At Essence of Harris, we make our reed diffusers on the Isle of Harris, in a small factory in Tarbert, using natural fibre reeds and fragrance oils we've developed to carry the character of specific Harris beaches and locations. We've been making them since 2015.
The questions below are the most frequently asked questions on the topic of reed diffusers, how to use them, where to place them, and how to make the most out of them. Let’s dive in.
What is a reed diffuser and how does it work?
Reed diffusers are one of the simplest ways to add fragrance to a room. Reeds sit in a glass bottle of scented oil. The oil travels up through the reeds by capillary action, the same process that pulls water through plant stems, and evaporates from the exposed tips into the air around them.
Unlike candles, they're flame-free and need no heat. They disperse scent naturally and continuously, which means no soot or fire risk, and no need to remember to switch anything off.
Our diffusers use natural fibre reeds which are innovatively designed for a consistent fragrance throw along the full length of the reed. The porous internal structure draws oil steadily from the bottle and releases it at a controlled rate.
How do I set up a reed diffuser?
Setting up takes about two minutes. Simply remove the stopper from the bottle, place your reeds into the oil, and let them sit for ten minutes so the bottom ends can absorb.
Once absorbed, flip them so the saturated ends point upward. That first flip speeds up the initial diffusion and means you'll notice the scent within 24 hours rather than waiting a couple of days.
Before you do any of that, put something under the bottle, like a coaster, a small tray, or a folded piece of kitchen paper. Oil runs down the outside when you flip the reeds, and it may leave a permanent mark on wood, stone, or painted surfaces.
How many reeds should I use?
The number of reeds in the bottle affects how strong the scent is and how quickly the oil gets used up.
Fewer reeds produce a lighter, more background scent, and the oil lasts longer. More reeds give a stronger throw, but you'll go through the bottle faster.
We’ve done the testing for you, so each diffuser comes with the optimal number of reeds for the best balance of scent and longevity. We recommend using all of the reeds provided to experience the fragrance as intended.
If the scent seems to be disappearing within a few weeks rather than months, take a couple of reeds out. It's the single most effective thing you can do to extend the life of your diffuser.
Where should I place my reed diffuser?
Scent needs air movement to travel. A doorway or hallway works well because people walking past create enough disturbance to carry the fragrance around. A completely still corner will trap it around the bottle.
Height helps too. Fragrance molecules disperse downward, so a shelf or chest of drawers at roughly waist height will scent a room more evenly than something sitting at floor level. A mantelpiece works well, so long as it's away from direct sunlight.
Another point to remember is to keep your reed diffuser away from radiators, sunny windowsills, and warm appliances. All of these cause the oil to evaporate much faster than it should naturally, and you'll burn through the bottle in weeks rather than months. A cool, shaded spot will always last longer.
Bathrooms are actually one of the better spots for a diffuser, because the humidity helps carry the scent. If your aim is to give visitors a good first impression, position one in your hallways so it's the first thing they notice.
For bedrooms, a softer scent works best, like our Losgaintir reed diffuser, which combines bergamot, white tea, and coconut with almond, vanilla, and amber to provide a relaxing scent.
For kitchens and living areas where you want something that cuts through cooking smells, the Horgabost reed diffuser combines zesty Sicilian lemon and lemongrass with the revitalising kick of ginger root.
How often should I flip the reeds?
Flipping the reeds gives the diffusion a boost. When the exposed ends dry out or the scent has faded a little, turning them over so the saturated ends face upward draws fresh oil to the surface.
Once or twice a week is enough. Every day, you're just burning through the oil. Too rarely and the exposed ends dry out and stop releasing much fragrance at all.
Just remember to do it over a sink, or at least over your coaster, as a little oil always drips.
How long does a reed diffuser last?
Several things can affect how long the oil lasts, from room temperature, number of reeds to whether windows are usually open, and whether there's central heating or air conditioning running nearby. Both heating and cooling systems increase evaporation.
Our 175ml diffuser should last roughly four months with moderate use in a normal home. With our limited edition 100ml diffusers last around two months.
If yours is emptying much faster, check it's not near a heat source and try reducing the number of reeds.
What should I do when the scent fades?
If there's still oil in the bottle, but you can barely smell anything, three things could be happening.
The first is that you've simply got used to it. This is called 'olfactory adaptation', where your nose stops registering a constant background smell after a while. The diffuser is almost certainly still working. Ask someone who's just come in from outside to tell you what they notice.
The second cause is that the reeds have become saturated or clogged with dust. Over time the channels inside can get blocked and no longer draw oil up properly. A very gentle swirl of the bottle can help blend the oil and temporarily strengthen the scent.
If that doesn't work, flip the reeds for a short-term boost. But if the reeds have been in use for several months, it may be time to replace them.
A new set in a part-full bottle can make a diffuser smell almost as strong as it did on day one. We suggest replacing the reeds after your first refill.
The third is simply time. Fragrance oil can diffuse slightly faster than the base oil, so towards the end of the bottle the scent may feel softer even if liquid remains. If you’re around the four-month mark and the fragrance has noticeably faded, it’s a good sign it’s time for a refill.
Can I top up my diffuser with a different scent and use the same reeds?
No. The fragrance already absorbed into the reed will mix with the new oil and produce something you almost certainly didn't intend.
If you're switching scents, we recommend replacing the reeds to enjoy the new scent as intended. Fresh reeds are provided with each refill, and all of our refill oils are designed to work perfectly with your existing bottle.
I've topped up my diffuser, do I need new reeds?
Not necessarily, if the reeds are still working and you've refilled with the same scent. But if they've been in use for more than six months, seem completely saturated, or have stopped diffusing even after flipping, they've probably become clogged. Replace them. Fresh reeds in a freshly topped-up bottle will perform noticeably better than old ones that can no longer draw oil properly.
Are reed diffusers safe around pets and children?
Unlike candles, reed diffusers have no flame, no hot wax, and no exposed element, meaning they are much safer in homes with children or pets.
The fragrance oil is a different story. If it tips and spills, it can easily stain or damage surfaces, or irritate sensitive skin. The best advice is to keep the bottle somewhere stable and well out of reach.
If you have cats, you may want to think about reed diffusers before purchasing. Cats have very sensitive respiratory systems and limited ability to process certain compounds. If you have cats, make sure the room is ventilated and watch for signs of irritation, such as excessive sneezing, watery eyes, or uncharacteristic avoidance of a room. If you notice any of that, move the diffuser or reduce the number of reeds.
Birds are more sensitive still, so we'd suggest keeping diffusers out of rooms where birds spend a lot of time.
The oils are formulated for domestic use in ventilated spaces. They're not food products, and none of it should be ingested. Treat them as you would any household product that comes with a warning label, and they're fine for everyday use.
Can I use a reed diffuser in my bedroom overnight?
Yes. There's nothing to switch off, nothing to check, no heat source. Place it away from the bed itself, keep the room reasonably ventilated, and choose a scent that suits sleep rather than stimulation.
A lighter background fragrance is usually more pleasant for sleep than a strong one anyway.
How should I choose the right scent for each room?
There's no rule you have to follow. But some patterns are worth knowing.
Lighter, fresher scents tend to work better in kitchens and bathrooms. Our Horgabost (lemongrass, lemon and ginger) and Huisinis (pink pomelo, grapefruit and rhubarb) are the best in those spaces, as they cut through cooking smells and feel clean without being sharp.
Warmer scents suit living rooms and bedrooms. Losgaintir (coconut, bergamot and vanilla), Adru (sandalwood, wild nettle and musk), and Seilebost (black pomegranate and plum) tend to fill a room with something that feels more like an atmosphere than just a smell.
Our classic scents are named after real places on Harris. Losgaintir is the long white beach on the west coast, Seilebost sits nearby on the same bay, and Huisinis is at the tip of a headland that takes a while to reach.
The scents were developed to carry something of those specific places. Whether or not you've been to Harris.
What's the difference between a reed diffuser and a candle?
We make both, so we'd say there's room for each of them, but they do different things.
A diffuser works in the background without you having to do anything. It's not something you notice you've lit, because you haven't. You just walk into a room, and it smells good. That makes it well suited to somewhere you want to feel welcoming without having to think about it.
A candle is more of a deliberate thing. You light it when you're home, when the room is in use, and the scent tends to be more immediate and noticeable for it. There's also the relaxing charm of the flame as it dances on the wick that a diffuser can’t replicate.
As both have their charms, a lot of our customers use both. The diffuser runs through the week, and the candle comes out in the evening. Because we make them in the same scents, they layer together rather than compete, which is really how we intended them to be used.
Bring a little of Harris home
Our factory is in Tarbert, a small town on the east coast of Harris, less than two hours by ferry from the mainland. Jamie and Deenie McGowan started the business in 2015, wanting to turn specific Harris places into specific Harris scents.
If you've visited the Outer Hebrides, you'll know what we mean. If you haven't, we'd say the scents are a reasonable case for going.
Our reed diffusers come in a range of scents, with refills and replacement reeds so the bottle can stay with you as long as you want it.
Shop our reed diffusers | Browse by scent | Explore our refills
Updated April 2026
