Lemon myrtle leaves

Name and Queensland range

Kew accepts Backhousia citriodora F.Muell. and records Queensland as its native range. ANBG and ANPSA describe coastal Queensland occurrence and use names including lemon-scented myrtle and lemon ironwood. ANPSA notes that “lemon ironwood” is an older forestry name and distinguishes lemon ironbark, Eucalyptus staigeriana; common names do not establish a specimen identity. Kew’s biome label is not a cultivation tolerance.

Food and flavouring

The South Australian landscape-board sheet lists fresh or dried leaves for teas, syrups, glazes, cakes, biscuits, sauces and dressings. A separate information sheet by Andrew Pengelly says no parts are edible fresh and describes dried, ground leaves as a cooking spice, but provides no evidence on that page for its categorical fresh-leaf statement. These reports differ on preparation; neither establishes raw whole-leaf safety or a toxicity rule. Essential-oil and extract findings concern different materials and do not settle culinary-leaf safety. The sheet gives no complete measured recipe or validated food process.

Outdoor growing

The Australian National Botanic Gardens describes Queensland coastal-forest occurrence and recommends rich, moist, mulched, well-composted soil. Its cultivation account notes young plants are slightly frost-tender and describes sheltered semi-shade in frosty areas. The South Australian sheet lists full sun; these are separate garden contexts, not one universal light prescription.

Reading frost observations

ANBG reports thriving specimens under protective canopy and shrubbery, in a garden section where winter temperatures down to −8°C were recorded. This is a site observation. It does not establish the individual plants’ exposure, an experimental survival threshold or a safe temperature for young plants.

Propagation and containers

ANBG describes tip cuttings taken in March in its Australian setting and notes that low branches can root where they touch soil. It also describes indoor container use. Pot volume, indoor light requirements and a heated or unheated greenhouse production regime are not specified.

Research gaps

Numeric heat/humidity limits, productive watering schedules and cultivar-specific frost responses remain unestablished.

Food quantities, measured drying endpoints and household storage life remain unresolved.

No qualified specimen or cultivar determination is recorded.

Research status

The underlying plant account received a partial source review. Its review scope is described in the original plant article.