Clever grandma’s tip: Use three kitchen herbs to keep spiders out.

Our grandparents had a remarkably simple answer to spiders indoors.

They didn’t rely on sprays or pricey traps. Instead, they lined the windowsill with modest plant pots - and spiders tended to steer well clear of the house. What was once common knowledge gradually faded, but the old trick is now making a comeback. It suits modern life perfectly, especially for anyone keen to avoid toxic household chemicals.

Old farmhouse trick instead of poisonous spray

In DIY stores and supermarkets, you’ll find shelves stacked with insect sprays and “anti-spider” products. They promise fast results, but they can be expensive - and much of what you use ends up lingering in the air you breathe. Many of these treatments can also harm helpful insects and add to environmental pollution.

Earlier generations took a different approach: strongly scented plants placed right by the window. The principle is straightforward. Certain herbs release aromatic compounds that spiders and other crawling insects prefer to avoid. To us, those scents are pleasant; to spiders, they form a kind of scent wall.

Lavender, mint and basil on the windowsill act like an invisible fence - with no chemicals at all.

So it wasn’t just geraniums on the sill. Three herbs, still easy to buy from any garden centre today, were the favourites: lavender, mint and basil. Each brings its own strengths, and together they create a surprisingly effective protective ring around the window area.

Spring is the best time to set up spider-repellent herbs on the windowsill

The period from late March through April is considered ideal for placing your herb pots on the windowsill. Days are getting brighter, sunlight has more strength, and the extreme heat of summer hasn’t arrived yet. Young plants get plenty of light without being scorched or drying out too quickly.

• Plenty of light: Spring sunshine supports strong growth in young herbs.
• Milder temperatures: Roots aren’t yet stressed by stifling heat.
• Head start on spider season: When spiders become more active, your scent wall is already in place.
• Best choice in shops: Garden centres are typically stocked with robust young plants at this time.

It also helps to choose pots that match your window conditions. A warm, south-facing windowsill may need slightly larger pots so compost doesn’t dry out too quickly, while cooler, north-facing windows often benefit from placing herbs as close to the light as possible.

A few minutes of effort now can give you a living barrier all summer long - plus fresh herbs for cooking.

Lavender: the fragrant window guardian

How lavender confuses spiders

Many people know lavender from holidays in the south of Europe or from scented sachets in wardrobes. Those attractive flowers contain a potent mix of essential oils, which steadily disperse into the air around the pot.

For spiders, that smell is highly unpleasant. Their sensory systems are very sensitive to strong aromas. Intense lavender scent can mask the cues they use to navigate, making it harder for them to “read” where it’s safe to walk or build a web - so they often turn back.

How to keep lavender happy in a pot

To thrive on a windowsill, lavender needs one thing above all: dry feet. It really dislikes waterlogging.

• Use a pot with a drainage hole.
• Mix compost with sand or perlite so water drains freely.
• Water only when the surface feels genuinely dry.
• A bright, sunny spot by the window is ideal.

If you give lavender a light trim once a year, it stays compact and bushy - which helps strengthen its scent output.

Mint: a fresh, powerful deterrent on the windowsill

Why the menthol scent works so well

Mint smells noticeably stronger than lavender. Its familiar menthol aroma is immediate, cool and fresh. The leaves contain a high concentration of aromatic oils that are released with the slightest touch - or even with a small draught from an open window.

For spiders, it’s simply overwhelming. The dense cloud of scent acts like an invisible restricted zone they prefer to avoid. If you place several mint pots close together, you can create a real protective belt along the full length of the windowsill.

Keeping mint vigorous without it taking over

Mint grows quickly and loves to spread through its roots. In garden beds it can crowd out other plants, but on a windowsill it’s easy to control.

• Keep mint in its own pot, not planted with other herbs.
• Choose a fairly deep pot, at least 20 cm.
• Keep the compost slightly moist; don’t let it dry out completely.
• Harvest regularly - this slows rampant growth and encourages fresh shoots.

A pleasant bonus: those harvested leaves can go straight into tea, homemade lemonade, or a light summer dessert.

Basil: a kitchen favourite with a hidden anti-spider effect

More than a garnish for pasta and pizza

Basil is the classic “pasta herb”, and its soft, richly green leaves also contain aromatic oils. They don’t just smell delicious - they can disrupt plenty of small crawling pests, too. In particular, ground-level insects and some spider species avoid basil’s distinctive, slightly peppery scent.

Combined with lavender and mint, basil adds a third “scent note”. This mix of aromas makes it even harder for spiders to orient themselves; the overall smell profile is too changeable and unsettling.

Keeping basil strong and fragrant for longer

To stop basil fading after a few weeks, it needs a bit of consistent care:

• Bright location, but not harsh full sun - avoid intense midday heat if possible.
• Keep compost evenly moist; don’t allow water to sit in the saucer.
• Pinch out shoot tips regularly before flowers form.
• Cut whole stems rather than plucking single leaves.

This keeps the plant bushy, encourages lots of fresh leaves, and provides a steady supply for both your cooking and your scent wall at the window.

How to combine the “three-herb defence” properly

The best layout on the windowsill

You’ll get the strongest effect when all three herbs are positioned together by the same window. Their scents complement one another and cover a wider area. A typical arrangement might look like this:

Position	Plant	Function
Left	Lavender	Base scent; steady shielding through essential oils
Middle	Mint	Intense menthol hit; strong deterrent effect
Right	Basil	Spicy layer; particularly useful against ground-level crawlers

If you have a wide windowsill, you can repeat this pattern. What matters most is keeping the gap between any open window space and the pots as small as possible, so spiders meet the scent wall first.

To refresh the aroma on still days, you can gently rub or pinch a few mint and basil leaves (without stripping the plant). This releases more essential oils and can boost the “invisible fence” effect.

Practical tips and the limits of the method

As natural as this approach is, a few practical points are worth remembering. Heavy rain outdoors can temporarily reduce scent strength, especially if the herbs are exposed directly to downpours. A sheltered spot under a small overhang can help.

Anyone with sensitive skin should wear gloves when repotting, as some herbs release oils that may irritate. If you have young children or pets, it’s sensible to check whether they like nibbling plants - not every herb suits every animal equally well.

If you’re dealing with a particularly severe spider problem, pair the herb strategy with other gentle steps:

• Fit insect screens to windows.
• Vacuum room corners regularly.
• Remove old webs.
• Seal cracks and gaps in brickwork, frames and skirting boards.

More benefits than just spider control

These aromatic pots bring extra advantages, too. They improve the look of any frontage, smell lovely when you ventilate the room, and encourage more fresh cooking - because who doesn’t like snipping a few leaves straight from the windowsill?

Many homeowners report noticeably fewer webs on frames and panes in summer once the herbs are well established. And even if a spider does wander in, it’s usually easy to guide it back outside because far fewer settle in the first place.

In the end, it’s a simple idea: with a few inexpensive pots and classic kitchen herbs, you can revive a traditional home remedy. The result is a home that smells fresh, windows that stay cleaner - and far fewer eight-legged visitors in your living space.