How Do You Split Lavender Plants

You split lavender plants by digging up the entire root ball and dividing it into smaller sections, each with its own roots and stems.
 
It’s one of the best ways to refresh an overgrown plant, multiply your lavender for free, and keep your garden smelling like a summer dream.
 
If you’ve been wondering how do you split lavender plants, the good news is that it’s a simple job most gardeners can handle with just a spade, a sharp knife, and a little patience.
 
In this post, we’ll walk through when to split lavender plants, how to do it step by step, and how to care for your new divisions so they thrive.
 
Let’s dig in.
 

When Should You Split Lavender Plants?

Timing matters more than you’d think when you split lavender plants.
 
Get it right, and your divisions bounce back fast.
 
Get it wrong, and you’ll be nursing sad, sulky shrubs for months.
 

1. Early Spring Is the Sweet Spot

The best time to split lavender plants is in early spring, just as new growth starts to appear.
 
The plant is waking up, the soil is workable, and the weather is cool but not freezing.
 
This gives your divisions the whole growing season to establish roots before winter.
 

2. Early Fall Works Too in Mild Climates

If you live somewhere with mild winters, you can also split lavender plants in early fall.
 
This gives the roots time to settle in before the cold arrives.
 
Just avoid splitting too late in fall, because young divisions won’t survive a hard freeze.
 

3. Avoid Splitting in Summer or Deep Winter

Don’t try to split lavender in the middle of summer.
 
Heat stress plus root disturbance is a recipe for disaster.
 
Same goes for deep winter when the plant is dormant and the ground is frozen solid.
 

How Do You Split Lavender Plants Step by Step?

Splitting lavender isn’t complicated, but a little prep goes a long way.
 
Here’s how do you split lavender plants without killing them in the process.
 

1. Water the Plant a Day Before

Give your lavender a good drink the day before you plan to split it.
 
Moist soil holds together better and makes the root ball easier to lift.
 
Dry, crumbly soil means more root damage and more stress on the plant.
 

2. Dig Around the Root Ball

Use a sharp spade to dig a circle around the plant, about 6 to 8 inches from the base.
 
Work the spade underneath and gently lift the whole root ball out of the ground.
 
Don’t yank it by the stems, or you’ll snap the plant in half before you even start.
 

3. Shake Off Excess Soil

Once the plant is out, shake or brush off the loose soil so you can see the roots.
 
This makes it much easier to figure out where to divide the plant.
 
If the roots are tightly matted, you can rinse them with a hose to separate them.
 

4. Divide With a Knife or Spade

Now for the main event.
 
You can split lavender plants by cutting straight through the root ball with a sharp knife or a clean spade.
 
Aim for sections that each have a healthy mix of roots and green stems.
 
Most lavender plants can be divided into two to four new plants, depending on size.
 

5. Trim Back the Tops

After you split lavender plants, trim the stems back by about a third.
 
This reduces the demand on the roots while they’re re-establishing.
 
It feels harsh, but it’s one of the best things you can do to help your divisions survive.
 

6. Replant Right Away

Plant each division into well-draining soil at the same depth it was growing before.
 
Lavender hates wet feet, so if your soil is heavy clay, mix in some grit or sand.
 
Space the new plants 12 to 18 inches apart so air can move between them.
 

How Do You Care for Lavender After Splitting?

The first few weeks after you split lavender plants are the most important.
 
Get the aftercare right, and your divisions will reward you with bushy growth and plenty of blooms.
 

1. Water Deeply but Sparingly

Water your new lavender divisions deeply right after planting, then back off.
 
Lavender is drought-tolerant once established, and overwatering is the number one killer.
 
Let the soil dry out between waterings, and never let the roots sit in soggy ground.
 

2. Skip the Fertilizer

Don’t feed freshly split lavender plants.
 
Fertilizer pushes soft, leafy growth when the plant should be focusing on roots.
 
Too much richness also makes lavender floppy and short-lived.
 
A little compost is plenty.
 

3. Mulch With Grit, Not Bark

If you mulch around your lavender, use gravel or coarse sand rather than bark chips.
 
Bark holds moisture against the stems and can cause rot.
 
Grit keeps the base of the plant dry, which is exactly what lavender wants.
 

4. Give Them Sun

Lavender needs at least six hours of full sun a day.
 
After you split lavender plants, put the divisions somewhere bright and airy.
 
Good airflow helps prevent fungal problems while the plants recover.
 

So, How Do You Split Lavender Plants?

You split lavender plants by digging up the root ball and dividing it into smaller sections, each with roots and stems of its own.
 
Early spring is the best time, though early fall works in mild climates.
 
Water the day before, lift the plant carefully, cut through the roots, and replant the divisions right away in well-draining soil.
 
Then keep the water light, skip the fertilizer, and let the sun do its thing.
 
Do it right, and one lavender plant can quickly become a whole fragrant hedge.