hydrangea plants

Hydrangea Companion Plants: What to Grow With It

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The hydrangea is a garden staple – and if you’re considering growing hydrangea companion plants, that’s a wise choice.

There are certain plants that, when grown next to hydrangea bushes, benefit from similar growing conditions and offer similar visual appeal. Not only that, but hydrangeas offer various advantages to plants growing nearby.

If you’re wondering what to plant next to hydrangeas, here’s what you need to know:

Are Hydrangeas Poisonous to Other Plants?

There is a misconception out there that hydrangeas are poisonous to other plants, and therefore, that you need to select companion plants carefully to make sure you don’t accidentally kill the rest of your garden. However, that is not the case. 

These shrubs can be dangerous – but not to other plants. Instead, they can actually be dangerous to you. They contain a toxic compound in their stems, leaves, and flowers. This compound is known as hydrangin, which converts to cyanide in the digestive system and can lead to serious stomach upset. 

Poisoning is rare in humans but can occur in pets and small children when large amounts are ingested. Therefore, it’s a good idea to choose your hydrangea planting location wisely – but only in terms of where animals and kids can get to your shrubs (and not necessarily based on the surrounding plants). 

What to Plant with Hydrangeas

There are a few companion plants you may want to consider growing with your favorite flowering shrubs.

One good option is American beautyberry. A fast-growing shrub, it thrives in the same conditions as hydrangeas. Plus, its beautiful purple berries add additional interest and can attract wildlife to your hydrangea garden.

Lacy, delicate ferns also grow well with hydrangeas, as do hostas. These species prefer a bit more shade, but since they’re often smaller than hydrangeas, can thrive in their shadows. 

Medium-sized trees grow well with hydrangea plants and offer the benefit of additional shade during hot weather. Dogwood and other ornamental trees can help keep your hydrangea cool while also providing visual appeal in their blossoms, bark, and foliage. 

Finally, you may want to grow a few shade-tolerant flowers in front of your shrubs. These can often fix nutrients in the soil while benefiting from the shade of your taller shrubs. Pansies, heuchera, and foxgloves are all excellent choices. 

Other great plants that look good with hydrangeas include:

You can even grow ornamental grasses or annuals with your hydrangeas to really shake things up!

Tips for Selecting Hydrangea Companion Plants

Here are some tips to consider when you’re choosing companion plants that will not only grow well with your hydrangea shrubs but will create an ornate display in your landscape.

1. Ideal Growing Conditions

Consider the preferences of your hydrangeas when you’re trying to decide where you will plant them. Some varieties, like mophead (Hydrangea macrophylla), produce blue blooms in acidic soil and pink ones in alkaline soil.

Most hydrangeas like full sunlight in the morning with a bit of dappled shade in the afternoon. ALmost all like soil that is consistently moist, though not soggy. Oakleaf hydrangea bushes prefer soil that is rich and moist. 

It’s important to consult the label on your plant before you put it in the ground (and before you select companions). That way, you can make sure the ideal conditions will be provided. 

2. Consider the Canopy

Start by selecting canopy plants that will give a bit of shade to your hydrangea bushes. Medium-height trees like dogwood can deliver a bit of shade while also providing their own visual appeal in their foliage, flowers, and bark. 

Other good options include evergreens, crape myrtles, and more. 

3. Plant a Mixture of Deciduous and Evergreen Plants

Don’t be afraid to shake things up when you’re planning out your hydrangea-centric landscape. When combined, evergreen and deciduous shrubs create an interesting aesthetic – plus, you’ll have some foliage left to enjoy in the winter, too. 

Pairing plants like yew, mahonia, and others will ensure that you have something to look at throughout all seasons! 

4. Grow a Carpet

Last but not least, don’t forget to include the plants that will be grown at your hydrangeas’ feet. You may want to add groundcovers like loropetalum or heuchera. These will lend some elegance to your garden while also suppressing weeds and helping to retain moisture around your shrubs.

Where Should You Not Plant Hydrangeas?

For the most part, you can plant hydrangea shrubs just about anywhere as long as the location has fertile soil and receives a bit of morning sun paired with afternoon shade. Avoid planting your shrubs in areas that receive deep shade or shade most of the day  – or on the flip side, total sun all day.

There aren’t many plants that don’t grow well with hydrangea bushes (with the exception of those that prefer opposing growing conditions, such as full shade, full sun, or dry soil). You may want to avoid options like lavender, periwinkle, or rosemary, for example.

Otherwise, you have thousands of choices when it comes to finding the perfect plants to grow alongside limelight hydrangeas and other types. You can choose freely based on your visual preferences, landscape, and growing zone. Happy planting!

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