Lemon myrtle
Also known as lemon-scented myrtle, lemon ironwood, Backhousia citriodora
Quick answer
An Australian rainforest tree whose leaves smell more intensely of lemon than lemons do. Its oil is almost pure citral, which makes it a concentrated lemon-grass-and-zest flavour for baking, tea, fish and dressings — and one that fades quickly with heat.
- Tastes of
- lemon, zesty, herbal, sherbet, faintly bitter
- Heat
- Scoville does not apply
- Goes with
- White fish, Prawns
- If you have none
- Lemongrass — see the limits
Other names
What this spice is called elsewhere, and where the translation is not clean.
lemon myrtle
English — Australia
A myrtle-family tree, not a citrus, and not the Mediterranean myrtle (Myrtus communis) either.
Flavour and aroma
Strong lemon with a slight bitterness and a green, herbal finish. Used in small amounts.
Intense, clean lemon — sherbet and zest — with a faintly eucalyptus or herbal edge. The leaf oil is typically ninety per cent or more citral, which is why it smells so purely of lemon.
Dried and ground, a bright olive green that browns with age.
A fine green powder or flake.
Heat
Pungency scale: none — this spice is not pungent
No heat.
- Citral — Geranial and neral together, typically ninety per cent or more of the leaf oil — the whole of the lemon character.(what citral is)
Pairings
Ranked by how well established the combination is, with the reason and the caveats attached.
Foods
White fish
StrongUsed in modern Australian cooking as a crust, rub or marinade for fish, in the role lemon or lemongrass would otherwise play. Its citral carries a strong lemon flavour without the acidity of juice, so it seasons fish without cooking it.
How: Crusted or grilled fish; Marinades
Prawns
GoodPrawns take lemon myrtle in marinades and butters as they take lemon or lemongrass. Added late, because citral fades with long heat.
How: Grilled prawns; Flavoured butters
Other spices and blends
Anise myrtle
StrongSold side by side and combined in native-spice blends and baking; the citral of lemon myrtle and the anethole of anise myrtle are a lemon-and-aniseed pairing familiar from European baking.
Wattleseed
GoodTwo native flavours often combined in desserts and baking: the roasted coffee-and-hazelnut note of wattleseed under the bright lemon of lemon myrtle.
How: Ice cream; Biscuits and cakes
If you have no lemon myrtle
What to use instead, and — more usefully — where each replacement stops working.
Lemongrass
AcceptableUse: 3–4× by volume — Three to four times as much lemongrass, because lemon myrtle carries more citral.
Both taste of lemon because of citral. Lemongrass adds a grassy base and is fibrous, so it is infused and removed rather than stirred in; the lemon is softer.
| Flavour | Aroma | Colour | Heat |
|---|---|---|---|
| close | close | different | n/a |
Works for
- Infusions, syrups and custards
- Marinades for fish and chicken
Does not work for
- Shortbread and baking where the ground leaf is mixed into the dough
- Dry rubs and crusts
Makrut lime leaf
SituationalAnother citrus-scented leaf, infused and removed, giving a lime rather than lemon character from a different chemistry. Useful in savoury infusions, less so in sweet baking.
| Flavour | Aroma | Colour | Heat |
|---|---|---|---|
| partial | partial | different | n/a |
Works for
- Infused broths, curries and poaching liquids
Does not work for
- Shortbread, ice cream and desserts built on a lemon flavour
Preparation and use
Use about a quarter as much as you would lemongrass and add it late, or infuse it off the heat. In baking it can go in with the flour.
Shortbread, cakes, cheesecake and ice cream; tea; dressings; marinades and crusts for fish, prawns and chicken. It pairs with white fish, prawns, chicken, cream, honey, ginger and other Australian native flavours such as wattleseed and pepperberry.
- baking — Survives baking in shortbread and cakes better than lemon zest, though much of the top note is lost; use it generously in baked goods.
- infusing — Steeped in hot water or cream it gives a strong lemon flavour quickly; a long boil flattens it, because citral is volatile.
Storage and freshness
| Form | Good for | Conditions | Fridge |
|---|---|---|---|
| Ground | 6–12 months | Cool, dark, dry and sealed. | No |
Open the jar: it should smell of lemon at once.
- Brown rather than green powder
- A dusty, faint lemon smell
- Evaporation of citral
- Oxidation of citral to flatter, less lemony compounds
Quality is not the same as safety
Faded lemon myrtle is a quality matter. Kept dry it does not become unsafe.
Forms
These forms differ enough to need separate answers: treating them as interchangeable produces a dish that is wrong.
Ground lemon myrtle
Dried, milled leaf: the usual form.
Whole dried leaf
For infusing in tea, stock or syrup and removing.
Commonly confused with lemon myrtle
Direct comparisons, each with the difference that actually changes what you cook.
Botany
Myrtaceae
The myrtle family, with cloves, allspice and eucalyptus.
A small to medium evergreen tree of subtropical rainforest with glossy, lance-shaped leaves dotted with oil glands and clusters of creamy white flowers.
Commonly confused with
The flavour comparison that matters: both owe their lemon scent to citral. Lemon myrtle carries a higher proportion of it and none of lemongrass’s grassy base, so it tastes of lemon more purely and more strongly. A little goes much further.
Another citrus-scented leaf, and a different chemistry — citronellal leads in makrut lime leaf, citral in lemon myrtle. Not interchangeable in a Thai curry.
Lemon verbena
A South American shrub with a similar citral-based scent and a softer, more floral character. The two can stand in for each other in tea and desserts.
How it is grown
The plant, how it is propagated and farmed, what threatens the crop, and where it is produced now. Crop diseases here are plant health, not food safety.
The leaves, harvested from trees kept pruned low as hedges.
How it is propagated
- Stem cuttings.
Propagated from cuttings of high-citral selections.
How it is farmed
- Plantation · Queensland and northern New South Wales, Australia
Grown in plantations as a hedged tree crop, cut for leaf, which is what turned a rainforest tree into a commercial spice.
Most spices are grown in more than one way; none of these is the only one.
Harvest
Harvested by hand or by machine, depending on the farm.
Where it comes from and how it is made
The subtropical rainforests of central and south-eastern Queensland.
- Australia (Queensland and northern New South Wales) — origin. Where the plantation industry is concentrated.
Leaves are cut from hedged plantation trees, several times a year.
- Drying — Leaves dried at low temperature and milled to a flake or powder.Why: Low temperature preserves the volatile citral.
- Distillation — Leaves steam-distilled for the essential oil used in flavourings and cosmetics.
Grown in plantations, pruned as low hedges for mechanical leaf harvest. Commercial cultivation expanded from the 1990s as part of the Australian native food industry.
Subtropical, warm and moist.
How these steps work: essential-oil distillation.
Buying and quality
Buy small quantities of ground leaf for baking and cooking, and whole leaf for tea. Neither keeps its lemon for long once opened.
- Bright green powder or flake.
- A strong lemon smell on opening.
- A recent packing date.
History and trade
The leaf oil was distilled commercially in the early twentieth century and then largely neglected, before a plantation industry grew from the 1990s with the wider interest in Australian native foods. Dried leaf and oil are now sold in Australia and exported for teas, flavourings and cosmetics.
Culture
Recorded by tradition rather than merged into one narrative — these are genuinely different practices.
The Australian native food industry
Since the 1990s lemon myrtle has become a signature flavour of modern Australian cooking — in shortbread, cheesecake, ice cream, tea, dressings and marinades for fish and chicken — and one of the native foods most often met by visitors. How Aboriginal peoples of its home rainforests used the leaf is not documented here to a standard SpiceHQ can cite, and is not presented as though it were.
- Shortbread and desserts
- Infused as tea
- Fish and chicken marinades
What we do not know
Published openly. A gap we have named is more useful than a gap we have filled with plausible prose.
Not yet established for lemon myrtle:
- Archaeological evidence
- Historical timeline
- Ceremonial use
- Traditional medicinal context
- Regulatory limits
- Traditional uses