out why your hydrangea has a deficiency. I’ll also go through several additional, uncommon causes for these leaves to become yellow.
Most Hydrangeas are Deciduous
The majority of hydrangea plants are deciduous, which means that they shed their leaves every year, typically in the fall and winter.
It’s natural for hydrangea leaves to become yellow, brown, or even an off-purple color as winter approaches.
As winter draws closer, you shouldn’t be concerned about yellow leaves, but if they start to turn that color in the spring or summer—when the leaves should be a lush, healthy green—you will need to take action.
Does Your Hydrangea Have Yellow Leaves With Green Veins?
The hydrangea leaves below exhibit the first symptoms of chlorosis:
These are warning signs:
- leaf veins are green and yellow.
- less leaves
- thinner leaves
- general growth retardation
In the image below, a healthy green leaf is shown alongside a tiny yellow leaf; notice the smaller leaf’s green veins:
Another image of a young hydrangea leaf with clear chlorosis
Take note of the uniform green color across the leaf and veins in the leaf below, which was obtained from a healthy hydrangea.
Causes
Keep reading if your hydrangea plant only has yellow leaves with green veins on new growth, which is an indication of iron deficiency.
It is a sign of magnesium insufficiency if the leaves are yellow with green veins, but only on older, established leaves. There are several reasons why this can be the case.
Give Your Hydrangeas a Boost of Iron or Magnesium
Giving your hydrangeas a dosage of iron or magnesium is the first step to getting them healthy again, but this will only cure the issue momentarily; you’ll need to look a bit further to discover what caused the shortage in the first place.
Although most garden centers carry something comparable, I recommend the item below.
I’ve used Plant Tonic before on petunias and witnessed the yellow leaves becoming green in less than 5 days, so I know it’s effective for plants that lack iron.
Doff Sequestered Iron With Magnesium
Sequestered iron from Doff, which was created especially to restore yellowing leaves to full health, is quick-acting and can even be sprayed directly onto the leaves to hasten absorption.
How can you tell if your hydrangeas need more water?
If the damage is not too severe, quick diagnosis of an overwatered Hydrangeas plant will enable you to repair it. The indicators of an overwatered hydrangea are listed below.
- Change in leaf color: If you see yellowing and browning on the plant’s leaves, you’ve probably been overwatering it. This is because a plant that is overwatered will have pulpy, swampy leaves, but a plant that is underwatered will have dry, crackly leaves.
- Root rot is an indication that your hydrangeas’ roots are rotting from overwatering, but it’s not always easy to detect. An odd fragrance may give you a hint.
- Growth that is stunted: If your plant hasn’t dried out but hasn’t gotten much longer, you should suspect overwatering.
- Dropping of leaves: If both the young and the old leaves begin to fall off but your plant hasn’t dried out, you’ve overwatered it and should act right away to prevent irreparable damage.
- Mold development: Molds are fungi that flourish in extremely moist environments or soil. Consider the likelihood of an overwatered plant if you see an increased growth of mold around your hydrangeas.
How frequently should a hydrangea be watered?
Although the hydrangea’s leaves and flowers seem delicate, little careful care is actually needed for them. Everything you need to know about caring for hydrangeas is provided in these recommendations.
- Over the course of the growing season, water at a rate of 1 inch per week. To promote root growth, deeply water three times each week. All varieties of hydrangeas benefit from constant moisture, but bigleaf and smooth hydrangeas need more water. To water thoroughly while keeping moisture off the flowers and leaves, use a soaker hose. Hydrangeas won’t wilt as much if they are watered early in the day on hot days.
- To keep the soil around your hydrangeas cool and moist, add mulch. Over time, an organic mulch decomposes, supplying nutrients and enhancing soil texture.
- Apply fertilizer according to the type of hydrangeas you have. Every variety has varied requirements and will profit from applying fertilizer at various times. A soil test is the most effective tool for determining your fertility requirements.
- In March, May, and June, bigleaf hydrangeas require numerous mild fertilizer applications.
- Two applications in April and June work best for oakleaf and panicle hydrangeas.
- The only time smooth hydrangea plants require fertilizing is in the late winter.
- By selecting cultivars with resistant characteristics, you can avoid pests and diseases. Hydrangeas can have leaf spots, bight, wilt, and powdery mildew. Although they are uncommon on hydrangeas, pests might arise when the plants are under stress. Aphids, leaf tiers, and red spider mites are examples of potential pests. Your best line of defense is to properly care for hydrangeas.
Are hydrangeas suited for Miracle Gro?
There is no need to buy expensive plant food. This cost-effective alternative has a 15-30-15 N-P-K composition that encourages more flowers per shrub and colorful flower heads. Including hydrangeas, this all-purpose blossom enhancer can be applied to a large selection of permanent and annual blooming plants.
It offers a variety of minerals, such as iron, copper, and boron, to complement typical dietary deficits. For the biggest, brightest blooms and healthiest plants, the water-soluble formulation should be applied every 7 to 10 days throughout the growing season.
- Water-soluble fertilizer, type
- Ratio of NPK: 15-30-15
- Approximately 1.5 pounds
- encourages most flowers to bloom more
- Easily combines in a watering can
- increases some plants’ size
- Must be routinely administered and suitably diluted.
Which fertilizer is ideal for hydrangeas?
When purchasing fertilizer, check the labels to see how much nitrogen (N), phosphate (P), and potassium are present (K). A general-purpose, balanced fertilizer such a 10-10-10 N-P-K or 12-4-8 N-P-K is typically best for hydrangeas. Consider using a fertilizer with additional phosphorus if you want your hydrangea blossoms to be bigger and more numerous.
Since phosphorus is the middle element, fertilizer with the formula 10-20-10 will do. Choose a slow-release granular fertilizer with the designation “bloom boost” if you’re looking into it because it might also include more phosphorus.
Why are the leaves on my hydrangea bright green?
Nitrogen deficiency manifests itself in hydrangea leaves similarly to other nutrient deficiencies. Nitrogen is easily transported through plants. The nutrient rushes to support the plant’s newest growth when there is a shortage. Older foliage loses the nitrogen it would normally have due to this movement. The signs of a nitrogen shortage are first visible on older, lower-growing hydrangea leaves.
Low nitrogen levels cause the entire leaf to turn a pale yellow-green color. This also applies to the leaf veins, which frequently remain green while other nutrient deficits occur. Plants with little nitrogen also develop slowly and unevenly.
What is wrong with the leaves on my hydrangeas?
Most members of this plant family, including hydrangeas, are susceptible to the fungus Cercospora, which causes leaf spotting. From July to fall, it is typical. The fungus lives in the soil and is transferred to the plant by rain or overhead irrigation. Usually, plants become infected a month or two before leaf spots show up.
How frequently do I need to fertilize my hydrangea?
In order to give your hydrangeas an early-season boost, you should typically fertilize them in the spring right before they start to leaf out. During July’s growing season, fertilize them a second time. Two applications of the fast-release fertilizers are necessary in the summer.
Do hydrangeas like shade or the sun?
With the ideal balance of morning sun and afternoon shade, hydrangeas flourish. Even the sun-loving Hydrangea paniculata will thrive in some shade. Some hydrangea cultivars may survive complete shadow, though.
The oakleaf hydrangea, also known as hydrangea quercifolia, is a substantial species of hydrangea that may reach heights of up to eight feet. In a shade garden, this big bush makes a beautiful backdrop. The height will provide excellent midsummer seclusion. Oakleaf hydrangeas are summer bloomers with mostly white blooms, elegant oakleaf-shaped leaves, and lovely peeling bark.
Hydrangea anomala ssp. petiolaris is another choice for full shade. This climbing species, which has lacy, white blossoms in the summer, can reach a height of 50 feet if it is given adequate support. The foliage is a rich shade of green and would look wonderful growing up a tree trunk or covering the face of a building. It would also look lovely covering the roof of a garden shed.
Full shade cultivars require the same upkeep as partial shade. In the deeper shade, it will be especially crucial to keep the plants free of leaf litter and with excellent airflow. Water your plant once a week after it has become established. Keep a watch on the leaves, and if you notice any drooping, especially during the hot summer months, water them right away. The importance of this increases in hotter regions.
These leaves’ unique shape would be a lovely complement to Hosta leaves. The white blossoms would contrast nicely with the lighter hues of your shady blooms and provide some brilliant brightness to your shaded locations.
Shade Varieties
There are a few different hydrangea cultivars that thrive in the shade. Some types can even thrive in zones 3 (which doesn’t warm up until later in the spring), which is one of the coldest growing regions. Let’s examine some of the best shade selections!
Hydrangea quercifolia ‘Snow queen’
The movie “Snow queen” is stunning. The flowers are stunning, as they are with all hydrangeas. These rose blush-colored blossoms appear in the middle of summer. The foliage of this plant is my favorite component. The leaves begin the season in a very deep green, gradually changing to a deep reddish bronze color, and finally finishing in that shade, offering a stunning splash of color to your fall landscape.
Hydrangea quercifolia ‘Alice’
With a height ranging between 12 and 15 feet, this Oakleaf Hydrangea is one among the biggest. In the summer, this plant blooms with incredibly deep cream-colored flowers. A woodland garden would be a truly lovely place for “Alice.” This cultivar would look especially beautiful if it were grown as a bordering hedge.
Hydrangea arborescens ‘Annabelle’
‘Annabelle’ enjoys partial shade and has some of the largest flowers in the hydrangea family (12 inches wide!). These enormous blossoms can be supported all season long by the sturdy stalks. This shrub can grow up to five feet tall and five feet broad, so give it plenty of area to expand. These enormous, all-white blossoms bloom for a long time.
In a mass planting, as a specimen shrub, or as a foundation planting, “Annabelle” would look lovely. These bushes should still be included in your cutting garden. Imagine a bunch of flowers that large! Wow!
Is the sunlight too much for my hydrangea?
Hydrangeas do not thrive in the sweltering heat of the day. Hydrangeas can benefit from afternoon shade by avoiding the damaging effects of too much sun. Give your hydrangeas at least three hours of direct sunlight each day. Leaf scorch or wilting might result from too much midday sun.
Can hydrangeas be overfed?
With their huge, lengthy blooms and range of colors, hydrangeas have a romantic elegance that harkens back to bygone eras. They are plants that will really enhance your landscape. Some of them are well renowned for their capacity to change color depending to the acidity levels of the soil and have become a great favorite across gardens in the U.K. Some of them will flower from summer all the way through to October.
Choosing Your Hydrangea And Where To Plant Them
There are many different hydrangea kinds, with the Bigleaf being one of the most popular. You may have heard of or seen the Mophead and Lacecap Bigleaf kinds, which are the ones that are recognized for changing color. Before you start planting, it’s important to spend some time learning about the different types and what they want in terms of growing circumstances. Other variations include the Climbing Hydrangea.
Although some will handle greater shadow, most hydrangeas like early sunlight and light shade in the afternoon. Remember that blue blooms are more likely to appear in soil with a pH below 5.5, so if you don’t want that, you may need to adjust the acidity levels in your garden. However, if blue blossoms are your heart’s desire, you might still need to add a bluing chemical even with the proper acidity to guarantee you receive the blooms you want.
Always choose a location after thoroughly preparing the soil by adding lots of compost, making sure it’s well-drained, and making sure it retains moisture. You’ll need to add a lot of well-rotted manure or peat if your land is sandy.
Caring For Your Hydrangeas
Your hydrangeas will need a lot of water during the first few years and most definitely during a dry season. If they are too dry, you’ll see them wilt. In gardens with inadequate soil, hydrangeas frequently suffer. In light of this, you might also need to mulch in the fall and feed your plants once a year in the winter or early spring. But be careful not to overfeed your plants.
Pruning Your Hydrangeas
Hydrangea pruning seems to stir some debate, but it is important to know what variety you have if you want to do it correctly. With Mopheads, you should hold off on deadheading the blooms and trimming back to the new bud until late winter or early spring. This is due to the dead blooms protecting the flower buds for the following year. On the other hand, climbing types and lacecaps can also be pruned after flowering.
Pruning back the older shoots after your hydrangea has established itself will aid in promoting new growth. Cut the entire hydrangea hardback to a height of around 15 cm above the base if you notice that it has become somewhat straggly and is producing lesser flowers. However, keep in mind that since your hydrangeas flower on a second year’s growth, it will take some time for them to do so following this type of pruning.
Can I Grow Hydrangeas In A Container?
Hydrangeas can be grown in containers, though certain kinds will do better than others and will require a bit more attention. The most important thing to keep in mind with your pot-grown hydrangea is that you’ll need to check the soil every day to make sure it stays moist and isn’t getting too dry.
They’ll need to be fed perhaps once or twice a year, but not more than that because over feeding might be harmful. Your hydrangea will likely need to be replanted every year or two because they may quickly outgrow a container.
Many of us remember our grandparents planting hydrangeas or a special location where we remember seeing them bloom when we were young. Perhaps a breathtaking display of their wonderful flowers has stopped you in your tracks? If you have any memories or have any pictures, please share them with us. Join us in sharing it on our social media platforms. We anticipate seeing a few of your blossoms.