How To Rejuvenate Old Boxwood

You can rejuvenate old boxwood by giving it a hard prune, proper feeding, and consistent aftercare.

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These tough evergreen shrubs respond very well to rejuvenation, even if they look scraggly or bare at the base.

Rejuvenating old boxwood isn’t complicated, but it does require patience and a few key steps.

Many gardeners wonder how to rejuvenate old boxwood that has become woody or overgrown, and the good news is that it’s definitely possible.

In this post, we’ll cover the best ways to rejuvenate old boxwood, including when to prune, what tools to use, and how to care for them afterward.

Let’s dig into the process of rejuvenating old boxwood so you can bring your shrubs back to their full, lush glory.

How to Rejuvenate Old Boxwood with Hard Pruning

The most effective way to rejuvenate old boxwood is through a technique called hard pruning or renewal pruning.
 
This method involves cutting back the shrub significantly to encourage fresh growth from the base.
 
Here’s why hard pruning works for rejuvenating old boxwood:
 

1. Hard Pruning Stimulates Dormant Buds

Old boxwood often becomes leggy because the outer growth shades the interior, causing lower branches to lose leaves.
 
When you cut back the stems, you wake up dormant buds along the thicker wood.
 
This is essential for rejuvenating old boxwood because those buds will produce new shoots.
 
The result is a denser, fuller shrub that looks youthful again.
 
Be aware that hard pruning for rejuvenating old boxwood should be done in late winter or early spring, just before new growth starts.
 

2. Cut Back to 6–12 Inches Above Ground

For severe rejuvenation of old boxwood, you can cut the entire shrub down to about 6–12 inches from the ground.
 
This sounds drastic, but boxwood is resilient and will push out new stems from the base.
 
If you’re hesitant, try rejuvenating old boxwood in stages over two or three years.
 
For example, cut back one-third of the oldest stems each year.
 
Either way, the goal is to remove old, woody growth that no longer produces leaves.
 

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3. Use Clean, Sharp Tools to Avoid Disease

When rejuvenating old boxwood, always use sharp bypass pruners or loppers.
 
Dull blades crush stems and increase the risk of infection from boxwood blight or other diseases.
 
Sterilize your tools between cuts by wiping them with rubbing alcohol or a bleach solution.
 
This is especially important when rejuvenating old boxwood that may already have fungal issues.
 
Clean cuts heal faster and promote vigorous regrowth.
 

Feeding and Watering After Rejuvenating Old Boxwood

Pruning is only half the battle when you want to rejuvenate old boxwood.
 
The plants need proper nutrition and moisture to fuel the new growth.
 
Here’s how to support rejuvenating old boxwood after the big cut:
 

1. Apply a Balanced Fertilizer in Spring

After rejuvenating old boxwood, give the shrubs a slow-release fertilizer formulated for evergreens.
 
Look for a product with an N-P-K ratio like 10-6-4 or similar.
 
Spread it evenly around the root zone, avoiding direct contact with the stems.
 
Water it in well.
 
Proper feeding is key to rejuvenating old boxwood because new shoots need nitrogen for leaf development and phosphorus for root growth.
 
Don’t fertilize after mid-summer, as that can push tender growth that may get damaged by frost.
 

2. Water Deeply but Infrequently

Boxwood prefers consistent moisture, especially during the recovery phase of rejuvenation.
 
Water deeply once or twice a week, depending on rainfall.
 
Mulch around the base with 2–3 inches of organic material like wood chips or compost.
 
Mulch helps retain moisture, cools the roots, and suppresses weeds while rejuvenating old boxwood.
 
Avoid overhead watering that wets the foliage, as boxwood is prone to leaf spot diseases.
 
Drip irrigation or soaker hoses are ideal for rejuvenating old boxwood.
 

3. Avoid Overfertilizing or Overwatering

Too much love can harm the process of rejuvenating old boxwood.
 
Overfertilizing leads to weak, floppy growth that attracts pests.
 
Overwatering can cause root rot, which is often fatal to boxwood.
 
Stick to the recommended rates on the fertilizer label and let the soil dry out slightly between waterings.
 
Patience is a virtue when rejuvenating old boxwood – the shrubs will bounce back, but it may take a full growing season or two.
 

Common Mistakes to Avoid When Rejuvenating Old Boxwood

Even with the best intentions, people sometimes make errors that set back the rejuvenation of old boxwood.
 
Here are pitfalls to watch out for:
 

1. Pruning Too Late in the Season

If you prune in late summer or fall while rejuvenating old boxwood, the new growth won’t have time to harden off before winter.
 
Frost can kill those tender shoots and undo all your work.
 
Always schedule your hard pruning for early spring, just as the buds are swelling.
 
For light shaping, you can trim in early summer, but major rejuvenation of old boxwood should happen in spring.
 

2. Shearing Instead of Selective Pruning

Hedge shears create a uniform surface, but they leave behind stubs and damaged leaves.
 
This is not effective for rejuvenating old boxwood because it doesn’t reach the inner wood where dormant buds live.
 
Use hand pruners to selectively cut individual stems back to a bud or a main branch.
 
This method is much better for rejuvenating old boxwood because it encourages growth from the inside out.
 

3. Neglecting Pest and Disease Checks

Old boxwood is often stressed, making it a target for boxwood leafminer, psyllids, and blight.
 
Before and after rejuvenating old boxwood, inspect the plants carefully.
 
If you see signs of infestation, treat with appropriate insecticides or fungicides.
 
Healthy shrubs recover faster, so keeping pests at bay is part of successful rejuvenation of old boxwood.
 

So, How to Rejuvenate Old Boxwood?

You can rejuvenate old boxwood by hard pruning in early spring, feeding it properly, and watering carefully.

The process of rejuvenating old boxwood takes patience, but it’s well worth the effort when you see fresh green growth replacing old woody stems.

And this Miracle-Gro All Purpose Fertilizer on Amazon can be a practical addition for you, so click the link to check it out.

Remember to use sharp, clean tools, avoid late pruning, and give your shrubs the care they need after the cut.

Whether you choose to prune all at once or gradually over a few years, rejuvenating old boxwood is absolutely achievable.

Now you know exactly how to rejuvenate old boxwood – go ahead and give those tired shrubs a second chance.