This Old Trick Keeps Spiders Away With Lavender, Mint and Basil

This old trick is currently making a comeback.

As temperatures rise and windows are left open for longer, the same issue appears in many homes: eight-legged visitors begin looking for dark corners, frames and curtain rails. Rather than immediately reaching for a can of pesticide spray, more and more people are turning to a remarkably simple traditional method that uses no chemicals at all – plants that are familiar from almost every kitchen.

Why Grandma’s windowsill rarely had spiders

Before supermarket insect sprays existed, people made use of what the garden provided. Many windowsills held particular terracotta pots, arranged closely together: strongly scented herbs. Their purpose was straightforward – to create an invisible barrier of fragrance.

Classic culinary herbs such as lavender, mint and basil of all things release scent compounds that actively drive away spiders and many other crawling creatures.

Although people tend to find these aromas pleasant or calming, they overwhelm spiders’ highly sensitive sensory organs. The creatures consistently avoid such areas and move elsewhere – preferably outdoors.

Three herbs that spiders dislike

Lavender: a scented cloud for unwanted visitors

Lavender has long been valued for its soothing qualities. It contains powerful essential oils that release an intense fragrance. This is precisely what creates its protective effect around windows and doors.

To spiders, these aromatic clouds are a source of stress. Their delicate sensors become overstimulated, so they can no longer orient themselves or hunt properly. As a result, they turn away before reaching the home.

For lavender to perform well on a windowsill, it chiefly needs:

• very free-draining compost, such as a mix of potting compost and sand or perlite
• the brightest possible position with plenty of light
• little water – only water once the surface of the compost has dried out

Placing several pots in a row makes the fragrant barrier noticeably stronger. Lavender is particularly attractive on south-facing windows, where it works around the clock as a natural “bouncer” as well as looking good.

Mint: a fresh scent with a powerful effect

Mint is invigorating for many people but tends to deter spiders. Its leaves are rich in menthol, which continuously releases tiny scent particles into the air. For spiders, this makes the surroundings feel overstimulating and unsafe.

One particular benefit is that mint is more forgiving of care mistakes than many other herbs. Following a few basic principles will quickly produce a dense, fragrant pot beside the window.

Mint kept in its own pot remains manageable – and turns the window frame into an invisible boundary that spiders are reluctant to cross.

It is important not to plant it in the same container as other herbs. Mint produces vigorous spreading roots that can otherwise crowd out weaker neighbours. The better option is:

• one separate, deep pot, around 20 cm deep
• humus-rich compost kept lightly moist
• a bright spot away from constant blazing sunshine

Anyone who wishes can pick a few leaves now and then for tea or cocktails. The aroma remains, while the plant branches more vigorously and becomes even denser.

Basil: a kitchen favourite that doubles as a “guard”

Almost everyone knows basil from tomato salad. Less widely known is that its essential oils significantly irritate many crawling creatures. Its gently peppery, spicy scent complements the fragrance combination of lavender and mint perfectly.

Choosing the right spot determines whether basil stays strong or wilts quickly. It enjoys warmth and brightness, but cannot cope with relentless midday sun through glass.

Factor	Recommendation for basil
Light	bright and warm, without prolonged midday heat
Water	water regularly and keep the compost slightly moist
Care	pinch out tips regularly and remove developing flower buds

Regularly pinching out the growing tips encourages bushier growth. This produces more leaves – and more fragrance to keep spiders away.

The ideal time to start herb pots

The period around late March and early spring is especially suitable. The sun becomes stronger, days lengthen, and plants begin growing in earnest without immediately being scorched by summer heat.

Anyone who fills their windowsill with lavender, mint and basil in spring builds the fragrance barrier before the main spider season begins.

Young plants from a garden centre or DIY shop can be transferred straight into decorative pots. Drainage holes in the base are essential so that water does not collect. On narrow windowsills, long planters work well for lavender and basil side by side, while mint should have a pot of its own.

Creating a continuous protective line at the window

Arranging the pots on the windowsill

For this old windowsill trick to work, the density of the plants matters most. Single isolated pots spaced 60 cm apart achieve only a limited result. The aim is to form a more or less uninterrupted green boundary directly beside the frame.

The following arrangement has proved practical:

• one pot of mint on each side of the window
• one or two pots of lavender in the centre
• one pot of basil in front of, or between, them

This allows the different scents to overlap, making the area immediately in front of the opening as unappealing to spiders as possible. At the same time, the result remains light and welcoming in appearance – unlike sticky traps or nets.

Benefits compared with chemical products

Insect sprays are convenient, but they also bring several drawbacks: irritating vapours in indoor air, residues on surfaces and repeated costs with frequent use. Herbs on the windowsill work more quietly, but continuously.

The main everyday advantages are:

• no toxic mist indoors
• a pleasant fragrance rather than a chemical smell
• fresh herbs on hand for tea and cooking
• a more attractive façade and interior

Many households also report that ants and other small crawling creatures, not only spiders, appear less often around windows.

What to know about spiders and fragrances

Spiders are unpleasant for many people, yet they play an important role in the ecosystem because they eat flies and other insects. The herb trick does not kill them; it simply repels them. The animals just choose a quieter location.

Its effect comes from fragrance compounds, specifically essential oils. These substances occur in highly concentrated form in leaves and flowers. Heat and moving air – for example, a light draught through a tilted-open window – increase the effect because more fragrance is carried both indoors and outside.

Anyone particularly sensitive to strong scents should begin with smaller quantities and see how the atmosphere in the room changes. Lavender in particular can smell powerful when several pots stand close to a living-room or bedroom window.

Practical extra tips for a home with fewer spiders

Herb pots work best when they are supported by a few straightforward household habits. Spiders favour dust, dark corners and undisturbed spaces.

• Wipe window frames regularly, both inside and outside.
• Remove old webs completely rather than merely tearing them down.
• Seal cracks and gaps around frames, roller-shutter boxes and joints.
• Do not place light sources directly beside an open window in the evening.

If the pots are also rearranged occasionally, dry leaves are removed and the herbs are kept young by pruning, the benefits are doubled: fewer spiders and a lively green window display that visibly enhances any home.