How to Grow Spiraea Shrubs & Care Guide

Spiraea bushes are a favourite of both inexperienced and seasoned gardeners due to their striking appearance, rapid growth, extreme durability, and low maintenance requirements.

The deciduous shrub genus Spirea includes two distinct groups: those that flower in the spring and those that bloom in the summer.

White flowers emerge in huge clusters on arching branches of the spirea in the spring.

Beautiful pink, white, or crimson flowers sit atop stiff stems on the spirea bush during the summer.

The form and blossoms of both species make them highly desirable.

How Do I Grow Spirea?

Spirea shrubs are incredibly simple to cultivate, and their adaptability means they may thrive in virtually any climate.

You can find spirea shrubs at any garden centre or greenhouse, and it’s ideal to plant them in the early spring or late fall for optimal growth.

Spirea bushes, depending on species, can reach heights between 0.5 and 2 metres.

Make sure you have enough room for your bush when it grows up.

Spirea bushes can either stand alone as a focal point or be part of a larger collection to serve as a screen or border.

Spirea Growing Conditions

Planting a spirea bush in either direct sunlight or partial shade will yield the best results.

In full shade, the shrub will not grow as tall and will produce fewer, smaller flowers.

Spirea prefers to not have their feet in the water, so be sure you plant them somewhere with good drainage.

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How to Care for Spirea Bushes

Spiraea requires little attention when it has been established. Mulch around the plant’s base helps retain moisture, and consistent watering throughout the summer ensures the plant grows and blooms healthily.

Spiraea bushes, which blossom in the summer, should be pruned in the winter or spring.

Plants that bloom in the spring can be trimmed soon after their blossoms have faded. Get rid of the old wood and cut back the spring variety’ canes to the ground.

Though aphids can become a nuisance, they are usually not severe enough to require treatment.

The spirea shrubs you select to cultivate will enhance the look of your yard for years to come, no matter which variety you pick.


Pruning out dead or diseased branches is essential for the health of any spiraea plant. Don’t remove more than five buds from each stem while pruning.

Start thinning down the branches in the middle of the plant to increase airflow. Eliminate any unwanted suckers and give the plant a good trimming.

If you want your plant to look its best, wait to prune it until after it has completed blooming for the season.

Propagating Spiraea

Softwood cuttings, hardwood cuttings, and ground layering are the three surefire ways to spread spiraea.

Cut 10–12-inch-long, healthy stems from your softwood when taking a cutting.

First, you’ll need to prune off the plant’s lower leaves before you can plant the cutting in rooting hormone.

Then, you may place four or five cuttings into a pot of soil that’s been moistened but still has good drainage.

Keep the soil moist by checking on the cuttings every so often and placing the plastic bag in a spot with dappled sunlight. In approximately a month, you should see fresh growth.

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Hardwood cuttings should only be taken in the winter when the tree is dormant.

Remove the lower leaves and cut the upper leaves back to just above a leaf node. Plant the cutting four to six inches deep.

Don’t forget to water the soil, and come spring, you should see new shoots from your cuttings.

Finally, when ground layering spiraea, select a long stem that can bend to the ground’s surface without breaking. Don’t detach it from the main plant.

Take off the foliage and scrape the stem to make some room. Only the bottom three inches of the stem should be treated, though.

To do this, dig a tiny trench underneath the plant, approximately an inch deep, and gently bend the stem so that the scraped portion rests in the trench.

Fasten the base of the stem to the ground with a pin so it won’t topple over.

Putting it in the ground, watering it gently, and waiting a few months should help it set down roots.

Once it has, it can be moved to a new location for transplant.

How to Grow Spiraea From Seed

During the early spring, you can germinate spiraea seeds by placing them on a damp paper towel and keeping them in a dark place.

When they are ready, transplant them to 12-inch pots, being careful to follow the specific care recommendations for your spiraea variety as indicated on the seed packaging.

Once you’ve finished planting, cover the container with plastic and place it in direct sunlight.

Assuming ideal conditions, the seedlings should emerge after a few weeks.

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It is recommended to leave the spiraea in the container for at least a year to ensure they are sufficiently hardy.

Potting and Repotting Spirea

Dig a hole twice as broad as the container or rootball and the same depth as recommended by standard shrub planting standards.

A two- or three-inch layer of mulch should cover the area from the hole’s centre to the drip line. Avoid having the mulch touch the stems of the bush. It is important to consider the final size of a cluster before planting.


Spiraea shrubs, once established, can normally survive the winter without any problems.

Water the soil well a week before the first frost, and then apply a thick layer of mulch once the temperatures have dropped to help them along.

Common Pests and Plant Diseases

Your spiraea shrubs may be infested with aphids and spider mites.

A strong spray of water or horticultural oil will fix these problems.

Powdery mildew could be an issue if the plants aren’t getting enough light. Fungicides are a viable solution to this issue.

How to Get Spirea to Bloom

It may take a fresh spiraea a season or two to get its roots established before it begins to produce flowers.

If that isn’t it, then you may be overwatering your plant, which can be disastrous.

Deadheading flowers and adequately spacing bushes will promote new blooms and healthy growth. Light fertilisation once a year is also recommended.

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