Diffuser Reeds: The Complete Guide to Choosing Reeds, Base & Fragrance Load (2026)

The Complete Guide to Diffuser Reeds

Rattan vs fibre, DPG vs eco base, and the fragrance load that actually throws — answered in plain language, from a real Australian candle-supply workshop.

TL;DR — the 30-second answer

  • Reeds: Rattan reeds throw more scent but last 2–3 weeks per flip. Fibre reeds throw less but last 6–8 weeks. Most retail diffusers use 8–10 reeds per 100 mL.
  • Base: DPG throws fastest and suits most fragrance oils. Eco base is solvent-free, slightly slower throw, non-flammable, and better for shop displays and export.
  • Fragrance load: 15–25% by weight. Start at 20% for IFRA-safe fragrances. Go to 25% only for weak oils. Under 15% and throw disappears within 2 weeks.
  • Reed count: 8 reeds is the baseline for a 100 mL bottle. Add 1 reed per 20 mL above that, up to a max of 14.

1. What are diffuser reeds?

Reeds are the capillary wick of a reed diffuser. Base liquid travels up the reed by capillary action and evaporates from the exposed surface at the top. Three variables set how fast that evaporation happens:

  1. Reed porosity — how open the internal channels are.
  2. Reed length above the liquid — more exposed surface = faster throw.
  3. Base viscosity — thin bases climb faster; thick bases stall out.

Rattan reeds

Rattan is the inner core of the rattan palm, cut and kiln-dried into 3 mm or 4 mm diameter sticks. Porous, fast-wicking, cheap. The default reed for about 85% of retail diffusers.

  • Pros: Strong throw, works with both DPG and eco base, budget-friendly.
  • Cons: Clogs faster with heavy vanillin fragrances. Needs flipping every 5–7 days.
  • Best for: Retail diffusers, gift-makers, anyone using DPG + light-to-mid fragrance oils.

Fibre reeds (polyester / cotton / sola)

Fibre reeds are extruded polymer with parallel channels running the length of the reed. Throws less aggressively but almost never clogs.

  • Pros: Consistent throw for 6–8 weeks, doesn't need flipping, looks more premium on retail shelves.
  • Cons: 30–40% weaker throw than rattan on the same fragrance.
  • Best for: Minimalist diffuser brands, white-label production, subtle-scent spaces.

Black reeds

Same rattan core, dyed black. Identical performance to natural rattan — purely cosmetic. Good upsell on moody candle brands.

2. DPG vs Eco Base — which one wins?

DPG (dipropylene glycol)

The industry default. Colourless, low viscosity, non-greasy. Mixes cleanly with almost every fragrance oil.

Property DPG
Viscosity Very low (1.6 cP at 25°C)
Fragrance solubility Up to 30% wt/wt
Flash point 124°C (not classified flammable for transport)
Typical cost Lowest per litre
Shelf life in diffuser 8–12 weeks

Eco base (Augeo / Clean+Green / similar)

Renewable-source solvent derived from non-GMO corn. Becoming standard for eco-positioned brands.

Property Eco base
Viscosity Slightly higher (2.0–2.4 cP at 25°C)
Fragrance solubility 20–25% wt/wt
Flash point >100°C, typically non-flammable classified
Typical cost 30–50% more than DPG
Shelf life in diffuser 8–10 weeks

Rule of thumb: If your buyer asks "what's in it?" — eco base is the better story. If they ask "how strong is the throw?" — DPG wins on equal fragrance load.

3. Fragrance load — why 15–25%?

Fragrance load is the percentage of fragrance oil by weight in the finished diffuser liquid.

  • Below 15% — throw dies within 2–3 weeks. Do not go below 15%.
  • 15–18% — economical, suitable for strong fragrances (e.g. oud, sandalwood).
  • 20% — the Wickii default. Works for 85% of fragrance oils.
  • 22–25% — for weak or heavily diluted oils. Go above 25% only if the TDS explicitly allows it.
  • Above 25% — not recommended. The diffuser turns milky and throw drops.

IFRA compliance: Reed diffusers fall under IFRA Category 10A (air-care, no skin contact). Check each fragrance's IFRA certificate before exceeding 25%.

Worked example — 100 mL diffuser at 20% load

  • Total liquid weight: 100 g
  • Fragrance oil: 20 g (20%)
  • Base (DPG or eco): 80 g
  • Optional dye: 1–2 drops max

4. How many reeds do I need?

The baseline is 8 reeds per 100 mL bottle.

Bottle size Starting reed count Max reed count Notes
50 mL 5 reeds 7 reeds Small spaces: bedside, bathroom
100 mL 8 reeds 10 reeds Retail default
150 mL 10 reeds 12 reeds Living rooms up to 20 m²
200 mL 12 reeds 14 reeds Larger open-plan spaces
250 mL+ 14 reeds 16 reeds Commercial / retail floor

More reeds = stronger throw, shorter life. Flip rattan reeds weekly; fibre reeds need no flipping.

5. Bottle selection

  • 18 mm neck: Standard for retail diffusers. Fits 3 mm and 4 mm reeds comfortably.
  • 14–16 mm neck: Minimalist, tighter grip, slower evaporation.
  • Glass — non-reactive with fragrance oils at any load. Always the safer choice for retail.
  • PET (plastic) — cheaper but some fragrances degrade PET over 4–6 weeks.

6. Diffuser-making checklist

  1. Weigh empty bottle on tared scale.
  2. Add DPG or eco base to bottle (80% of total fill weight).
  3. Add fragrance oil (20% of total fill weight by default).
  4. Swirl gently — do not shake.
  5. Cap and rest 24 hours before first reed insertion.
  6. Insert reeds. Flip each reed once after 15 minutes.
  7. Label with batch number, fragrance name, date made, and flip-by date.

7. Troubleshooting

"My diffuser has no throw after 3 days"

  • Check fragrance load — under 15% is the most common cause.
  • Check reed count — add 2 reeds.
  • Flip the reeds if rattan.

"The reeds turned brown"

Vanillin content. Vanillin oxidises on fibre reeds in 2–4 weeks. Switch to rattan, or accept dark-amber reeds as a vanilla signature.

"The diffuser has gone cloudy"

Fragrance-to-base ratio is too high (>25%). Re-mix at lower load, or switch to a fragrance rated for diffuser applications.

"Reeds are leaking onto the bottle"

Reeds are too long for the bottle height. Trim reeds to 2.5× bottle height.

FAQ

Are rattan reeds or fibre reeds better?

Rattan reeds give 20–40% stronger scent throw but need flipping every 5–7 days and last 2–3 weeks at peak. Fibre reeds are quieter but last 6–8 weeks without maintenance.

Can I make a reed diffuser without DPG?

Yes — switch to an eco base (Augeo, Clean+Green, or similar). Throw will be 10–20% lower on equal fragrance load, but it's solvent-free and non-flammable.

What fragrance load should I use for a reed diffuser?

20% by weight is the Wickii default and works for most candle fragrance oils. Go to 25% only when the fragrance's IFRA certificate supports it. Below 15% the throw dies within 2–3 weeks.

How long does a reed diffuser last?

At 20% fragrance load in a 100 mL bottle with 8 reeds, expect 8–12 weeks of scent throw.

Do I need to flip reed diffuser reeds?

Flip rattan reeds weekly, or when throw drops. Fibre reeds do not need flipping.

Can I reuse reeds from an old diffuser?

No. Used reeds carry oxidised fragrance that will contaminate the new scent. Always start with fresh reeds.

Why did my diffuser stop working after 2 weeks?

Most common cause: fragrance load below 15%. Second most common: reeds clogged by vanillin fragrances and need replacing.

Related guides

Ready to start?

Wickii stocks every component in this guide: DPG base, eco base, rattan and fibre reeds, diffuser glassware, collars, and 200+ Australia-made fragrance oils.