How To Prune Fountain Grass

You prune fountain grass by cutting the entire clump back to about 4 to 6 inches above the ground in late winter or early spring.
 
This simple process is the best way to keep your ornamental grass looking fresh, healthy, and vibrant all season long.
 
Pruning fountain grass isn’t complicated, but doing it at the right time and with the right technique makes a world of difference.
 
In this post, we’ll walk you through exactly how to prune fountain grass, why it matters, and the common mistakes to avoid so your plant thrives.
 
Let’s dive in and get your fountain grass ready for its best year yet.
 

When to Prune Fountain Grass for Best Results

The timing of when you prune fountain grass is just as important as how you do it.
 
Pruning fountain grass too early in the fall can leave the crown exposed to harsh winter cold, which can damage the plant.
 
Pruning fountain grass too late in the spring might mean you’re cutting into new green growth, which sets the plant back.
 
The sweet spot is late winter to early spring, just before new shoots begin to emerge.
 

1. Why Late Winter Is Ideal for Pruning Fountain Grass

In most regions, late February through early April is the perfect window to prune fountain grass.
 
At this point, the old growth is completely dormant and dry, so you’re not sacrificing any living tissue.
 
The plant has stored plenty of energy in its roots, and cutting back the old blades encourages the crown to push out fresh new growth.
 
If you wait until you see green tips poking through, you can still prune fountain grass, but try to do it before those new shoots get more than a few inches tall.
 

2. Can You Prune Fountain Grass in Fall?

You can prune fountain grass in fall, but it’s generally not recommended unless you prefer a very tidy winter garden.
 
Leaving the dried plumes and blades in place provides insulation for the crown and adds winter interest with their feathery, golden tops.
 
If you do decide to prune fountain grass in fall, wait until the foliage has fully died back after the first hard frost.
 
Then, cut it down the same way you would in spring, and add a layer of mulch over the crown for extra protection.
 

Step-by-Step Guide on How to Prune Fountain Grass

Now let’s get into the actual pruning fountain grass process, step by step.
 
It’s an easy task that only takes a few minutes per clump, especially if you have the right tools.
 

1. Gather Your Tools and Safety Gear

The blades of fountain grass can be incredibly sharp, so always wear heavy leather gloves and long sleeves.
 
For the actual cutting, you have a few options depending on the size of your clump.
 
Hand pruners work well for small, young clumps, but for mature, dense clumps, you’ll want a pair of sturdy hedge shears.
 
You can also use a sharp serrated knife or even a reciprocating saw for very large, tough clumps that have become woody at the base.
 
And don’t forget to sanitize your tools with rubbing alcohol before you start, just to prevent spreading any diseases.
 

2. Tie the Foliage Together for a Clean Cut

Before you start snipping, grab a bungee cord, rope, or a large rubber band and wrap it tightly around the entire clump.
 
Tying the fountain grass up into a tight column makes the job so much easier.
 
It keeps all the blades together so you can make one clean, even cut across the top.
 
It also helps keep the mess contained, so you’re not scattering dried grass everywhere.
 

3. Cut the Grass Down to 4-6 Inches

Now, here’s the main event for how to prune fountain grass.
 
Using your hedge shears, cut straight across the tied bundle, leaving about 4 to 6 inches of stubble above the ground.
 
Don’t cut it flush with the soil, because leaving a few inches of stem protects the crown from cold snaps and accidental damage.
 
If your clump is really large, you might need to make a couple of passes to get through all the material.
 

4. Divide the Clump If It’s Overgrown

While you’re down there pruning fountain grass, take a quick look at the size of the crown.
 
If the center of the clump looks dead or hollow, or if the plant has gotten way too big, this is the perfect time to divide it.
 
Use a sharp spade to dig up the entire root ball, and then cut it into smaller sections, each with healthy roots and shoots.
 
Replant the divisions and water them well, this is a great way to get more free plants.
 

5. Clean Up the Debris and Feed the Plant

Once you’ve finished cutting, remove the rope and gather up all the dried clippings.
 
Fountain grass clippings break down very slowly, so they’re best tossed in the compost bin or trash.
 
After cleaning up, sprinkle a slow-release fertilizer around the base of the plant, but don’t work it into the soil too deeply.
 
Water it in well, and this gives your fountain grass a nice nutrient boost as it wakes up for the growing season.
 

Common Mistakes to Avoid When Pruning Fountain Grass

Even though pruning fountain grass is simple, there are a few common slip-ups that can stress your plant.
 
Avoiding these will keep your ornamental grass looking its absolute best.
 

1. Cutting Too Early in the Season

As we mentioned, pruning fountain grass in early fall leaves the crown exposed to winter moisture and freezing temperatures.
 
This can lead to crown rot, which is often fatal to the plant.
 
Always err on the side of waiting until late winter or early spring.
 

2. Shearing Into Green Growth

If you wait too long and prune fountain grass well into spring, you might cut off the tender new green shoots.
 
This will make the plant look ragged for the rest of the year.
 
If you see a lot of green growth already, you can either leave it alone or very carefully snip out the old brown blades individually.
 

3. Not Wearing Gloves

We can’t stress this enough, but fountain grass blades are like tiny razor blades.
 
Skipping gloves can result in some pretty nasty paper-cut style injuries.
 
Always wear thick gloves when pruning fountain grass, even if it feels like a quick job.
 

So, How Do You Prune Fountain Grass for Healthy Growth?

You prune fountain grass by cutting the whole clump down to about 4 to 6 inches above the crown in late winter or early spring.
 
Pruning fountain grass this way encourages dense, fresh new foliage and prevents the plant from looking tired and brown.
 
Remember that regular pruning fountain grass keeps it tidy and promotes strong root development for years to come.
 
So grab your gloves and shears, head out to the garden, and give your fountain grass the fresh start it deserves this season.
 
Happy gardening, and enjoy your beautifully refreshed landscape.