This traditional favorite is a must-have in any garden, and new cultivars have made hydrangea cultivation simpler than ever.
Generally speaking, blue or lavender-blue hydrangea flowers are produced by acidic soil, which has a pH lower than 6.0. Pinks and reds are encouraged by alkaline soil, which has a pH above 7.0. The blossoms turn purple or bluish-pink at a pH of 6 to 7.
Add aluminum sulfate or garden sulfur to your soil to reduce pH levels. Use ground lime to increase the pH. To ensure that the pH of your soil is within the desired range, retest it according to the instructions on the product you’re using.
Do all hydrangeas have a soil-related color change?
The pH of the soil affects the color of hydrangeas. While most other colors will change, white hydrangeas won’t. The color of the flowers will be pinker in more alkaline soil, while redder blossoms may occasionally appear in severely acidic soil. Your flowers will be bluer the more acidic the soil is.
Does hydrangea vary with soil?
A gardener from Lincolnton, Georgia, where I was raised, asked me my first inquiry as the agricultural and natural resource Extension agent for Columbia County. Her springtime planting of pink hydrangeas turned blue blossoms by the time summer rolled around.
She knew how important it was to add lime to the soil to change the pH level and, in turn, the hydrangeas’ color. She required details regarding the type of lime and application technique, though.
The greatest gardening starts with a soil sample, as any representative from the University of Georgia Cooperative Extension will inform you. Knowing the nutrients and pH level of the soil from a soil sample takes the guesswork out of how much lime or fertilizer is required.
At a pH of 6 to 6.5, the majority of important plant nutrients are easier to obtain. Plants may be unable to take up nutrients from the soil if the pH is either too high or too low. Because of the chemistry of the soil, the plant cannot access or absorb the nutrients. Numerous symptoms can accompany this issue, but in the case of hydrangeas, the bloom color alters.
The presence or lack of aluminum compounds in hydrangea flowers causes color variance. Blue color indicates the presence of aluminum. When present in modest amounts, the color might range from pink to blue. The blossoms are pink if there is no metal present.
Because soil pH affects the availability of aluminum in the soil, flowers’ colors are indirectly affected. Blue flowers are produced when the soil is acidic (pH 5.5 or below), as aluminum is more readily available to the roots.
Because Georgia’s soils tend to be acidic, the majority of hydrangea flowers are blue. Aluminum is less available in soil that has a pH of 7.0 or above, which is considered to be alkaline. Usually pink, the blooms in this soil are.
I advised my gardeners to spread one cup of dolomitic lime over ten square feet of soil and water it in to restore the hydrangeas to their former pink color. However, it can take a year using this technique to detect a noticeable improvement in blossom color.
By soaking the soil in liquid, changes can be made more quickly. In one gallon of water, dissolve one spoonful of hydrated lime. In March, April, and May, soak the surrounding soil with the solution. The solution should not be applied on the leaves as it may harm them.
There are numerous brands that sell dolomitic limes, including Pennington, Greenacres, Lilly Miller, and Green Earth, among others. Additionally, there are numerous hydrated lime product brands available, including Hi-Yield, Bonide, Hoffman, and Lees. All are wise decisions.
Although homeowners in Georgia frequently deal with acidic soil, alkaline soils do exist. Distribute half a cup of wettable sulfur per 10 square feet and water it in to gradually turn pink flowers blue.
Again, liquid soil drenches are a quicker approach to effect the transformation. In the months of March, April, and May, saturate the soil around the plant with a solution of one tablespoon of aluminum sulfate in one gallon of water. Make sure to keep the solution off of the leaves.
If you want to plant hydrangeas in fall, you need first improve the soil where you plan to do so. Apply 50 pounds of decomposed organic material per 10 square feet and thoroughly work it with a tiller or shovel into the top 8 to 12 inches of soil.
Create a hole for the plant that is twice as large as the root ball. Avoid planting too deeply. Make sure the root ball’s top is parallel to or just above the soil’s surface. After planting, give the area plenty of water and add 3 to 5 inches of mulch.
Throughout the growing season, hydrangeas react to numerous sparing doses of fertilizer. They are thirsty plants that work best in landscape zones with modest water use.
Is it possible to modify the hue of every hydrangea?
A hydrangea’s color can fluctuate drastically, and occasionally, they even display various colors on the same bush. Ulrich Doering/Alamy Stock Photo provided the image.
Only certain hydrangea species, primarily those related to H. macrophylla or H. serrata, can change the color of their flowers. The typical belief is that soil pH and flower color are connected. Although the quantity of aluminum a plant can access in the soil—which is governed by pH and phosphate levels—determines the color, as Michael Dirr describes in his book Hydrangeas for American Gardens.
Unless phosphorus levels are high, a lower pH permits aluminum to be soluble and absorbed by plants, and blue flowers are more common. Aluminum is locked up at a higher pH, and pink flowers are more common. When blossoms first open, shades of cream to green are also visible, and as flowers get older, the tones might alter.
How can acidic soil be created for hydrangeas?
Like coffee itself, coffee grounds have an acidic pH. The acidity of the soil around hydrangeas is increased by mixing in dried coffee grounds, which enhances the hydrangea’s capacity to produce blue and its capacity to absorb aluminum from the soil. With a pH test kit, track the soil’s pH over time; a range of 5.2 to 5.5 is ideal for blue flowers. Coffee grinds occasionally scattered on the soil’s surface or placed there will slightly raise the acidity level.
What should the soil include to turn hydrangeas pink?
How many of you can recall the argument between the fairy godmothers in Walt Disney’s Sleeping Beauty about the color of the princess’ ballgown? Every time the traditional mophead hydrangeas (Hydrangea macrophylla) bloom in June, I recall that scene. The colors are the stuff of enchantment because they are so vibrant.
Aluminum, not a fairy godmother, controls the color of this hydrangea’s blossoms, whether they are pink or blue. Lack of metal results in pink blossoms, whereas an abundance of aluminum results in blue flowers.
For pink blooms, add lime to the soil; for blue blooms, add aluminum sulfate. The soil composition determines the required amount of lime or aluminum sulfate.
If you are adamant that your hydrangea will be pink or blue, plant it in a container where the pH of the soil may be easily controlled.
What can I do to turn my hydrangeas red?
If you only want faint red hydrangea flowers, try increasing the soil’s alkalinity and watching how dark the pink gets. It operates as follows: A pH scale from 0 to 14 is used to gauge the acidity of soil. A pH of 7 denotes a neutral soil. Any soil with a pH below 7 is acidic, whereas soil with a pH above 7 is alkaline.
How can I maintain a blue hydrangea?
Even though the growing medium begins out being free of lime, repeated watering in places with hard water tends to make it more alkaline. Vitax Hydrangea Colourant, a powder containing aluminum that you can mix with the growing medium when you plant, should be used to ensure that your hydrangea stays truly blue.
What shade of color do hydrangeas have in acidic soil?
The color of some hydrangeas’ blossoms reflects the degree to which they are sensitive to the pH of the soil in which they are grown. Over the years, the majority of French hydrangeas (Hydrangea macrophylla) have evolved this sensitivity. Their blossoms will be blue on soil with a pH below 6, which is acidic. Their blossoms will be pink or perhaps red in alkaline soil (pH above 7). These hydrangeas can have purple blooms or even a combination of pink and blue blooms on the same plant in neutral to slightly acidic soil.
Naturally, there are some exceptions to this rule as there are to every rule. No of the pH of the soil, white-blossomed hydrangeas will always bloom in that color. Certain cultivars maintain their color under all but the harshest circumstances. For instance, Ami Pasquier never truly turns blue, unless the soil is severely acidic, in which case it turns purple. Regardless of the pH of the soil, Purple Tiers doesn’t change color.
My hydrangeas turned green; why?
Blooms on green hydrangeas have a reason. Mother Nature, with a little assistance from the French gardeners who crossed the original Chinese hydrangea varieties. You see, those bright flowers aren’t even made of petals. They are sepals, the flower’s component that shields the flower bud. Why do green hydrangeas bloom? because the sepals naturally have that color. Colored hydrangea blossoms frequently turn green over time because as the sepals deteriorate, the pink, blue, or white pigments are swamped by the green.
Many gardeners think that the amount of aluminum in the soil is the only factor that affects color. You receive blue flowers from aluminum. Aluminum becomes pink when you bind it. Right? The narrative goes far deeper than that. With increasing daylight hours, the green hydrangea flowers begin to change color. Those colors are given the energy to dominate by light. Your hydrangea flowers may stay that hue for several weeks before turning green once more. The length of the days is reducing. The white, pink, and blue hues become less vibrant and disappear. Green hydrangea blossoms are in vogue once more.
Sometimes you can find hydrangeas with year-round green blossoms. You might have a variety called “Limelight” if you’re new to gardening or the plant is new to you and blooms later than its siblings. Despite having blooms that resemble mophead hydrangeas, these relatively new plants have considerably smaller leaves than the huge leaf types. This beauty’s flowers, which start and end in white but are bred to be green in between those times, change green naturally.
But if your hydrangea has green flowers and is one of the other varieties and the blooms won’t change, you’re the victim of one of Mother Nature’s sporadic tricks, and horticulturists have no idea why the condition exists. There has been no scientific explanation discovered, however it might be a mix of odd weather circumstances. Have courage. Only one or two seasons should pass before your green-flowered hydrangea recovers to normal health.
Why do green hydrangeas bloom? Why do green hydrangea blossoms occur? For the curious, they are intriguing questions, but are they ultimately relevant? If you notice the flowers on your hydrangeas turning green, take a seat, unwind, and take in the spectacle. Mother Nature is at her finest.
How can soil be made to be more acidic?
To ensure that the soil’s pH level is maintained throughout time, you may also put mulches made of pine needles or oak leaves around plants that prefer acidic environments.
These should very gradually and softly acidify the soil as they decompose in place.
Add a Mulch of Cottonseed Meal
Cottonseed meal is an additional mulch that you can use. If you reside in a place where cotton is produced, this could be an intriguing mulch option to consider.
However, it is advisable to avoid this if it did not originate from an organic farm if you have an organic garden and in general.
Use An Organic Liquid Feed on Your Garden
To provide acidity and give ericaceous plants a little boost, using an organic liquid feed like a compost tea produced from ericaceous compost may be helpful.
Use Acidifying Liquid Feeds Such as Vinegar/ Lemon etc. (In Moderation).
Finally, you can use another acidifying liquid feed to water your acid-loving plants in raised beds, containers, or pots.
Lemon juice, vinegar, and other acidic liquids can be added, but only in moderation. If you want to add vinegar, mix 1 cup vinegar with 1 gallon of water.
These can be used to nutrient-richly enhance acidity to the soil around ericaceous plants.
Where you do make adjustments, do so gradually and with tiny steps. No matter what type of soil you have, you should keep adding compost and organic matter to your garden to increase the quality of the soil.
What caused the pinking of my blue hydrangea?
Popular flowering garden shrubs like hydrangeas regularly confound us by altering the color of their flowers after they have been planted. And since the color change is probably a slow process, it can take a few years before you notice it has happened.
Can the color be changed back? is one of the first queries that a new student or client for landscape design makes. Is the hydrangea in trouble? is a different issue.
Will my Hydrangea die if it changes colour?
If the only problem is the color change of the blue to pink or pink and purple to blue blossoms, it is doubtful that your hydrangea is dying. Hydrangeas are often simple plants to maintain. As we’ll see below, your Hydrangea’s color change could have underlying factors that could ultimately harm the shrub’s general health.
Why has my Blue Hydrangea turned Pink?
After being brought home and planted in the garden, not all hydrangea varieties will change the color of their flowers. The soil determines whether they do.
The bushes that are most frequently seen in gardens are hydrangea macrophylla, also referred to as mop-head hydrangeas. Due to the rounded flower balls on them, they are known as mop heads. Lace cap hydrangeas, in contrast, have smaller, fertile flowers that are encircled by bigger, sterile sepals.
These two hydrangea kinds will almost certainly change color depending on the pH of your soil. With a pH meter or test kit from a garden center, you can quickly determine how acidic or alkaline your garden soil is. Also see the blogs listed below.
The impact this has on the levels of aluminum in the soil, rather than just the acidity of the soil, is the real cause. Aluminum levels rise with soil acidity, turning pink and purple hydrangeas blue as a result. The blue flowered should persist on soil with a pH of 6 or lower.
If you want to be sure of retaining the blossom color, the tip is to check the soil pH before you buy a mop-head or lace cap Hydrangea.
How do I Keep my Blue Hydrangea Blue?
Alternately, place your mop-head hydrangeas in a peat-free ericaceous compost-filled ericaceous bed. Rhododendrons, azaleas, and your hydrangeas might all be planted together. A floral display from April to October can be expected if you group all the acid-loving plants together.
How do I Keep my Pink Hydrangea Pink?
by having soil that is alkaline, or has a pH of 7 or above. An acceptable pH range of 6.57 should be achieved; cover with compost made from used mushrooms to help keep the soil alkaline.
Why not grow your hydrangeas in containers if your soil is acidic? One on each side of your entrance door might look really attractive.
What about my Purple flowered Hydrangea?
A good query! I’m not sure I can readily respond to that question because it depends not just on the soil but also on the shrub’s ancestry. Because of this, some purple hydrangea blossoms do not turn pink when planted in acidic soil.
Why has my Blue Hydrangea turned PinkMore Solutions to the Problem
Why not buy a Hydrangea that won’t change color when planted to make your life easy from the start? Not all hydrangeas exhibit the same tendency for blossom color change.
For instance, even in macrophylla cultivars, white and green flowering variations have a tendency to remain the same color.
Hydrangea petiolaris
Likewise called the climbing hydrangea. It is a robust, self-clinging climbing shrub that is cultivated for its heads of white flowers.
It takes time to establish itself, but once it does, it can grow vigorously and may need to be pruned if you don’t want it to cling to your gutters!
Dark green foliage changes to butter yellow in the fall before wintering as a tracery of branches. The young twigs have a lovely reddish brown sheen.
HydrangeaPruning Tips
It’s not just about the reason why your blue hydrangea turned pink, of course. You could be perplexed as to why there aren’t any flowers at all despite pruning the bush.
Although hydrangeas don’t need much trimming, adopting a strategy that promotes new wood will keep them from being too woody. Continue reading to make sure you pruned your shrub correctly for its type.
Between February and early March, you can prune a lot of summer-flowering deciduous shrubs, typically those that bloom on the growth of the current year. One hydrangea that has to be pruned frequently is hydrangea paniculata.
On the wood from the previous year, mop-head hydrangeas bloom. If you live in a mild climate, you can deadhead by cutting back to a strong pair of shoots as early as late February, or you can wait until March.
What next?
Now that we know the reason why the blue hydrangea turned pink, we can determine which blossom colors are still the same as when you first acquired the plant.
You might like to look for and follow us on your favorite social networking platform.
Follow us on Instagram, Facebook, and Pinterest for more gardening inspiration.
Get in touch if you’d like a design visit, either in person or virtually, to include lots of beautiful hydrangeas in your garden.
You can get Garden Design & Planting Designs from Plews.
Or maybe you’d rather take gardening classes in your own yard? Where else would you discover information that is pertinent to you as a gardener? Plews Gardening Courses & Lessons are personalized for you and your garden and mix practical confidence-building exercises with important “why we do this” justifications.
Gardens to visit with Hydrangeas
The Holehird Gardens, home of the Lakeland Horticultural Society, includes a Hydrangea walk with more than 300 species if you’d like to take in hydrangeas in their entirety. In July and August, this is the place to go if you’re still not convinced about the beauty of hydrangeas because you’re likely to locate one for your own yard. Check out a description of one of my visits in the list of blogs below.
Even though they don’t have the same diversity of species as those available at Holehird, other locations of the UK with acidic soil frequently have attractive displays of hydrangeas. One particularly evocative example is the shady drive at Portmeirion, which has lighting Hydrangea plants tracing your path. There are more gardens worth seeing on the west coast of Scotland, in Ireland, and in Cornwall.
Visit Plews Potting Shed blogs, such as the ones below and our monthly Tipsheet, for additional gardening guidance and inspiration.
We’re also on Facebook, Pinterest, Instagram, and other social media.