When is the best time to prune lemon trees


How to prune a lemon tree

It’s important to know how to prune a lemon tree if you want a healthy plant abundant with zesty fruit.

Lemon trees are a popular addition to patios, and make delightful house plants in conservatories and sunny living rooms, and give a Mediterranean flavor to kitchen garden ideas. 

A slow-growing fruit, lemons can take up to a year to go from bud to edible fruit. So patience is key – invest some time pruning your lemon tree now, and you will lay the foundation for a bountiful crop later on.

Whether you have grown lemon from seed or bought it from a garden center, it’s essential that you don’t neglect it and allow it to become overgrown and unproductive.

(Image credit: Future/Brent Darby)

How to prune a lemon tree – step by step guide

Lemon trees should be pruned from their second year onwards, otherwise they can become very leggy, overcrowded with branches, and out of shape.

First, make sure you have the right tools for the job. ‘The most important part of pruning a lemon tree is to use very sharp pruners that have been disinfected with rubbing alcohol beforehand,’ says Joseph Marini, principal of At Home with Joseph . 

'Cuts that cause tears can introduce disease or stress, and pruners that have been previously used on diseased plants can cause cross contamination to your lemon tree.’

However, for branches you may need a more substantial tool. 'Typically your lemon tree will be better served with a clean, sharp hand-saw or pole-saw (for higher branches), which will make much more precise, and neat incisions,’ advises Andrew Gaumond horticulturist, botanist, and director of content at Petal Republic .

  1. ‘To start with, remove suckers or basal shoots at the base of the lemon tree,’ says Marini. Suckers are very fast growing and often their leaves look different from the grafted part of the tree. If you don’t remove them flush at the base, they will steal water and nutrients from the rest of the tree, so do this as soon as you notice them.
  2. Next, remove any dead, diseased or damaged branches. ‘Any growth that appears discolored, diseased or has been invaded by any pesky insects (such as scale or mealy bugs) should be removed immediately as and when they appear throughout the year,’ adds Marini.
  3. Thin out branch structures. ‘Over time lemon tree branches will often start to compete with one another for light and nutrient sources,’ says Gaumond. ‘Thin out overlapping branches, and the overall structure of the tree so it has sufficient aeration and access to light. More mature branches shouldn't be cut flush to the trunk or parent branch – instead, leave at least 5 inches of branch in place, which will better enable the tree to recover from the shock of pruning.’
  4. ‘Where there are double shoots that run almost parallel upwards, cut off the inside shoot,’ advises Sigrid Hansen-Catania, author of Success with Citrus Fruit .
  5. Hansen-Catania also recommends removing shoots that grow horizontally into the crown (cross shoots), making it denser, as well as any weak shoots that hang downwards – these should be cut off at the base.
  6. When pruning a lemon tree, it’s important to think about the shape. ‘A citrus plant is particularly attractive with a shaped crown, and the round crown is characteristic. ‘To do this, target the left side and cut off selected shoots,’ says Hansen-Catania. ‘Do not take any notice of flowers or fruits. The point where you cut should always lie above a leaf.’
  7. Finally, be careful not to cut off too much. ‘Never prune more than a third of a tree in one year,’ says Marini. 

(Image credit: Raimond Klavins/Unsplash)

When should lemon trees be pruned?

Ideally prune lemon trees in late winter or early spring. ‘The trick with all citrus trees is to avoid pruning or cutting back during the flowering and fruit producing season in summer when the tree is at its most virile,’ says Gaumond.

‘Citrus trees will enter a natural period of dormancy post harvest – typically late fall through winter – which is the best time to consider pruning. Typically, I'll assess a lemon tree in the very early spring to assess what needs pruning before the growth cycle reboots for the season.

(Image credit: Future / Mark Bolton)

Pruning potted lemon trees

Potted lemon trees should be pruned in exactly the same way as other lemon trees, but you should be conscious of keeping them to a manageable size. 

'Although you can prune the branches to achieve the needed size of the lemon tree, it’s not enough. Lemon trees can grow up to 20-25 feet, but you don’t want them to do that inside your house,’ says experienced botanist Ronnie Collins, who also founded Electro Garden Tools . 

‘Make sure to stop providing the plant with larger pots as soon as it reaches four feet tall. It’s an optimal size for fruiting in a pot. A pot of the right size will prevent the plant from growing larger.’

Hard pruning citrus trees

Occasionally lemon trees need a hard prune to rejuvenate them. ‘A radical cutting back is the last-ditch means of healing a citrus plant,' says Hansen-Catania.

'A lemon tree, for example, that has been overwintered in a room that was not sufficiently bright and too warm will react to these unfavourable conditions with increased loss of leaves. Cutting back will then be the only way to renew the plant and help it to grow healthy shoots. 

'Cut the plant back by about half and at the same time try to bring the crown into shape. The best time to do this is in the spring, before a new growth spurt begins.'

(Image credit: Future / Michelle Garrett)

Can you over prune a lemon tree?

It is possible to over prune a lemon tree, which will impact its fruit production, and potentially kill it. Don’t cut it back by more than a third unless you are attempting to renovate a failing plant, in which case you can cut it back by up to half its current size.

How do you prune a Meyer lemon tree?

A Meyer lemon tree is a hybrid variety from China that is a cross between a lemon and a mandarin. It produces smaller, smoother, sweeter fruit with a thinner skin. You can prune Meyer lemon trees in the same way as other varieties.

Should I cut the thorns off a lemon tree?

Many lemon varieties are bred not to have thorns, especially grafted varieties, so check to see whether the thorny branch is in fact a sucker. This will be growing from the rootstock below the graft. If so, remove it.

If you have a thornier lemon tree variety, you can remove the odd inconveniently located thorn without risk of harming the plant. However, there is no benefit to removing all of them, and you may cause damage to the plant by doing so.

Can you top a lemon tree?

You should not cut the top off a lemon tree and expect it to survive. If the plant requires a hard prune to renovate it, you should cut the branches by no more than half.

How To Prune Your Citrus Trees

Israel Osuna Citrus Trees | My New Citrus Tree | Pruning Guide
February 2022 6 minute read

Pruning citrus trees is an important part of tree management. Early tree shaping will give you the best start and pruning older trees is great for managing fruiting surface area. Continue reading to learn more on how to prune your citrus trees.

The ideal time for pruning citrus trees is in early spring or after your last frost which is just before the spring flush (new growth). You want to prune at this time is to allow flush to harden off before citrus leaf miner is present. Pruning in summer or fall will cause the tree to flush just during a time of maximum leaf miner pressure resulting in lots of damage. Pruning your citrus tree in winter can be problematic because the tender new growth has the potential to be damaged by freezing temperatures as it won't have time to harden off.

Before we begin pruning, we need to gather a few tools and sanitize. Common tools for pruning include your classic pruning shears for cuts smaller than an inch, Loppers for cuts up to two inches, and an optional pruning saw that can help when making larger cuts to established trees. Safety equipment like gloves and safety glasses are also very important when working on thorny trees like citrus. Sterilize your tools with rubbing alcohol or 2% bleach solution (1 part bleach: 50 parts water). Bleach is quite corrosive, so rinsing your tools with water after treatment will help to prevent rusting. Repeat this cleaning step at the end of a day's work to maintain sterile tools and consider treating your tools with machine oil or WD-40 to further protect your tools from oxidation.

One thing to note before we dive into pruning is that pruning citrus (Lemons, Limes, Mandarins, Oranges, Kumquats, Grapefruits & Pomelos) trees is different in pruning deciduous fruit trees like pome & stone fruits. Citrus trees are subtropical evergreen trees with very different growing habits and prefer a more hedged pruning method over to the structured pruning methods used in deciduous fruit trees.

Now that our tools are cleaned up, let's start with a fresh tree from the nursery as our example. Most citrus trees fresh from the nursery are grown as whips some having a few branches to start with. When planting a juvenile tree, it is crucial that you implement an annual tree pruning habit to manage the tree growth over the years. It is recommended that you top your tree at the time of planting to encourage branching and get your tree to push lots of lateral growth in its first few seasons. This can be done with a simple heading cut. A heading cut will reduce a lengthy branch by about half and encourage side branching which will create a fuller and more bushy tree.  For a new whip of a tree choose a location about a quarter of the way down from the top to cut your tree and encourage branching. Be careful during this step not to reduce your tree too low, since most fruit trees are grafted and cutting your tree below the graft line will result in a tree that is purely rootstock and will not have the desired fruiting variety. If your tree already has decent branching at the desired height, you can skip this step and simply pinch off the terminal buds of each branch to encourage more branching. A terminal bud is a bud at the very end of a branch. 

When pruning any kind of fruit tree you want to be mindful of your graft line. The graft line is the point at which the rootstock has healed with the fruiting variety. You can identify your graft line by a line of scar tissue that is typically about 4”-8” above the soil line. It is very important to remove any growth from below the graft line to prevent rootstock from taking over. You may ask yourself, “why is my tree grafted if the rootstock doesn’t produce good fruit?” Rootstocks are chosen primarily for their ability to create a smaller than standard size tree and also for their ability to resist pests and diseases. Any growth coming from the rootstock (aka: suckers) should be removed.

For your more established trees or larger nursery stock citrus trees, pruning should be done post-harvest in late winter or early spring as well. The goal is to get comfortable with pruning your tree and not be afraid to make necessary cuts to achieve the desired shape. A good place to start is by removing all of your dead, damaged, or diseased branches. Thinning out these unproductive branches will improve airflow and light reach within the tree as well as redirect energy to fruiting branches. Inner canopy leafless branches can also be removed since the lack of light is likely why they defoliated in the first place. Once our unproductive wood is removed, we can head back lengthy branches to keep the canopy compact. In a commercial setting citrus trees are hedge pruned to regulate the shape and so that the canopy is one solid mass to maximize fruit production and enable allow for ripening.

If your main goal is fruit production on your tree, keeping a young tree compact and cutting back lengthy growth will keep the canopy to an optimal shape for easy maintenance, even light penetration, and make for easy harvesting. These steps of early shaping in young trees will greatly reduce the need for intensive pruning in the future.

Once you are happy with your final shape, look over your tree and identify areas where light is penetrating the canopy and directly hitting exposed branches and or trunk. Applying a layer of IV Organics Plant Guard tree paint to these exposed branches/trunk areas will help protect the tree from sunburn and winter scald until the canopy fills out. This step is crucial for growers in climates that get over 90°F in the summer. 

Pruning a citrus tree is not difficult and if I can give any words of advice here, it would be: don’t be afraid to cut the tree back. The tree will always grow back and you can continue to reshape it as you practice from season to season.


Shop Citrus Trees 

Protect your tree from sunburn, insects & rodents with PLANT GUARD tree paint & foliar spray.

 

Protect your roots from rodents with ROOT GUARD the original gopher wire basket. 

 

Feed your fruit tree with Romeo Plant Food.  This water-soluble fertilizer is great for in-ground or in-container growing. 

 

Author: Israel Osuna

 

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