Sumo Gardener

Tips on How and When to Prune Spirea

Are you wondering on how and when to prune spirea that is growing in your beautiful garden?

If this is your first time pruning them, then knowing how and when to do this is essential.

In this way, you won’t be able to damage it and such.


What are Spirea Shrubs?

What are Spirea Shrubs?

The spirea shrubs are one of the gorgeous bushes that can produce flowers and can help brighten up your garden.

They usually bloom during the summer and spring season, though there are also some that have the ability to produce leaf displays that are attractive during the fall season.

Having a spirea in your garden does not mean that you need to maintain it often because one of the only things that you need to do is to prune it.

Why Pruning is Needed for Spirea?

Before we get to it, it would be best to understand the reason why people should prune their spirea. In fact, there are a lot of reasons as to why pruning is important for your spirea.

One is it will help you maintain the height that it has and spread the shrub evenly. The shape will also be preserved, which means that it will remain attractive for a long period of time.

Another reason for pruning is to remove the damaged or diseased branches or any growth that it already dead.

If you see any of these problems, you need to make sure to prune them no matter what time of the year it is.

Pruning will also encourage the growth of another flower and lastly, it will remove and prevent the spreading of the plant.

When to Prune Spirea Shrubs?

Water Spirea regularly to promote growth and blooms

Depending on the type of spirea, most of the types of spirea can be pruned once they start flowering.

Some of the varieties of spirea that can be pruned after the flowering process are Spirea Japonica, Spirea Little Princess, Spirea Snowmound, and Spirea Arguta. 

The best way that you can trim the spirea is during the last season of growing. You can start choosing the oldest one to help open the shrub up.

There are also some that should be pruned at the start of the growing season, typically, during the spring season.

If you want to have a lot of new growth and a lot of flowers, then it would be best to trim the spirea during the early days of spring. You can start removing a lot of the old growth.

Typically some Spirea varieties can handle severe trimming rejuvenation during the early spring as this is the time when the buds are already swelling.

How to Trim Spirea Easily

Sharp and Clean Shears

When trimming Spirea, the shears should be cleaned, and it needs to be well sharp

When trimming, the shears that will be used for cutting should be cleaned, and it needs to be well sharp. The reason behind this is because diseases might spread along the plant, which you don’t want to happen.

The shears should be cleaned using a solution of bleach and water, as these things will help them be disinfected.

Trimming the Tips

The first thing that you need to do is to cut the tip of the spirea after you see the flowers. It would be best to trim the tips of the stem, which is usually at the topmost part of the bud on each of the stems.

As you are trimming, it would be best to maintain the shrub’s shape. You also need to make sure to trim the ones that are already dead, as this will help encourage the growth of a new bud.

Trimming Shoots that are Overgrown

The next thing that you need to do is to start trimming the shoots that are overgrown during the summer season to ensure that the shape of the shrub will be maintained. If possible, it would be best to trim within one-fourth inch of the bud or the leaf.

The trimmed spirea can grow a new stem, which will be capable of the flowering back

Another this that you need to do is to start trimming the spireas that have overgrown. You also need to trim the ones that have stems that are lower or are starting to fall.

Each stem should be cut back by 8 to 12 inches off of the ground. During the spring season, the trimmed spirea can grow a new stem, which will be capable of the flowering back.

Trim Dead or Damaged Wood

Trim the Damaged or dead stems of the Spirea immediately

Lastly, it would be best to check your spirea during the winter season if there are damaged or dead stems. Once you see one, it would be best to trim them immediately.

These are the tips on when to trim and how you can trim your spirea bushes. Of course, it would be best to know how you can take care of them as well. Below are a few tips on how you can do this.

Tips on How to take care of Spirea

Adding Mulch Around Spirea

Once you have planted your spirea, you need to add some mulch around it as this will help the moisture to be retained. You can use different types of mulch and the more natural the mulch, the better.

Watering Your Spirea

Of course, it would be best to water your spirea regularly, especially during the summer season. This will help your spirea to promote growth and blooms that are healthy.

Watch Out for Aphids

There will always be insects lurking around and knowing how you can get rid of aphids would be essential. There are different treatments to choose from and doing one for your spirea is an important thing to do.

Pruning Process Of Your Spirea

1. Don’t Worry About Cutting Your Spirea

First timers are usually nervous when it comes to pruning, and you shouldn’t be.

The reason behind this is because spirea can cope with pruning even if you prune them brutally since they have the ability to grow back no matter how severe the pruning is.

If you have shrubs that are newly planted, then you don’t need to worry about pruning them that much.

All you have to do is to give them a little trimming or reshaping during their first year.

2. Keep a Few Buds per Stem

When cutting the stem of the spirea, it would be best to cut them back so that there will be a few buds left on it.

For you to successfully do this, make sure that your pruning shears or gardening shears are sharp.

If you see any decaying or diseased growth, it would be best to remove them immediately. Weak looking stems and growth should also be removed.

3. Start Thinning the Spirea Out

Why Pruning is Needed for Spirea?

Now for you to ensure that the bush of the spirea will not become too dense, you need to ensure that the branches that are located in the middle would be thinned out.

This will help the congestion to be removed. To do this, cut some of the branches that are making your spirea bush thick.

4. Removing the Suckers from Spirea

The next thing that you need to do is to ensure that any suckers that are undesired should be removed.

The suckers are the shoots that are growing out of the rootstock of the plant.

You can do this by scraping some of the soil around your root and start tearing the sucker off.

It would always be best to just scrape them instead of cutting them to prevent the suckers from growing.

5. Pruning Woody and Old Spirea

When to Prune Spirea Shrubs?

Now, once you are done pruning your spirea, it would be best to give them some care. This is by providing them a fertilizer, water, and a new batch of mulch.

When choosing a fertilizer, it would be best to choose a slow release one, wherein a bone, fish, and blood are known as good options.

Start scattering the fertilizer under the spirea and gently rake them into your soil.

When it comes to watering, avoid overly doing this especially if your soil can’t be drained easily since it can ruin the leaves and turn them into a yellow color.

It is also ideal to add 2 inches of well-rotted, leaf mold, or compost around the spirea plant as these things can perfectly act as the mulch.

Another thing that you can do with your spirea besides pruning is dividing them.

The reason behind this is because after growing your spirea they tend to become clustered and dividing them is the best option that you have.

To do this, you can divide the plant at their roots, which will not only help them be revived but will also help remove any growth that is old.

You can do this during the late fall season since it is where they are dormant.

Wrapping Up Tips on How and When to Prune Spirea

Everything that you need to know about the tips on how and when to prune spirea are discussed above to ensure that your spirea will provide your garden the beauty that it deserves.

Start caring for your spirea for you to ensure that they will stay healthy all year round.

Just don’t forget to water them and fertilize your spirea after the pruning process.

About the Author Ann Katelyn

I'm Ann Katelyn, Creator and Chief Author of Sumo Gardener. Since I was a child I've always been fascinated with plants and gardens, and as an adult this has developed into my most loved hobby. I have dedicated most of my life to gardening and started Sumo Gardener as a way to express my knowledge about gardening with the hope of helping other people's gardens thrive.

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