If you are looking to grow hydrangeas, it’s important to understand the basics of hydrangea care to get the most out of their flowers. Here’s what you need to know.
Hydrangeas are the most asked about plant in the garden.
They grow the prettiest flowers, don’t they?
I’m a huge fan of hydrangeas and love to grow several different varieties.
Some years, my hydrangeas struggled to bloom.
While other years, they bloomed like crazy.
And sometimes, hydrangeas take a few years after planting to establish before they even start blooming.
So how do we get the most out of our hydrangeas?
Follow these simple tips.
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In general, hydrangeas have a USDA hardiness zone of 4-9 depending on the variety you have.
Hydrangeas are easy-care flowers with a range of colors that include blues, purples, pinks, whites, and chartreuse.
There are lots of different varieties to choose from.
Some are bred to rebloom.
While others will bloom once and be done until the following season.
It’s helpful to know what varieties you have in your landscape because that will drive how you care for them.
Hydrangea Care Basics
There are several factors that go into properly caring for hydrangeas.
Understanding their needs will help you better care for your hydrangea plants and get the most out of their blooms.
Plant Hydrangeas in the Proper Location
In general, hydrangeas prefer shadier spots where they receive morning sun and afternoon shade.
However, there are some varieties that can handle more sunlight.
So it’s important to read the plant tag to see what kind of light conditions your hydrangea needs.
When planting hydrangeas, it’s best to do it in early spring or fall.
Avoid planting in the hot summer months because they don’t acclimate as well and require a lot more care than you’ll want to do.
To relocate an established hydrangea, move it during spring or fall.
And with that, I prefer fall when the temperatures cool down or early spring before it leaves out.
Always test your soil before planting so you know what’s in it and how to improve it.
You can buy a test kit like THIS but I advise going through your local cooperative extenstion.
That said, hydrangeas prefer well-draining and rich soil with lots of organic matter.
Peat moss and bark are better amendments than animal manure, because animal manure is high in nitrogen and can affect flowering.
However, manure that is well-aged is OK to use.
It’s important to understand the drainage because hydrangeas do not like wet feet.
You’ll know it’s getting too much water when the leaves have brown edges or drop.
Alternatively, if hydrangeas receive too little water, they will let you know through droopy leaves that revive shortly after watering.
How to Plant a Hydrangea
- Determine the right planting location by selecting an area with fertile soil and ample room for the shrub to grow. Consider what the overall size will be and understand the light conditions of the spot.
- Dig a hole 2x the size of the root ball.
- Prepare the hole and amend the soil if necessary to improve drainage.
- Remove the plant from the nursery container, loosen roots, and plant at the same depth as the pot.
- Back fill with garden soil. If soil needs improvement, back fill with high quality garden soil and compost.
- Spread organic mulch to help retain moisture and improve the quality of the soil over time.
- Bottom water to thoroughly and keep the plant hydrated but avoid over-saturating the plant so it doesn’t sit in water either.
If you want to make your own compost to use with your hydrangeas, here is a great compost recipe!
Pest and Disease Problems
In general, hydrangeas are pretty easy going, but sometimes they can have issues.
Hydrangeas that are planted in too shady of an area that receives a lot of water or has poor drainage, powdery mildew and blackspot are common.
If you notice powdery mildew or blackspot, relocate the hydrangea to a sunnier location with better drainage in spring or fall.
In the alternative, when a hydrangea receives too much sun and watering from overhead, you may see signs of rust spot on the foliage.
This can be corrected by watering more at the base in the early morning or late afternoon.
Drip irrigation systems are perfect for this when there isn’t much rain.
And if the hydrangea is getting too much sun? Relocate it a slightly shadier spot in spring or fall.
Pest problems include slugs and snails. If you see holes on the foliage, try using organic slug and snail bait like THIS.
In general, hydrangeas do not need to be fertilized.
Instead, I recommend amending the soil with good quality organic matter.
If hydrangeas are planted closely to grass and you fertilize your grass, keep an eye on the blooms.
Because grass fertilizer is high in nitrogen and affects hydrangea blooms if it’s fed too close to plants.
Nitrogen makes plants greener and more lush.
So hydrangeas will not flower as much, if at all if, it receives too much nitrogen.
How to Change the Hydrangea Flower Color
Hydrangeas are sensitive to pH in the soil.
Testing the soil will tell you the pH of your soil.
But you can also tell from the color of your hydrangea flowers.
With the exception of white flowering varieties, acidic soil conditions cause flowers to be more blue or purple.
A favorite of mine.
When you see blue or purple flowers, soil pH is generally 6 or lower.
If you want to increase the acidity, only try it with well-established plants.
And you would do this, by amending the soil with sulfates, like coffee grounds.
Alternatively, more neutral soils generally produce flowers that are pink or red.
In general, when you see pink or red flowers, soil pH is around a 6-7.5 pH.
To increase the alkaline in your soil, add garden lime.
Soil tests will typically provide guidance on ways to improve garden soil.
So I always recommend testing it.
As an aside, I don’t play around with the flower color and don’t really recommend doing it.
I prefer my plants do what they want in the environment that they are in.
Because I believe plants do better if we don’t mess with them so much and just leave them be providing the general care they need to thrive.
Pruning hydrangeas is a popular question among my readers.
Knowing when and how to prune it, is really important so your plant flowers.
Therefore, it’s even more important to know what type of hydrangea you have so you know when to prune it.
There are three different pruning categories that depend on whether the plant blooms on old or new wood. They are:
- Hydrangea Macrophylla which blooms on old wood
- Hydrangea Arborescens and Hydrangea Paniculata which blooms on new growth
- Everblooming/Endless Summer Hydrangeas which blooms on both old and new wood
Everblooming and Macrophylla Hydrangeas that bloom on old wood should be pruned when flowers start to fade.
If cut back between fall and early spring, they won’t flower because the buds were trimmed off.
Hydrangeas that bloom on new growth should be cut back in late winter or early spring.
I cut my Hydrangea Paniculata back hard the first seasonable day in early spring and it blooms beautifully every fall.
Thus, timing is critical!
And if you are not sure what variety you have, reach out to your local cooperative extension or master gardener program and ask them to ID the plant for you.
The local cooperative extension and master gardeners are a great resource for home gardeners.
How to Prune a Hydrangea
Now that we understand when to prune a hydrangea, how do we prune it?
Find a budding node and cut it on a 45-degree angle about half an inch to 1” above it.
This is where new leaves and blooms will grow from.
When you notice completely woody branches on established hydrangeas, cut these branches to the ground to promote new growth at the base.
I typically wait until the whole plant is lush and green before cutting these particular branches back so I know they are really dead.
But in general, aside from my hydrangea paniculatas, I don’t prune my hydrangeas much at all and let them be.
When I cut flowers for arrangements or decor, I make the cuts the way I mentioned above.
But in general, I leave them alone unless I need to control the overall size.
Click here for more information about pruning.
Drying Hydrangea Flowers
If you want to dry hydrangea flowers for decor, wait until the blooms have a vintage papery look which is typically 6-8 weeks after it starts flowering.
Fresh flowering hydrangeas do not dry well, so wait.
Click here to dry a hydrangea the easy way.
Fresh Cut Hydrangea Care
If you want to enjoy fresh-cut hydrangea flowers indoors, wait until the flowers are completely open before cutting them.
Always cut in the mornings and remove all the leaves from the stem to ensure it retains as much moisture as possible.
And follow these tips to prevent hydrangeas from drooping in the vase.
Want to Learn More About Hydrangeas Care?
- The Complete Guide to Hydrangea Care and Their Flowers
- How to Divide Hydrangeas
- How to Propagate Hydrangeas
- Why Are My Hydrangeas Not Blooming?
- The Ultimate Guide to Keeping Fresh Cut Hydrangeas From Drooping
- How to Dry a Hydrangea the Easy Way
- Are Hydrangeas Deer Resistant?
- How to Make a Hydrangea Wreath for Free
- How to Prune Hydrangeas
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