How to prune a lemon tree

Managing a commercial citrus orchard or running a farm requires not only passion, but also a thorough understanding of the biological processes of the plants. Amongst cultivation practices, pruning lemon trees is undoubtedly one of the most crucial: when carried out to the highest standards, it balances vegetative growth, maximises commercial yield and protects the tree from attack by aggressive pathogens such as scale insects or citrus canker.

The lemon (Citrus limon) has unique biological characteristics compared to other fruit trees: it is an evergreen that flowers continuously and, in mild climates, can flower several times a year, and therefore requires precise pruning that respects its physiology.

At Zanon, we have been working alongside farmers and agricultural businesses in more than 65 countries around the world for over fifty years: this experience enables us to offer advice that has been verified directly in the field.

In this guide, we look at how to prune a lemon tree, the ideal time to do so, and how to select the right branches, in order to protect your investment and ensure the productivity of your orchard.

Pruning lemon trees: when to do it and what is the best time of year

One of the most frequently asked questions that fruit growers put to our field technicians concerns the correct timing: when should lemon trees be pruned to avoid stressing the plant?

Unlike deciduous species, citrus trees store their reserve substances mainly in their green parts, such as leaves and young branches, rather than in the trunk. This means that any drastic pruning robs the tree of vital energy.

The optimal period is between late spring and early summer (April to June), immediately after the end of winter frosts and before the peak of the summer heat.

The exact timing, however, depends on the climate zone: in southern regions, where the risk of late frosts is lower, pruning can be carried out as early as March, whilst in the centre and north – particularly in colder areas – it is advisable to wait until late April.

Avoid extreme cold and heat

Our experience working alongside farms has taught us that there are two periods during which pruning must absolutely cease:

- Mid-winter (December–February): lemon trees are extremely sensitive to low temperatures. If pruned during this period, the wounds struggle to heal, leaving the wood exposed to frost, which causes cracks in the tissue and paves the way for fungal infections.


- High summer (July–August): the scorching heat and water stress halt the plant’s growth. Removing foliage at this stage would expose the inner bark to severe sunburn.

How to recognise the fruit-bearing branches of a lemon tree

To understand how to prune a lemon tree without compromising its yield, you first need to be able to distinguish between the different types of branches. Unlike other fruit trees, the lemon tree flowers and bears fruit on the previous year’s branches, in the leaf axils.

In practice, by observing the canopy, you can distinguish between:

• Fruiting branches: wood from the previous year, of medium diameter, with bark that is already slightly lignified (no longer light green), often oriented towards the outer edge of the canopy where they receive more light. These are the branches to retain, as they will bear flowers and fruit.

• Suckers (or shoots): very vigorous, straight branches, often with long internodes, which grow vertically from the trunk or the main branches. They are sterile in the short term and drain energy from the plant.

• Young vegetative branches: wood from the current year, still green and flexible; they will bear fruit the following year, so they are generally left to grow, being thinned out only if they become too dense.

A useful tip: lemon trees grown from seed, or left to run wild, develop substantial thorns on their trunk and branches. Grafted trees that are regularly tended, on the other hand, tend to lose these thorns: another clue for assessing the vigour and history of the tree you are pruning.

Which lemon branches should be pruned?

Let’s get down to the practicalities: which branches of the lemon tree should be pruned each year. Generally speaking, targeted pruning is required, rather than a general thinning out.

Dandelions and suckers

Basal suckers and water shoots should almost always be removed, especially if they are very vigorous and growing upright, as they do not produce fruit in the short term and drain energy from the fruiting branches.

The exception is where they are needed to fill a gap in the canopy: in this case, they can be shortened (pruned back), allowing them to become productive in subsequent years.

As the wood is tender and the diameters are small, a Plug-in battery-powered pruning shear is ideal for these cuts: lightweight and with no cables to get in the way, it allows you to work quickly, even on several plants in a row.

Dry, diseased or damaged branches

They should always be cut back, at any time of year if necessary, as they pose a plant health risk to the rest of the plant. They should be cut back a few centimetres below the affected part, until healthy wood is reached.

Overlapping or crossing branches

When two branches rub against each other or compete for the same space and light, it is best to remove one of them, favouring the better-positioned and more productive one. This work also helps to keep the centre of the crown airy, reducing the build-up of moisture. Furthermore, friction caused by the wind damages the bark, creating entry points for pathogens.

Take care, however, with the actual fruit-bearing branches: these should only be thinned out if they cast too much shade within the canopy, not systematically removed. As a general rule, you should never remove more than 30 per cent of the canopy in a single pruning session, so as not to upset the balance between the above-ground and root systems and to avoid stimulating excessive and disorderly growth.

Lemon tree pruning guide: a step-by-step guide

Here is a simple lemon tree pruning guide to follow, suitable for both individual trees and larger plots.

1. Examine the canopy before cutting: identify suckers, dead wood and overcrowded areas before you begin, so that you have a clear plan of action.

2. Start with the dead or diseased branches: these are the least risky cuts and allow you to see the tree’s actual structure more clearly.

3. Remove the most vigorous suckers: cut them off at the base, without leaving any stubs, as these would simply become starting points for new suckers.

4. Thin out overly dense areas: remove one of the branches that are crossing or overlapping, leaving the one with the best exposure.

5. Assess the final height and shape: restrict the plant’s growth if necessary, always making cuts back to secondary wood, and never pollarding the main branches.

Citrus trees require a much more conservative approach than pome or stone fruit trees; to check this, you can compare these techniques with the general guidelines on how to prune fruit trees.

How to make the correct cut

Lemon trees are particularly sensitive to pruning cuts on branches with a diameter greater than 3–4 centimetres: if such pruning is absolutely necessary, it is better to spread the work over two or three years rather than carrying it out all at once. On larger plots, where cuts of this kind are frequent, a professional-grade electric pruner such as the PRO line guarantees power and precision even on thicker wood, without tiring the user. Some practical tips that apply to any tool:

• always use sharp, disinfected blades to avoid tearing the bark;

• cut at an angle of approximately 45°, to prevent water from pooling on the wound;

• respect the branch collar (the small bulge at the base), without leaving stumps or cutting flush with the trunk;

• for larger-diameter cuts, consider applying a healing sealant;

How to prune a lemon tree: techniques for professional citrus orchards

The intensity and type of pruning change as the orchard ages. On market-oriented farms, two distinct strategies are adopted.

Training pruning

This is carried out within the first 3–4 years after planting. Our agronomic aim is to establish the tree’s skeletal structure, usually favouring a low-structured globe shape or a vase shape. This shape protects the trunk from sunburn and keeps the crown at an accessible height.

During this delicate phase, every cut must be clean and free from fraying to ensure rapid healing. The use of battery-powered pruning shears ensures surgical precision thanks to the progressive control of the blade. Their exceptional lightness and ergonomic design allow field teams to maintain a high level of accuracy throughout the day, minimising stress on the young plant’s tissues.

Production pruning and thinning using pole pruners

On mature plants, the aim is to maintain the shape and, above all, to ensure good air circulation. A dense, damp centre of the canopy provides the ideal environment for sooty mould to develop.

This is addressed by pruning back the lateral twigs to stimulate new growth, and by thinning out the top of the canopy to allow overhead sunlight to penetrate. The branches in the lower part of the canopy, whilst highly productive, should be shortened if they touch the ground, thereby protecting the fruit from soil moisture and soil-borne infections.

When globe-shaped canopies expand or planting densities are high, the use of professional battery-powered pruners – including pole-mounted models – allows the highest and innermost parts to be reached directly from the ground. This eliminates the need for unstable ladders, optimises the farm’s working time and ensures the operator has a perfect view of the structure being worked on, whilst safeguarding the lower fruit-bearing branches, which must not touch the ground.

Pruning potted lemon trees: what’s different

In colder areas, or simply for ornamental purposes, lemon trees are often grown in pots. In this case, pruning requires a little more care than when grown in the open ground:

• the vigour of the canopy must be kept in check to prevent the plant from growing beyond the manageable size of the pot;

• a globular shape is generally preferred, whilst encouraging pendulous side shoots, where fruit develops more easily;

• pruning should be coordinated with repotting, which is best done in spring alongside a renewal of the growing medium;

For young plants or potted specimens with still-slender branches, a compact model such as the ZM 22 pruning shears is recommended for precise cuts without risking damage to the more tender wood.

If you manage several potted specimens, whether on your farm or in a nursery, you’ll also find more general practical guidance in our article on how to prune potted plants.

What to do with lemon pruning waste

Following pruning, particularly when carried out on multiple trees or large plots, the volume of branches and green waste to be disposed of can be considerable. Rather than piling them up or burning them, it is better to turn them into useful wood chips: a wood chipper or a bio-shredder quickly reduces branches and brushwood into wood chips, which can be reused for composting or as mulch between the rows.

Final thoughts: choosing the right partner for your citrus orchard

Pruning lemon trees is an investment in the future productivity of your farm. As we have seen, it is not enough to know the agronomic theory or to be able to identify the perfect time of year: what really makes the difference in the field is the cleanliness of the cut, the speed of execution and the safety of the operators.

Every patent and every technology we develop in Zanon’s laboratories is designed precisely for this purpose: to transform agricultural work into a more efficient, profitable and sustainable activity for the plant. Relying on professional, high-engineering tools means protecting the health of your orchard and optimising labour management costs.

No two citrus orchards are the same, and every region has its own specific climatic and cultivation requirements. For this reason, we invite you to contact your nearest authorised Zanon dealer.

Through our network of local partners, you’ll find experienced professionals ready to guide you in choosing the ideal setup for your needs, to demonstrate the precision of our battery-powered shears and pruners in person, and to guarantee you a swift and impeccable after-sales service.