Rosemary (Salvia rosmarinus): Flavor, Compounds, History and How to Use It

Rosemary now shares a genus with garden sage: botanists file it as Salvia rosmarinus. In the kitchen it’s the piney, resinous herb behind roast lamb, roast potatoes and focaccia, the leaf of an evergreen Mediterranean shrub in the mint family, used fresh or dried to season meats, vegetables, soups and breads. Go easy with it, though. Its camphor edge turns harsh if you use too much.

At a glance

Measured values

7 figures, sourced

Measure	Value	Scope	Source
Essential oil	1–2 % of dried leaf	Dried leaf, PROSEA	uses.plantnet-project.org
α-Pinene	13.5–37.7 % of essential oil	Rosemary oils from plants collected in Australia, the USA, South Africa, Kenya, Nepal and Yemen (Satyal et al. 2017; at least five chemotypes)	mdpi.com
1,8-Cineole	16.1–29.3 % of essential oil	Rosemary oils from plants collected in Australia, the USA, South Africa, Kenya, Nepal and Yemen (Satyal et al. 2017; at least five chemotypes)	mdpi.com
Camphor	0.7–7.0 % of essential oil	Rosemary oils from plants collected in Australia, the USA, South Africa, Kenya, Nepal and Yemen (Satyal et al. 2017; at least five chemotypes)	mdpi.com
1,8-Cineole	24.0 % of essential oil	One Spanish oil of the camphor type, as reported by PROSEA	uses.plantnet-project.org
Camphor	35.3 % of essential oil	One Spanish oil of the camphor type, as reported by PROSEA	uses.plantnet-project.org
Pyrrolizidine alkaloids, maximum Limit	400 µg/kg	EU Regulation 2023/915, dried herbs (covers dried rosemary, not among the named exceptions)	eur-lex.europa.eu

Each figure is quoted as its source states it, with the samples or standard it applies to. Where sources differ, both are shown; nothing is averaged. All measured values

What rosemary is

Rosemary is a bushy evergreen shrub that usually grows 0.6 to 2 meters tall (about 2 to 6.5 feet). Its leaves are narrow, leathery and glossy dark green, with edges that curl under. The leaf blade is 1–5 cm long and only 1–2 mm wide, which is why cooks call them needles. The small flowers are pale blue or blue, seldom white, and grow in short clusters where the leaves meet the stem. Bees love them.

From Rosmarinus to Salvia

Kew’s Plants of the World Online accepts Salvia rosmarinus Spenn., first published in 1835, as the plant’s name, and lists the familiar Rosmarinus officinalis L. as a synonym.⁴ Britannica dates the change in practice to a 2017 taxonomic revision that moved rosemary out of Rosmarinus and into Salvia.⁵ Extension services have followed along: the University of Delaware’s rosemary fact sheet uses Salvia rosmarinus.⁶ Older names hang on in regulation, though. The FDA’s list of spices generally recognized as safe still has it as Rosmarinus officinalis L.⁷ Both names mean the same plant. For cooks, the upshot is a fun bit of trivia: rosemary now shares a genus with garden sage, Salvia officinalis. For how the two compare in the kitchen, see rosemary vs. sage.

Cultivars

Named cultivars differ mainly in habit, hardiness and flower color. The sources we found describe them as garden plants, not as different flavors:

• ‘Tuscan Blue’: dark blue-violet flowers (PROSEA); a tall, dark-blue-flowered variety (University of Delaware).
• ‘Arp’: a tall, upright variety that Delaware’s extension calls cold tolerant.
• ‘Albus’: white flowers.
• ‘Collingwood Ingram’: 0.6–0.9 m tall, usable as a tall ground cover.

You’ll see trailing and “barbecue” rosemaries sold widely, but we found no reliable source describing how they taste, so we won’t guess.

Flavor and aroma

The leaves have a pungent, slightly bitter taste. In the pan, rosemary tastes piney and resinous with a camphor edge, and that edge turns harsh if you use too much. The chemistry below fits that.

The compounds

The aroma lives in the leaf’s essential oil, which makes up 1–2% of the dried leaf according to PROSEA. PROSEA links rosemary’s pungent, camphor-like smell and burning taste to borneol, and its warm, piny note to α-pinene.¹ Britannica also names borneol as a key part of the oil.⁵

How much of each compound an oil contains depends on the plant’s chemotype, and rosemary has several:

The 2017 study found at least five distinct chemotypes among the oils it analyzed.² These figures describe distilled oils from particular plants, not a teaspoon of dried rosemary, so don’t merge them into one number.

Fresh vs. dried

Dried herbs are stronger than fresh by volume. The University of Delaware’s extension guide equates 3/4 to 1 teaspoon of crumbled dried herb with 2 to 3 teaspoons of fresh.⁸ That’s a general herb rule, not one measured on rosemary. For a closer look, see dried rosemary vs. fresh.

Origin and history

Rosemary is native to the Mediterranean, from Portugal, Spain and Morocco through France, Italy, Greece and the Balkans to Türkiye, Cyprus, Libya and Egypt. It’s been introduced elsewhere too, including Great Britain, the Canary Islands, central Mexico and Texas, and it’s introduced and cultivated across Europe, Asia and the Americas.

• Name. The Latin ros marinus means “dew of the sea.” The English form later got bent toward the unrelated words “rose” and “Mary”.
• Antiquity. Britannica reports that Egyptians used rosemary in burial rituals, that traces have turned up in tombs dated to 3000 BCE, and that ancient Greece and Rome linked the herb with memory and purification.⁵
• Britain. The Romans brought rosemary to Britain.
• Middle Ages. Rosemary was often burned in homes and hospitals for purification and was widely used in Europe to ward off illness.
• Shakespeare. In Hamlet, Ophelia hands out flowers with the line “There’s rosemary, that’s for remembrance.”⁹ It’s a symbolic line, not a claim that rosemary improves memory.

Rosemary’s role at weddings and funerals comes up a lot, but we couldn’t trace it to a source we could open, so we’ve left it out.

How rosemary is used

Rosemary seasons meats, vegetables, soups and beverages, and goes into baking, infused oils and herbal teas, as well as sauces, stews, herbal butters, jams, biscuits and bread. In real life that means roast lamb, chicken and pork, roast potatoes, focaccia and other breads, bean and tomato soups, and infused olive oil, vinegar and simple syrup.

Technique

America’s Test Kitchen groups rosemary with the “hearty” herbs that go in early, noting that their flavor compounds are somewhat more heat-stable than those of tender herbs.¹⁰ The University of Delaware’s guide gives the opposite general rule for long simmering: add herbs during the last 45 minutes.⁸ Both are general herb advice, not tests on rosemary, so think of them as two reasonable starting points. Whole sprigs early in a braise give you a background note. Chopped leaves near the end give a sharper one.

Delaware’s guide also puts rosemary among the strong herbs and warns that the flavor can be “extremely objectionable” if you use too much.⁸ If a dish has gone over, see too much rosemary. More ideas at rosemary uses and cooking with rosemary.

Pairings

Rosemary shows up in commercial blends with thyme and sage. McCormick’s culinary poultry seasoning, for example, lists thyme, sage, marjoram, rosemary, black pepper and nutmeg. Its classic partners are garlic, thyme, sage, black pepper, lemon and olive oil. Rosemary is also one of the five herbs in the French Label Rouge specification for herbes de Provence, with thyme, savory, oregano and basil.¹¹ See rosemary vs. thyme and rosemary vs. lavender for side-by-side comparisons.

Buying and quality

We didn’t find an international grading standard for dried rosemary leaf. Look for fresh sprigs that bend, with no blackened or slimy leaves. Dried rosemary should smell strong when you crush a leaf between your fingers.

Rosemary matters to food makers for more than flavor. PROSEA reports that rosemary oleoresin is used as a natural antioxidant, and that carnosic acid, the main phenolic diterpene in the leaves, outperformed the synthetic antioxidants BHA and BHT in soybean oil.¹ In the EU, extracts of rosemary are an authorized food additive, numbered E 392.³

Storage

We found no published shelf-life figure for fresh or dried rosemary from a regulator or standards body. The flavor is carried in volatile oil, so trust your nose: if a crushed leaf barely smells, the rosemary has faded. For methods, see how to store rosemary, can you freeze rosemary? and how to dry rosemary.

Safety

• Food use. The FDA lists rosemary among spices and natural seasonings generally recognized as safe for their intended use.⁷
• Thujone. The European Medicines Agency names rosemary, alongside sage, thyme and wormwood, among plants that contain thujone in highly variable amounts, and estimates that average diets already supply 0.3 to 1 mg of thujone a day.¹² The EMA statement is about herbal medicines, not seasoning, and gives no figure for rosemary leaf itself.
• Rosemary extract (E 392). JECFA set a temporary acceptable daily intake of 0–0.3 mg per kg of body weight, expressed as carnosic acid plus carnosol. EFSA’s 2018 exposure assessment concluded that its own estimates “very likely overestimate” real exposure. The highest 95th-percentile estimate was 0.20 mg/kg body weight per day, in children.³
• Contaminants. EU law caps pyrrolizidine alkaloids in dried herbs at 400 µg/kg. That limit covers dried rosemary, since it isn’t one of the named exceptions.¹³

We make no claim that rosemary treats or prevents any condition.

Substitutes and comparisons

Dried rosemary is the closest stand-in for fresh; just use less (see the conversion above). Thyme and sage can cover some of its savory, resinous role, but neither tastes the same. See rosemary substitutes for the ranked list, and tarragon vs. rosemary for another comparison.

Footnotes

1. C.C. de Guzman, Rosmarinus officinalis, Plant Resources of South-East Asia (PROSEA). uses.plantnet-project.org · Reference work ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶

2. Satyal et al., “Chemotypic Characterization and Biological Activity of Rosmarinus officinalis”, Foods, 2017. mdpi.com · Peer-reviewed ↩ ↩² ↩³

3. EFSA ANS Panel, “Refined exposure assessment of extracts of rosemary (E 392) from its use as food additive”, EFSA Journal, 2018. pmc.ncbi.nlm.nih.gov · Regulator ↩ ↩² ↩³

4. Salvia rosmarinus Spenn., Plants of the World Online, Royal Botanic Gardens, Kew. powo.science.kew.org · Reference work ↩

5. “Rosemary”, Encyclopaedia Britannica. britannica.com · Reference work ↩ ↩² ↩³

6. Judd and Hermenaus, “Rosemary”, University of Delaware Cooperative Extension, 2024. udel.edu · Reference work ↩

7. 21 CFR 182.10, US Food and Drug Administration. ecfr.gov · Regulator ↩ ↩²

8. “Using Herbs and Spices”, University of Delaware Cooperative Extension, 2025. udel.edu · Reference work ↩ ↩² ↩³

9. Shakespeare, Hamlet 4.5, Folger Shakespeare Library. folger.edu · Reference work ↩

10. Liz Bomze, “Our Guide to Fresh Herbs”, America’s Test Kitchen, 2019. americastestkitchen.com · Publication ↩

11. Label Rouge “Herbes de Provence” (LA 02/03), specification modification request, INAO, 2014. extranet.inao.gouv.fr · Regulator ↩

12. Public statement on herbal medicinal products containing thujone, European Medicines Agency, 2012. ema.europa.eu · Regulator ↩

13. Commission Regulation (EU) 2023/915, Annex I, section 2.4. eur-lex.europa.eu · Regulator ↩

Also drawn on

• Salvia officinalis L., Plants of the World Online, Royal Botanic Gardens, Kew. powo.science.kew.org
• rosemary (n.), Online Etymology Dictionary (Douglas Harper). etymonline.com
• Poultry Seasoning, 12 oz (McCormick Culinary), McCormick & Company. mccormick.com