When Should You Trim Arborvitae for Optimal Shape and Size

Trimming your arborvitae is an essential part of maintaining its shape and size, and the best time to do it depends on its growth habits.

Arborvitae typically grows 3-5 feet per year, so regular trimming is necessary to control its size and encourage a dense, compact shape.

Pruning in the spring, when new growth begins, is ideal for shaping and maintaining the overall form of your arborvitae.

After pruning, arborvitae can be quite vulnerable to disease and pests, so it's essential to keep an eye out for any signs of trouble.

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Trimming your arborvitae trees at the right time is crucial for their health and appearance. Early spring, just before the growing season begins, is the best time for major pruning to maintain tree height and shape.

In Rockford, IL, we recommend trimming your trees in March. This allows the trees to grow back quickly and look their best.

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Minor pruning of an errant or damaged branch can be fixed at any time of the year, but it's essential to be gentle when pruning. Removing dead branches is one thing, but removing large sections of a live tree can be stressful to the plant.

A good rule of thumb is to remove no more than a third of the shrub per season. Consistent trimmings over time are better than butchering your arborvitae in one go.

Here's a summary of the best times to trim your arborvitae:

Remember, arborvitae don't do well with rejuvenation pruning, so avoid cutting them back almost to soil level. If your plant is severely damaged, it's best to replace it with a new one.

To prune an arborvitae tree effectively, you need to assess the tree first to identify dead, diseased, or damaged branches. This will help you focus on targeted pruning to encourage healthy growth.

When pruning, use the right tools, such as sharp pruning shears, loppers, and a pruning saw. Dull tools can cause damage to the tree, so keep them sharp and clean.

Prune sparingly, as arborvitae trees are slow-growing. Focus on removing only dead or diseased branches and any branches crossing or rubbing against each other. This will help maintain the tree's natural shape and prevent over-pruning.

Here are some key pruning techniques to keep in mind:

It's essential to avoid cutting into the central leader, as this can lead to an unattractive, uneven shape and disrupt the tree's natural growth pattern.

When pruning your arborvitae, it's essential to know the two basic types of cuts to make the process easier and more effective.

A reduction cut shortens the overall length of a branch by cutting back to a sturdy side branch. This type of cut is ideal for maintaining the shape of your arborvitae without causing unnecessary stress.

A removal cut eliminates a branch altogether. This is useful for getting rid of any bare or damaged branches that won't sprout new growth.

To ensure you're making the right cuts, always look for stems with green foliage to guide you. This will help you determine where to prune and avoid cutting back too far.

Here are the two basic pruning cuts summarized:

Pruning arborvitae can be a bit tricky, but don't worry, I've got some tips to help you out.

First, only prune damaged or dead branches as soon as you notice them, to prevent them from breaking off and causing a mess.

Prune for shaping in the early spring, or do some light trimming from spring to mid-summer. However, avoid pruning later in the summer and into fall, as it can encourage tender new growth that may be damaged by cold weather.

Some other things to keep in mind:

Here's a quick rundown of the best times to prune arborvitae:

Remember to prune sparingly, as arborvitae trees are slow-growing and can be stressed by excessive pruning. Focus on removing dead or diseased branches, and avoid pruning the central leader excessively to maintain the tree's pyramidal shape.

Lastly, be aware that removing large sections of a live tree can be stressful to the plant, so aim to remove no more than a third of the shrub per season. Consistent trimmings over time are better than butchering your arborvitae in one go.

Pruning for shape is a crucial aspect of maintaining your arborvitae's health and aesthetic appeal. Prune damaged or dead branches as soon as you notice them to prevent them from breaking off and dropping on their own.

Pruning for shaping is best done in the early spring, allowing the plant to fill in and look good again quickly. Avoid pruning later in the summer and into fall, as it can encourage tender new growth that may be damaged by cold weather.

Shearing your arborvitae throughout spring and early summer is also an option, but be mindful of not cutting back too far into the bare wood. This can weaken the plant and reduce its ability to produce new growth.

To maintain the perfect pyramidal form, regular light pruning is key. Lightly trim back any stray branches that are disrupting the tree's shape. This can be done at the end of winter, right before new growth begins, or in early spring.

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Here are some pruning tips to keep in mind:

Trimming an overgrown arborvitae can be a bit tricky, but it's essential to get it right. Arborvitaes grow quickly at the top, which can cause issues visually and structurally.

Removing dead branches is one thing, but removing large sections of a live tree can be stressful to the plant. Aim to remove no more than a third of the shrub per season. Consistent trimmings over time are better than butchering your arborvitae in one go.

Don't be overly eager with the lopping shears, especially in the heat of mid-summer. This is no time to be making drastic changes. Limit hard pruning to early spring while your plants are still dormant.

You can cut arborvitae to the ground, but we wouldn't recommend it. It may take some time to grow back, and it may never return to its former glory.

For more insights, see: How Fast Do Arborvitaes Grow

Pruning arborvitae can be a bit tricky, but with some basic knowledge, you can keep your evergreen hedgerow looking healthy and beautiful.

Avoid cutting back arborvitae branches farther than where you see stems with green foliage, as bare branches won't sprout new growth.

Arborvitae don't do well with rejuvenation pruning, which can cause stress and stunt the tree's growth. If your plant is severely damaged, it's best to replace it with a new one of similar size to maintain a balanced hedge.

Don't prune your arborvitae until they're at least a year old, as pruning too much at a young age can cause stress and stunt the tree's growth.

For established arborvitae, you can prune them in the late spring or early summer, just before a flush of new growth, to maintain plant health. Optimal timing is when you remove no more than one-third of the live foliage area per growing season.

Pruning arborvitae can be done in a way that encourages lateral growth, resulting in a thicker hedge. "Topping" them in the early spring, by shortening the tree, can help push more lateral growth.

Additional reading: Can You Trim Boxwoods in the Spring

Prune damaged or dead branches as soon as you notice them to prevent them from breaking off and dropping on their own. Prune diseased branches as soon as possible to help contain the problem area.

In the early spring, note which branches you want to prune to create your desired height and width. Use pruners or loppers to trim your targeted branches, but avoid cutting back more than 20% of the shrub's height.

Make sure the base of the arborvitae remains wider than the top, so the lower branches can still receive sunlight. Prune off dead, damaged, or diseased branches as they arise, cutting them back all the way to the trunk.

Prune back to the point where you see stems with green foliage, unless you can live with not having a branch there at all. Bare arborvitae branches won't sprout new growth.

Here's a quick guide to pruning arborvitae: