Lemongrass Insect Repellent: Do Citronella & Lemongrass Oils Actually Work? UK Guide 2026

A lemongrass insect repellent is the easiest thing in the world to be disappointed by — not because the oils do nothing, but because most people apply them expecting the several-hour performance of a DEET or picaridin product. Set your expectations around a shorter, more frequent reapplication routine and a botanical spray becomes perfectly useful: pleasanter on skin, kinder to sleeping bags and tent fabric, and genuinely effective for a garden evening or a short walk. Set them around “one spray at dusk and forget it” and you will conclude, wrongly, that the whole category is snake oil.

The differences between bottles are mostly differences in formulation and legal positioning, not in magic. This guide covers what lemongrass and citronella oils actually do at the sensory level, what the published protection-time figures really say, why UK midges and ticks need a different answer from Aedes mosquitoes, and how GB regulation shapes what a UK bottle is even allowed to claim. Four products are covered in detail, with hedged approximate pricing.

Editorial note: this guide is compiled from published research, manufacturer INCI and specification documentation and named third-party sources. No hands-on testing was carried out, and no product here has been laboratory-tested by us.

Quick picks

Every price in this article is an approximation. This category moves constantly, and UK retailers frequently differ from one another on the same bottle.

How lemongrass and citronella repellents actually work

Same grass family, different oils

Lemongrass (Cymbopogon citratus) and citronella (Cymbopogon nardus and Cymbopogon winterianus) are closely related grasses, and the oils pressed from them are chemically similar — but not identical. Lemongrass oil is dominated by citral, a mixture of two isomers, geranial and neral. Citronella oil leans instead on citronellal, geraniol and citronellol. East Indian lemongrass, Cymbopogon flexuosus, is a third species you may see on a label.

The chemistry matters because insects detect these compounds at very low concentrations and, for reasons that are still not fully settled, tend to avoid them. In the entomological literature, citral is associated with activating insect TRPA1 channels and with modulating odorant receptor signalling — that part is established, but the exact binding pathway remains debated. In plain terms: the oil interferes with how an insect reads the chemical cues coming off your skin.

Deterrence, not insecticide

This is the single most important distinction in the whole category. The effect is masking and deterrence only — not insecticidal. A lemongrass spray does not kill the midges circling your head; it makes you a harder target to find, for a while. That has one practical consequence above all others: because the mechanism is sensory rather than toxic, it fades as the volatile oil evaporates off your skin, and it fades quickly.

It also means wind and sweat work against you. A breeze disperses the vapour barrier that is doing the work, and sweat accelerates evaporation. This is why the same bottle that performed beautifully on a still evening in the garden can feel useless an hour into a sweaty climb.

How long does lemongrass repellent actually last?

This is where marketing and evidence part company, and where the research is unusually clear-cut.

Fradin & Day, published in the New England Journal of Medicine in 2002, measured citronella-based products under controlled laboratory conditions against Aedes species mosquitoes. Those products delivered approximately 20 minutes of complete protection time (CPT) — the interval before the first confirmed bite. Under the same controlled conditions, products containing 20–23% DEET stretched to several hours. Twenty minutes versus several hours is not a formulation quibble; it is the difference between a top-up product and a set-and-forget one.

Nor is that a lone result. A 2018 comparison of plant-based repellents in the Journal of Insect Science found that some botanical products returned effectively zero complete protection time — that is, no measurable window at all before bites occurred. The lesson is not that every botanical fails, but that the category is far more variable than the label suggests.

One plant-derived active is the exception. PMD (Oil of Lemon Eucalyptus, from Corymbia citriodora) is the only plant-derived repellent active with both CDC and WHO endorsement, and its reported complete protection time is comparable to low-concentration DEET. If you want a botanical-adjacent repellent that behaves like a synthetic, PMD is the one to look for — and note that it is a purified compound, not a bottle of essential oil.

The comparison at a glance

The practical translation for a buyer: a lemongrass or citronella spray is a reapply-every-45-minutes-to-two-hours product, not a once-a-night product. Plan around that and the results stop being disappointing.

Why UK midges and ticks need a different answer

Everything above is mosquito literature, and UK biting insects do not read mosquito literature.

Midges. The dominant UK biting midge is Culicoides impunctatus, and its behaviour differs from Aedes mosquitoes in ways that matter — flight activity, host-seeking patterns and the times of day it bites. Most published repellent research is mosquito-based, so extrapolating from an Aedes study to a Scottish lochside at dusk is a leap. On the UK evidence, picaridin — also called icaridin, the same active under two names — outperforms botanicals against C. impunctatus. Two products frequently cited in that context are Smidge, formulated with 20% icaridin and designed specifically for Scottish midges, and Avon Skin So Soft Bug Guard, also icaridin-based. If midges are the actual problem, that is the active to look for.

Ticks. Ixodes ricinus is the UK tick species of concern, and the UK Health Security Agency has confirmed UK Lyme disease cases — its published guidance is the reference point worth reading before you rely on any repellent for tick protection. The National Travel Health Network and Centre (NaTHNaC) recommends DEET or picaridin, not botanicals, for tick protection. Ticks are not a scenario where you want to be experimenting with a short-window essential-oil product.

Three situations, then, where a botanical is genuinely the wrong tool: tick country, high-pressure biting-insect areas (tropical travel, wetland camps in peak season, a Scottish lochside in July at the worst of the hatch), and long active days when you cannot stop to reapply.

How to choose a lemongrass repellent in the UK

Read the INCI list, not the marketing panel. The species name on the ingredient list tells you what you are actually buying: Cymbopogon citratus is lemongrass, C. flexuosus is East Indian lemongrass, and C. nardus or C. winterianus is citronella — the latter sometimes labelled Java citronella. A bottle that says “lemongrass” on the front and C. nardus in the ingredients is a citronella product. That is not a fault, but you should know which one you have.

Check where the oil sits in the list. INCI ingredients are declared in descending order of concentration (below 1%, order becomes flexible). If the Cymbopogon oil appears after a long run of carrier oils and water, the active load is small.

Decide on format. A pump spray covers large areas fast but loses product to drift and wind. A balm stays exactly where you put it, which suits faces, wrists and ankles, and avoids misting your eyes — but coverage is limited to the skin you physically rub.

Watch the allergen declarations. Citral, geraniol and citronellol are all declared fragrance allergens under Annex III of the cosmetics framework, and must appear on cosmetic labels when they exceed the relevant threshold. If you react to fragranced products, that short list is the one to scan.

Match the product to the insect. For a garden evening or a short summer walk, a lemongrass or citronella blend is a reasonable, pleasant choice if you top it up. For ticks, tropical travel or peak midge season, choose an icaridin or DEET product instead.

The GB regulatory angle: why some bottles say “repellent” and others cannot

This is the part almost no competitor guide explains, and it accounts for a great deal of the “it doesn’t work” experience.

In Great Britain, products that make an actual repellent claim may fall under the GB Biocidal Products Regulation, product type 19 (PT19), administered by the Health and Safety Executive. That is a different and more demanding regime than cosmetics. Many essential-oil products, however, are sold as cosmetics under the GB Cosmetics Regulation (the retained EU Regulation 1223/2009 framework) — and cosmetic products cannot legally make repellent claims.

So a bottle can be sold on the strength of its smell, its skin feel and its “natural” positioning, without any obligation to demonstrate that it repels anything. Where a product sits in the law therefore tells you something about what has been substantiated. It is worth checking current HSE guidance on the BPR before relying on a specific product’s claim.

For practical purposes: a garden-category or biocide-positioned product making a repellent claim is operating under a different and stricter set of obligations than a cosmetic oil blend on a shelf that carefully avoids the word “repel”. Neither is necessarily bad — but only one of them has had to justify the claim.

The products

DD Teck Lemongrass & Citronella Spray

Best for: budget buyers, bulk refills and anyone who wants to be generous with reapplication without wincing at the cost.

What you get. A ready-to-use botanical spray whose carrier includes sweet almond oil (Prunus amygdalus dulcis) — relevant if you or anyone you’re spraying has a tree-nut allergy, because almond oil is a tree-nut derivative and belongs on your caution list alongside the essential oils. The standing SKU name is DD Teck Lemongrass & Citronella Spray.

Pricing. Approximately £5–£8 per 100 ml, approximately £14–£17 per 1 litre, and approximately £50–£55 per 5 litre (prices checked in 2026 at ddteck.co.uk and Amazon UK). Those three figures do very different jobs. The 100 ml is the try-it size; the 1-litre and 5-litre formats work out cheaper per millilitre, and that matters more in this category than in most, because a lemongrass spray is a reapply-every-45-minutes-to-two-hours product. Someone doing that on a fortnight of camping will get through the 100 ml quickly.

Standout strength. The bulk formats. For a family camping trip, or for treating a garden seating area, the 1-litre and 5-litre refills make frequent reapplication affordable in a way that small cosmetic-size bottles never are.

Honest caveat. On Amazon UK it is listed under Garden › Repellents, not under cosmetics or pharmaceuticals — a categorisation worth noticing, because a repellent claim is exactly what pushes a product towards the GB Biocidal Products Regulation while cosmetics cannot legally make such claims. Also note the almond-oil carrier, and remember that no botanical spray of this type should be relied on for ticks.

Verdict: the pick if you want volume, a low per-millilitre cost and no pretence of being a luxury skin product.

Where to buy: ddteck.co.uk and Amazon UK.

Incognito Anti-Mosquito Spray

Best for: travel, humid evenings and anyone who wants the reassurance of a natural UK repellent that is stocked everywhere and reviewed at length.

What you get. The best-known natural repellent brand in the UK, widely stocked and widely reviewed by owners — the kind of owner-review consensus that tells you a lot about how a spray smells, sits on skin and behaves in the bottle, and nothing at all about its complete protection time. What matters on the label is the INCI panel: it should name the Cymbopogon species used, and if the active is Java citronella (Cymbopogon winterianus) rather than lemongrass, that is what you need to know before you buy.

Standout strength. Availability and familiarity. It is the botanical that a UK traveller is most likely to find in a pharmacy or outdoor shop before a trip, which counts for something when you need to buy in a hurry.

Honest caveat. Popularity does not extend the protection window. Everything in the efficacy section above applies here: a cite-by-cite read of the research still puts citronella-family oils in the tens-of-minutes range under controlled conditions, against several hours for 20–23% DEET. Treat it as a top-up product, and check the INCI for the species and its position in the list.

Verdict: the natural-refill product to buy when availability and a pleasant application matter more than a long protection window.

Where to buy: typically stocked by UK pharmacies, outdoor and travel-health retailers, and general online retailers — compare stockists, as availability and pricing vary.

Puressentiel Anti-Pique Spray

Best for: sensitive skin and anyone who wants a format designed for frequent reapplication rather than one big application.

What you get. An essential-oil blend in a 75 ml standard size, sold at Boots and Amazon UK. The 75 ml size is the practical detail here: small enough to sit in a daypack or handbag, which is exactly what you want if you are topping up every hour or so rather than applying once. Confirm the INCI panel for its Cymbopogon content before you buy, so you know whether you are getting lemongrass, citronella or both.

Standout strength. The combination of an essential-oil blend and a mainstream high-street route to purchase. It is the easiest of the four to pick up on a Saturday morning in a town centre, and the format suits frequent reapplication.

Honest caveat. Essential-oil blends bring essential-oil considerations: citral, geraniol and citronellol are declared fragrance allergens under Annex III and must appear on the label when they exceed the threshold, so patch-test if you know you are sensitive to fragranced products. And as with every botanical here, the tick and high-pressure midge cases are not what it is for.

Verdict: the high-street option for people who want a small, frequently reapplied essential-oil spray.

Where to buy: Boots and Amazon UK.

Badger Anti-Bug Balm

Best for: faces, wrists, ankles and family use — anywhere a spray would drift, sting or be wasted on the wind.

What you get. A solid balm whose actives the manufacturer lists as citronella, rosemary and wintergreen. Because it is a balm and not a mist, it goes exactly where you rub it and stays there — no overspray, no wasted product carried off on the breeze.

Standout strength. Application control. If you have ever tried to spray your own face, or sprayed into a headwind and watched the mist sail away, the balm format solves a real problem. It is also the easiest format to hand to someone else to apply to your neck and ears.

Honest caveat. Check the INCI panel for Cymbopogon nardus so you know you are getting citronella rather than only the rosemary and wintergreen, and remember that a balm’s coverage is limited to the skin you physically touch — it will not cover the back of a leg you missed. Evaporation still applies, so the reapplication rhythm is unchanged.

Verdict: the format to choose for faces and exposed extremities where a spray is impractical.

Where to buy: typically stocked by natural-health and outdoor retailers, plus general online retailers — check the INCI panel at the point of purchase, since formulations vary.

Why the same bottle works for one person and not the next

If you have ever watched a companion stay bite-free while using the same spray that failed you, the explanation is not in the bottle. Several mechanisms are documented in the entomology literature:

• Individual chemical output. People differ in how much lactic acid they release and in their carbon dioxide and body-heat output — all of which are host-seeking cues for biting insects. A stronger cue plume means an insect needs less help from your repellent.
• Sweat. Sweat accelerates the evaporation of volatile oils, so the vapour barrier that is doing the work disappears faster on some people, and in some conditions, than on others.
• Wind. Air movement disperses the vapour barrier regardless of your individual chemistry — this is why a spray that worked in a sheltered garden can fail on an exposed hillside.
• Species-specific sensitivity. Different insect species respond differently to the same compound. A blend that deters one species well may be far less effective against Culicoides impunctatus or against ticks.

Taken together, these explain why person-to-person and place-to-place variation is normal in a botanical repellent rather than a sign that you bought a dud.

Frequently asked questions

Is it legal for a UK shop to sell a lemongrass spray as an insect repellent? It depends on which regime the product sits under. Products making a repellent claim may fall under the GB Biocidal Products Regulation, product type 19, which is administered by the Health and Safety Executive. Many essential-oil products are instead sold as cosmetics under the GB Cosmetics Regulation, and cosmetic products cannot legally make repellent claims. Check current HSE guidance on the BPR if a specific claim matters to you.

How do I tell whether a bottle contains lemongrass or citronella? Read the INCI list rather than the front label. Cymbopogon citratus is lemongrass, C. flexuosus is East Indian lemongrass, and C. nardus or C. winterianus is citronella — sometimes described as Java citronella. The position of that oil in the list also matters, because ingredients are declared in descending order of concentration.

Will a lemongrass product protect me from ticks? Published UK advice points elsewhere. NaTHNaC recommends DEET or picaridin — not botanicals — for tick protection, and the UK Health Security Agency has confirmed UK Lyme disease cases, so its published guidance is the reference to read. The UK tick species of concern is Ixodes ricinus, and tick country is the clearest case for choosing a synthetic active over an essential oil.

What does a season of lemongrass repellent actually cost? You can reason about it from the refill sizes. A 100 ml bottle of DD Teck Lemongrass & Citronella Spray is approximately £5–£8, the 1-litre format approximately £14–£17 and the 5-litre format approximately £50–£55 (checked in 2026 at ddteck.co.uk and Amazon UK). The bulk formats work out cheaper per millilitre, which matters because a botanical spray is a reapply-every-45-minutes-to-two-hours product — the more often you top up, the more the small bottles cost you.

Does a balm last longer than a spray? Not because of the active — the evaporation that limits a botanical’s window applies to a balm too. The difference is delivery: a balm goes precisely where you rub it, so none of the product is lost to drift or carried away by wind before it reaches your skin. That makes it a better use of what you bought, particularly on faces, wrists and ankles.

I have sensitive skin. What should I look for on the label? Citral, geraniol and citronellol are declared fragrance allergens under Annex III, and must appear on cosmetic labels when they exceed the relevant threshold. Those three are the terms to scan for. Because a botanical repellent is applied to skin and reapplied often, patch-testing on a small area first is sensible, and a balm lets you control exactly how much product you use and where.

The bottom line

Lemongrass and citronella oils are real, they do deter, and they are pleasant to use — but the published figures put them in the tens-of-minutes range under controlled conditions, against several hours for 20–23% DEET, with some botanical products in a 2018 Journal of Insect Science comparison returning effectively zero complete protection time. Buy one expecting to top up every 45 minutes to two hours and you will get on well with it, particularly from a bulk refill at DD Teck prices. For ticks, for peak Scottish midge season and for tropical travel, look instead at picaridin/icaridin or DEET — and check the INCI panel and the HSE’s GB Biocidal Products Regulation guidance before you trust any repellent claim on a bottle.