Lemon-Scented Geranium: Keep Mosquitoes and Ticks Away from Your Garden

A modest-looking plant can make a noticeable difference.

In spring, many gardeners carefully prepare their beds, thinking about roses, vegetables and herbs – but not about the unwelcome residents: mosquitoes buzzing around their ears and ticks lying in wait in the grass for their next host. This is where a particular fragrant plant comes in. It is not only attractive, but can also make the garden considerably more pleasant.

Why gardens and patios become a paradise for mosquitoes and ticks

As soon as temperatures consistently rise above ten degrees in spring, the first mosquitoes begin their season. In many areas, this happens as early as March or April. They become especially troublesome in summer, particularly near ponds, water butts, saucers holding water or dense vegetation.

Ticks are even more persistent. They become active from around seven degrees, favour slightly damp, shaded spots, and are most commonly found in:

• tall grass
• thick hedges and shrubs
• leafy corners and “woodland islands” in the garden
• transition zones between lawns and bushes

Anyone walking barefoot in these areas, letting children play there or allowing the dog to run about can quickly pick up unwanted guests on their legs or in their fur. Ticks can transmit Lyme disease, among other illnesses, while mosquitoes are not merely irritating: they can trigger allergies and inflammation.

The combination of slightly overgrown garden corners and small collections of water turns the family garden into a buffet for blood-sucking insects in spring and summer.

Many people immediately turn to harsh chemicals or cut the lawn extremely short. Both approaches can help, but they also have drawbacks: reduced biodiversity, possible insecticide residues and unpleasant smells. A much gentler approach, which gardening enthusiasts are rediscovering, is to use fragrant plants that insects dislike in carefully chosen places.

The star among mosquito-repelling plants: the lemon-scented geranium

One plant stands out in particular: the lemon-scented geranium (also often called lemon geranium, botanically Pelargonium citronum). It resembles an ornamental scented geranium, yet can be remarkably effective in the fight against mosquitoes and ticks.

The plant grows into a bushy clump measuring between 40 and 100 centimetres tall. Its defining feature is its soft, deeply cut leaves, which release an intense lemon scent when touched. People generally find this fragrance fresh and pleasant, whereas many insects prefer to keep their distance.

Two key fragrance compounds in its leaves are responsible:

• Geraniol – a natural alcohol used in many organic insect-repellent products
• Citronellol – familiar from citronella oils and mosquito-repellent candles

Studies indicate that high concentrations of geraniol can reduce the likelihood of ticks attaching themselves by considerably more than half. In outdoor mosquito trials, a geraniol scent field cut the approach of female mosquitoes by around three quarters. Naturally, the plant is not a substitute for a full protective spray on the skin, but it can noticeably lower the basic level of insect activity around the home.

The lemon geranium does not create an invisible wall, but it makes mosquitoes and ticks less keen to linger near you.

How to position lemon-scented geraniums properly in the garden

In the UK, the plant tolerates frost poorly. It is therefore safest to grow it in pots or containers. This brings another advantage: you can place it precisely where it is most useful.

Position and compost

• Position: as sunny, warm and sheltered from the wind as possible – for example, beside the patio, on a balcony or near the front door
• Compost: a loose, free-draining growing medium, ideally with a little sand or expanded clay at the bottom of the pot
• Planting time: from March or April, once severe overnight frosts are no longer expected

It is important that excess water can drain from the pot. Waterlogging weakens the plant and causes its roots to rot. A standard container with drainage holes is entirely sufficient.

Creating the ideal “scent barrier”

A single pot on the windowsill is often not enough to create a noticeable everyday effect. Instead, plan a small scented line around the outdoor spaces you use most:

• several pots along the edge of the patio
• one container directly beside the garden table
• one pot on each side of the patio or balcony door
• containers close to children’s play areas or the dog’s bed

Before eating outside in the evening, one small step is worthwhile: rub a few leaves between your fingers so their scent is released more strongly into the air.

Practical tips: care, overwintering and everyday use

An easy-going summer plant with few demands

The lemon-scented geranium is regarded as uncomplicated to care for. A few basic rules are enough:

• Watering: water regularly but moderately. Allow the top layer of compost to dry out before watering again.
• Feeding: apply a liquid fertiliser for flowering plants every two to three weeks from April to August.
• Pruning: lightly trim spent stems and overly long branches to keep the plant compact and bushy.

In autumn, before the first frosts arrive, it is best to bring the pots indoors or into a frost-free conservatory. A bright, cool room is ideal. Water less and stop feeding altogether – the plant will produce new growth from spring.

Applying the scent directly to skin – with care

Some gardening enthusiasts like to rub a leaf over their arms or ankles during summer. This intensifies the scent in the immediate surrounding area. Anyone with sensitive skin should first test it on a small patch.

A gentler option is to transfer the scent to clothing or a chair instead: lightly crush the leaves, then brush them over trouser legs, socks or the back of a garden chair. This brings the aromatic compounds close to the body without putting them directly on the skin.

Combining lemon-scented geraniums with other measures for a more relaxed garden

The lemon-scented geranium works best as part of a broader package of measures. A few simple routines can make all the difference:

• empty plant-pot saucers regularly, or remove them altogether
• cover water butts so mosquitoes cannot use them as breeding sites
• cut back tall grass in heavily used areas, while keeping woodland-style corners towards the edges
• check skin and clothing for ticks after walks through tall grass

For households with dogs or cats, tick protection arranged in consultation with a veterinary practice is also worthwhile. The plant may reduce the risk, but it does not replace this protection.

What geraniol and citronellol do

Geraniol and citronellol are known as terpene alcohols – natural fragrance compounds produced by many plants to defend themselves against pests or attract pollinators. Both substances are highly valued in the perfume industry because they provide fresh, floral and citrus notes.

At higher concentrations, these scents interfere with the ability of many insects to orient themselves. Mosquitoes find hosts primarily through scent and carbon dioxide. When the air is filled with intense plant aromas, it becomes harder for them to home in on a target. This is exactly the effect used by the lemon-scented geranium.

Anyone who enjoys experimenting can tie the leaves into small scented posies and place them on the garden table. Used alongside a candle or lantern, the fragrance rises more strongly without requiring synthetic substances.

Who benefits most from this plant

The lemon-scented geranium is especially suited to people who enjoy spending time outdoors but do not want to rely constantly on sprays or candles. Typical examples include:

• families with a patio or balcony
• dog owners whose pets spend a great deal of time in the garden
• barbecue enthusiasts who want to enjoy mild summer evenings
• urban balcony gardeners hoping to keep mosquitoes away from their home

In small gardens or on balconies, the plant also combines well with other fragrant plants, such as lavender, thyme or lemon balm. The result is an aromatic mix that looks attractive, smells pleasant and makes the outdoor season much more relaxing.