Lemon-Scented Geranium: the Natural Double Defence Against Ticks and Mosquitoes

As soon as the temperature climbs, two unwelcome visitors start turning up in lawns, hedges and along the edges of terraces: ticks and mosquitoes. They do more than spoil the mood; they can also carry disease. Yet between heavy-duty chemical sprays and the drastic option of cutting the grass to an almost bare minimum, there is a surprisingly simple extra measure: an aromatic garden plant that both insects find far less appealing.

Why ticks and mosquitoes are so fond of your garden

A typical family garden is a paradise for many insects. A little long grass, a dense hedge, perhaps a slightly shaded border - that is exactly where ticks wait patiently for their next host. They cling to blades of grass or stay close to the ground until a calf, a child’s leg or the dog brushes past.

Mosquitoes behave differently. They need water, often only in tiny amounts. Typical breeding spots include:

• Saucers under flowerpots with standing water
• Rain barrels without a lid or with gaps
• Watering cans that are left around half full all the time
• Old buckets, toys or sheet-mulch hollows where rainwater collects

Once the thermometer rises to around 10 to 15 degrees Celsius in spring, the first mosquitoes begin to appear. On genuinely warm summer nights, especially near water or overgrown perennials, patios and balconies can quickly become attack zones.

Ticks become active at around 7 degrees Celsius - much earlier in the year than many garden owners expect.

Ticks are not just annoying. Some species can transmit the bacteria that cause Lyme borreliosis. Anyone who lets children, cats or dogs run around in the garden should keep that in mind - and avoid turning the garden into a spa retreat for bloodsucking pests without realising it.

Lemon-scented geranium: the natural double defence

Many people instinctively reach for insect sprays for skin and clothing. Those products certainly have their place, but few of us want a permanent cloud of chemical active ingredients hanging over the garden. A much gentler option is now being talked about as a secret weapon against ticks and mosquitoes: the lemon-scented geranium, often sold as a scented pelargonium with a lemony fragrance.

It grows into dense, bushy clumps around 40 to 100 centimetres tall. The foliage is typically soft, green and deeply cut. When you rub a leaf between your fingers, a strong citrus scent is released - pleasantly fresh for people, but much less welcome to many insect species.

The repellent effect comes from the leaves, which contain aromatic compounds such as geraniol and citronellol. Manufacturers have used these substances for years in candles, sprays and room diffusers to keep biting mosquitoes away.

If you brush past the plant on the way to the seating area or patio door, the scent is released again and again without any extra effort. Several pots placed where people naturally walk also help to spread the aroma more evenly than a single plant tucked away in a corner.

Studies show that high concentrations of geraniol can significantly reduce tick bites and drive away a noticeable share of mosquitoes outdoors.

Realistically, the plant does not create a magical protective wall. If you sit right beside a lake or push through long grass in the evening, you will still be a target. But around the house, on the terrace and on the balcony, a ring of these fragrant plants can clearly reduce the overall insect load - and that is exactly what matters in everyday life.

How to place lemon-scented geraniums correctly

In central European gardens, lemon-scented geraniums usually do not survive winter outdoors, because they are sensitive to severe frost. That is why growing them in pots works best. It also has a further advantage: you can move the plant exactly where you need protection.

The ideal spot

• A full sun to partial shade position, preferably bright and warm
• A well-drained, fairly open growing medium in the container
• A pot with drainage holes so waterlogging does not develop
• Close to seating areas, doors and paths you use often

Plant or pot up the lemon-scented geranium in spring as soon as the nights are mostly frost-free. A nutrient-rich but airy compost - for example, good-quality multipurpose compost mixed with a little sand - will support it well. A few pots along the edge of the terrace, near the garden bench or on either side of the sliding patio door create a kind of fragrant barrier.

Before a barbecue or a relaxed glass of wine outside, you can gently rub a few leaves between your fingers. That briefly intensifies the citrus scent in the air.

For exposed spots, placing several pots together near a warm wall can help the fragrance linger longer on still evenings. Because the plant stays in a container, you can also shift it towards the sun during the day and bring it nearer to the seating area in the evening.

Everyday care

The plant does not need complicated attention, but it does appreciate a few basic rules:

• Water regularly, but never keep the roots constantly wet
• Feed lightly every two to three weeks during the main growing season
• Trim back spent shoots a little so the plant stays compact
• Protect it from frost in autumn and overwinter it somewhere bright but cool

Anyone without a suitable place to overwinter it can treat the lemon-scented geranium as a seasonal plant and replace it the following spring. Cuttings are easy to take: a non-woody shoot, stripped of leaves at the lower end and inserted into seed-starting compost, will usually root fairly quickly.

If you want to keep the plant especially bushy, pinch out the growing tips occasionally. That encourages denser growth, increases the number of scented leaves and helps the pot look full rather than sparse.

Direct use: leaf on the skin, oil in a diffuser?

Many garden lovers go a step further and use the fragrant leaves directly. One option is to crush one or two leaves very slightly and rub the juice carefully onto clothing or shoes. That creates an extra scent barrier without covering the whole skin with spray.

If you have sensitive skin or are prone to allergies, test it on a small area first. Any redness or itching is a clear sign that the plant sap should not be applied more widely.

Lemon-scented geranium essential oils are also sold commercially. They are often used in:

• Plug-in diffusers for indoor spaces
• Scent lamps on the terrace
• Homemade sprays mixed with plant oils

Anyone using those products should keep children, pregnant women and pets in mind. Essential oils are highly concentrated and should never be applied undiluted to the skin or used close to mucous membranes.

What the plant can do - and what it cannot

Lemon-scented geranium helps to reduce the number of insects around the home, but it does not replace sensible precautions. When it comes to ticks, it remains important to check legs, arms and especially the backs of the knees after spending time in long grass or undergrowth. For pets, extra tick protection as advised by a vet is also worthwhile.

At the same time, spending a few minutes a week on garden hygiene can make a noticeable difference to mosquito numbers:

• Empty saucers regularly or fill them with a little sand
• Fit rain barrels with tightly closing lids
• Avoid leaving watering cans half full for long periods
• Turn over toys and buckets after rain

The fragrant plant works best as part of a broader package of good habits and targeted planting around the house.

Many garden owners combine lemon-scented geranium with other strongly scented herbs. Lavender, lemon balm, catmint and certain thyme varieties also carry aromas that mosquitoes tend to dislike. The result is a “scent belt” that not only looks attractive but also works practically.

A flowerpot arrangement like this is especially useful near windows, doors and outdoor dining spaces, because those are the places where people most want relief from biting insects. Instead of relying on one measure alone, you build several small deterrents into the same area.

More than just insect defence

Apart from its repellent effect, lemon-scented geranium has other advantages. Its fragrance gives the terrace a distinctly Mediterranean feel that can be reminiscent of a holiday. Anyone who enjoys crafting or gardening can dry the leaves and sew them into scented sachets to keep linen cupboards smelling fresh.

It also looks attractive. Depending on the variety, the plant may produce delicate pink, white or violet flowers that draw in the insects we do want to see in the garden - such as wild bees and hoverflies. That creates a small balance: beneficial insects get their nectar, while biting mosquitoes and ticks are encouraged to keep their distance from the strongly scented leaves.

If you only have a small amount of space, you can grow lemon-scented geranium in a balcony box alongside classic summer bloomers such as petunias or verbena. That way, the planter does not look like a purely defensive project; it stays decorative and versatile. City balconies, in particular, benefit from this blend of beauty and function.

For families with children, the plant can also become a small nature project: what does a leaf smell like in the morning, and what about in the evening? Which insects still appear when several pots are standing by the seating area? Simple observations like these are an easy way to show how powerfully scents work in the garden - and how you can keep a few troublesome insects at bay with straightforward methods.