How Often Should You Replace Diffuser Reeds? (And Which Reeds to Buy)

Reed diffusers are one of the easiest ways to keep your home smelling lovely, but the reeds don't last forever. Over time they clog with oil and dust, and the scent fades even when there's plenty of fragrance left in the bottle. The good news is that fresh replacement reeds for diffusers are inexpensive and bring an old diffuser straight back to life. This guide explains how often to flip and replace your reeds, which type to choose, how many to use and how to refill your diffuser properly.

How reed diffusers work

Each reed is full of tiny channels that run from end to end. The fragrance oil travels up these channels and evaporates from the tips, releasing a steady scent into the room. That's why the condition of your reeds matters so much: when the channels are clear, the oil moves freely and the scent is strong. When they clog, the oil stops travelling and the fragrance fades.

Signs your reeds need replacing

• The scent has faded, even though there's still oil in the bottle.
• The tops look dark and saturated, or the reeds feel sticky and heavy.
• Dust has settled on the tips, which blocks the oil from evaporating.
• You're switching to a new fragrance. Reeds hold on to the old scent, so fresh reeds keep the new one true.
• You've just refilled the bottle. A refill is the perfect moment for a fresh set.

As a general rule, replace your reeds every two to three months, every time you refill the bottle, and whenever you change scent.

How often to flip your reeds

Flipping the reeds puts the oil-soaked ends at the top, which gives the scent an instant boost. Once every week or two is plenty. Flip them more often and the oil evaporates faster, so the diffuser won't last as long.

Flip reeds over a sink or a sheet of kitchen roll. Fragrance oil can mark wooden surfaces and paintwork, so let any drips fall away before you put the reeds back.

Rattan vs fibre reeds

Whichever you choose, pick reeds that are noticeably longer than your bottle so plenty of reed sits above the neck. Roughly twice the height of the bottle is a good guide, and rattan reeds can be trimmed with scissors if they're too tall.

Choosing a reed thickness

Thicker reeds carry more oil, so they give a stronger scent but empty the bottle faster. Thinner reeds give a lighter, longer-lasting scent and suit smaller bottles with narrow necks.

Our picks:

• 2mm Indonesia Reed Diffuser Sticks (approx. 100): slim natural rattan reeds for small bottles and a light, understated scent.
• 2.5mm Indonesia Reed Diffuser Sticks (approx. 100): the versatile middle ground, suited to most diffuser bottles.
• 3.5mm Indonesia Reed Diffuser Sticks (approx. 100): wider natural reeds for a stronger scent and a more substantial look.
• 3mm Fibre Black Reed Diffuser Sticks (approx. 100): sleek black fibre reeds for a clean, contemporary finish.
• Natural Reed Diffuser Sticks, 25cm × 3mm (500g): a generous pack for refreshing several diffusers or making your own.

Shop all replacement diffuser reeds

How many reeds should you use?

More reeds give a stronger scent, but the oil runs out sooner. Fewer reeds give a softer scent that lasts longer. Use this as a starting point, then adjust to suit the room:

• Up to 120ml bottle: 4 to 6 reeds
• 140ml bottle: 6 to 8 reeds
• 200ml bottle: 8 to 10 reeds

In a small bathroom, start with fewer reeds. In a large hallway or open-plan living space, add a couple more.

How to refill a reed diffuser

1. Remove the old reeds and set them aside on kitchen roll.
2. Check what's left. If you're sticking with the same fragrance, you can top up the remaining oil. If you're changing scent, pour out any leftover oil and rinse the bottle with warm soapy water, then let it dry completely.
3. Pour in the refill oil using a small funnel if the neck is narrow. Fill to about two-thirds full.
4. Add fresh reeds, then wait a few hours for the oil to travel up before judging the scent.
5. Flip the reeds once after a day to get the fragrance going.

Always use oil made for reed diffusers. Pure essential oil is too concentrated and doesn't travel up the reeds in the same way.

Our picks (Agnes + Cat refills, 140ml):

• Fresh Citrus: bright lemon with a clean, airy finish. Crisp and light for a kitchen or bathroom.
• Sea Salt & Moss: fresh coastal notes with sage and grapefruit over musk and amber. Airy without being sharp.
• Provence: fresh herbs and lavender softened by warm amber. Quietly elegant for a living room or home office.
• White Fig: creamy fig with gentle woods and musk. Soft and mellow in a bedroom.
• Moroccan Roll: neroli and lemon moving into rose, jasmine and cedarwood, for a scent with more depth.

Shop all reed diffuser oil refills

How to make the scent last longer

• Keep it away from heat and sunlight. Radiators, sunny windowsills and hot kitchens make the oil evaporate faster.
• Find gentle airflow. A hallway or near a doorway spreads the scent further than a closed corner.
• Don't over-flip. Once every week or two is enough.
• Use fewer or thinner reeds if you'd rather have a subtler scent that lasts longer.
• Keep the cap. If you go away, put the reeds aside and cap the bottle to save the oil.

Try diffuser flowers instead of reeds

For a more decorative look, swap some or all of your reeds for handmade sola wood diffuser flowers. The fragrance travels up to the petals, which release the scent while turning your diffuser into a small floral display. They come in two styles:

• Flowers on reeds sit on a reed stick, so they draw up the oil just like your other reeds and mix in easily with them.
• Flowers on string use a cotton string instead of a stick, which gives a softer, more natural look, with the flower resting on the neck of the bottle.

Our picks:

• Rose on Reed: a classic handmade rose to crown a bundle of reeds.
• Tulip on Reed: a simple botanical finish for a shelf or side table.
• Large Lotus on String: broad, layered petals that make the flower the focal point.
• Small Poppy on String: an open, relaxed flower for a smaller bottle.

Shop all natural diffuser flowers

Starting fresh? Our ready-to-use reed diffusers

If your old diffuser has run dry, our 120ml reed diffusers come ready to go:

• Lavender Fields: fresh lavender and green herbs over chamomile, cedarwood and soft musk. A classic for the bedroom.
• Gooseberry & White Tea: crisp and understated, ideal for a bathroom.
• Heavenly Musk: soft powder and white musk with amber, vanilla and sandalwood for a warm, subtle scent.

Shop all reed diffusers

Still deciding between a reed diffuser and something else? Read our guide to electric diffusers vs reed diffusers vs oil burners.

Frequently asked questions

Can you reuse diffuser reeds with a new scent?

It's best not to. Reeds hold on to the previous fragrance, which will mix with the new oil and change how it smells. Fresh reeds keep the new scent true.

Why has my reed diffuser stopped smelling?

The most common reasons are clogged reeds, low oil or a spot with no airflow. It can also be that you've simply got used to the scent: after a few days, your nose tunes out a smell it meets all the time, even though visitors still notice it. Try flipping the reeds, moving the diffuser, or replacing the reeds if they look dark and saturated.

What thickness of reed should I use?

For most bottles, 2.5mm to 3mm reeds are a good all-rounder. Choose 2mm reeds for small bottles or a lighter scent, and 3.5mm reeds when you want a stronger fragrance in a larger room.

How long does a reed diffuser last?

It depends on the bottle size, the number and thickness of the reeds, how warm the room is and how often you flip them. With a moderate number of reeds in a room away from heat, a 120ml to 200ml bottle will typically last several weeks to a few months.

Can I use diffuser flowers instead of reeds?

Yes. Diffuser flowers on reeds draw up the oil just like ordinary reeds, and flowers on string use a cotton string to do the same job. You can use them on their own or mixed with reeds for a more decorative look.