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Genovese Basil vs. Sweet Basil: A Cultivar and the Category It Belongs To

By · Reviewed · 12 sources

Genovese Basil Vs. Sweet Basil

Genovese basil isn’t an alternative to sweet basil. It’s one kind of it. “Sweet basil” is the everyday name for the species Ocimum basilicum, and Genovese is a large-leaved Italian cultivar within that species, the one the Herb Society of America calls “an ideal pesto basil.”1 So a pot or packet labeled just “sweet basil” could be Genovese or one of many other types, and they can drift: in one US field trial, the lot sold as ‘Sweet’ had methylchavicol among its major aroma compounds and the ‘Genovese’ lot didn’t.2 For most cooking you can swap them one for one. For pesto, taste a leaf first.

Side by side

Genovese basil“Sweet basil”
What the name coversOne cultivar group, sold under names like ‘Genovese’ and ‘Genovese Gigante’The whole species Ocimum basilicum, including Genovese
SpeciesOcimum basilicumOcimum basilicum
FamilyLamiaceae (mint family)Lamiaceae (mint family)
Native range of the speciesTropical and subtropical Asia to northern Australia (Kew); other references differ (see below)3Same species
Leaves“Very large leaves” on a plant about 30 inches tall (Herb Society)1Glossy, oval, smooth or slightly toothed, typically cupped a little; Britannica lists small-leaf, larger-leaf Italian and lettuce-leaf types in commerce
Main oil compounds, same 1999 US trialLinalool 77%, 1,8-cineole 12%2The lot sold as ‘Sweet’: linalool 69%, methylchavicol 13%, 1,8-cineole 11%2
FlavorSweet and green, with clove and a peppery edgeAnywhere from close to Genovese to noticeably more anise-like, depending on the plant
Protected formBasilico Genovese PDO, from the Tyrrhenian side of Liguria only4None
Forms soldMostly fresh bunches, plants and seedFresh, dried and ground dried
Typical usesPesto above allItalian pizza, pasta, chicken and cheese dishes and pesto; French omelets and soups; Thai cooking
PriceNo dated, sourced retail comparison foundNo dated, sourced retail comparison found

The chemistry row compares like with like: both figures come from the same field trial of seed bought from North American suppliers, grown and distilled the same way, one seed lot per cultivar.2 For each herb in depth, see the Genovese basil and basil profiles.

What “sweet basil” means

The U.S. Food and Drug Administration’s list of spices generally recognized as safe gives “sweet” basil as Ocimum basilicum,5 and the Herb Society of America calls sweet basil “the common culinary basil.” It describes Genovese as having the familiar aroma and taste “of the numerous basils called ‘sweet basil.’”1 Think of “sweet basil” as a family name, and Genovese as one member.

It’s an unusually varied family. PROSEA, the Southeast Asian plant handbook, recognizes at least six chemical types within O. basilicum.6 Thai basil is O. basilicum too; see basil vs. Thai basil. The Purdue trial found that ‘Genovese’, ‘Italian Large Leaf’, ‘Mammoth’, ‘Napoletano’ and ‘Sweet’ were among the cultivars dominating the American fresh and dry culinary herb markets at the time.2

Where the species is native isn’t settled. Kew gives tropical and subtropical Asia to northern Australia;3 Britannica says basil is likely native to India;7 PROSEA says it probably originated in western Asia.6 PROSEA traces its spread from the Middle East through Europe, reaching England in the 16th century and North America in the early 17th.

The same trial, three sweet basils

The clearest look at how sweet basils differ comes from a single comparison. Purdue University researchers grew commercially available basils side by side and distilled their oils:2

Cultivar (one seed lot each)HeightOil yieldMajor aroma compounds
‘Genovese’49 cm0.90%Linalool 77%, 1,8-cineole 12%
‘Sweet’49 cm0.84%Linalool 69%, 1,8-cineole 11%, methylchavicol 13%
‘Italian Large Leaf’46 cm0.83%Linalool 65%, methylchavicol 18%

All three oils are led by linalool. The differences are in the supporting cast. Methylchavicol, also called estragole, makes up 60 to 75% of tarragon oil.8 It showed up among the major compounds of the ‘Sweet’ and ‘Italian Large Leaf’ lots but not the ‘Genovese’ lot.2 That’s one lot of each, from one season, not a survey of what’s sold, and nobody tested whether tasters could tell the three apart.

A second study points the other way for Genovese. Italian researchers analyzing young ‘Genovese Gigante’ plants found methyleugenol and eugenol as the main components, with methyleugenol dominant in plants up to 10 cm tall and eugenol in taller ones.9 Eugenol is also the main component of clove bud oil, at 70 to 90% according to PROSEA.10 The two studies measured different plants at different ages, so you can’t merge them.

A note on dried basil: the dried large-leaf varieties smell faintly of anise, while dried common basil is less fragrant and more pungent.

Basilico Genovese PDO

Only one version of Genovese basil has a legal definition. The EU’s protected designation, Basilico Genovese PDO, must be grown on the Tyrrhenian side of Liguria, must have an intense, characteristic aroma with a total absence of mint, and is sold as bunches of 3 to 10 whole young plants with their roots.4 “Genovese” on a seed packet or supermarket clamshell outside Italy names a cultivar type, not this product. Our Genovese basil profile covers the rules in full.

Differences that change the dish

Pesto. This is where Genovese gets its reputation. The Herb Society calls it “an ideal pesto basil.”1 Going by the chemistry, a sweet basil with more methylchavicol should make a pesto with more anise in it, though we didn’t find anyone who’s run a tasting to confirm it.

Raw uses. On a Margherita pizza, in a Caprese salad or torn over tomatoes, any good sweet basil works, and the big, tender Genovese leaf is easy to tear or slice.

Cooking. LSU AgCenter groups basil with the delicate herbs best added a minute or two before cooking ends, because long heat costs flavor and aroma.11 The Herb Society likewise says to add basil in the last few minutes of cooking.1 That goes for Genovese and any other sweet basil.

Dried. The Herb Society says most experts see no comparison between fresh and dried basil in flavor.1 Dried basil is usually sold simply as “basil” or “sweet basil,” with no cultivar named, so there’s little point hunting down dried Genovese. See dried basil vs. fresh.

Can one stand in for the other?

Yes, one for one. You don’t need a special ratio for strength: in the Purdue trial, the ‘Genovese’ and ‘Sweet’ lots had nearly the same oil yield (0.90% and 0.84%).2 Use the same amount. Where basil is the main flavor, as in pesto, taste a leaf first. If it smells strongly of anise, your pesto will come out different from a classic Genoese one.

What isn’t known

  • No retail survey shows which cultivars get sold under the plain label “sweet basil.”
  • The only like-for-like chemistry is one 1999 field trial with one seed lot per cultivar.2 Basil oil varies with plant age and growing conditions.9
  • We found no source comparing the leaf color or gloss of Genovese with other sweet basils.
  • We couldn’t trace claims that Genovese basil was first grown in Genoa. The PDO specification says only that the Romans brought basil to Liguria.4

Safety

The same compounds raise the same question for any sweet basil. Germany’s BfR says methyleugenol and estragole showed mutagenic and carcinogenic properties in animal studies, names basil-containing pesto among foods that may contain high amounts, and makes no consumption recommendation for consumers.12 The EU Scientific Committee on Food put estragole at 20 to 43% of sweet basil oil in its 2001 assessment.8 Neither body tells people to stop eating basil. The basil profile has the full evidence.

Footnotes

  1. Michele Meyers, Basil: An Herb Society of America Guide, The Herb Society of America, 2003. herbsociety.org · Reference work ↩ ↩2 ↩3 ↩4 ↩5 ↩6

  2. “Comparative evaluation of North American commercially available Ocimum basil cultivars”, Table 1, Perspectives on New Crops and New Uses (1999), Purdue NewCROP. hort.purdue.edu · Peer-reviewed ↩ ↩2 ↩3 ↩4 ↩5 ↩6 ↩7 ↩8 ↩9

  3. Ocimum basilicum L., Plants of the World Online, Royal Botanic Gardens, Kew. powo.science.kew.org · Reference work ↩ ↩2

  4. “Basilico Genovese” DOP, disciplinare di produzione, eAmbrosia, European Commission. webgate.ec.europa.eu · Regulator ↩ ↩2 ↩3

  5. 21 CFR 182.10, Spices and other natural seasonings and flavorings, U.S. Food and Drug Administration. ecfr.gov · Regulator ↩

  6. N.O. Aguilar, Pham Truong Thi Tho and L.P.A. Oyen, Ocimum basilicum, Plant Resources of South-East Asia (PROSEA). uses.plantnet-project.org · Reference work ↩ ↩2

  7. “Basil”, Encyclopaedia Britannica, 2026. britannica.com · Reference work ↩

  8. Opinion of the Scientific Committee on Food on Estragole, European Commission, 2001. food.ec.europa.eu · Regulator ↩ ↩2

  9. Miele, Dondero, Ciarallo and Mazzei, “Methyleugenol in Ocimum basilicum L. cv. Genovese Gigante”, Journal of Agricultural and Food Chemistry, 2001 (abstract). agris.fao.org · Peer-reviewed ↩ ↩2

  10. E.W.M. Verheij and C.H.A. Snijders, Syzygium aromaticum, Plant Resources of South-East Asia (PROSEA). uses.plantnet-project.org · Reference work ↩

  11. “Flavorful Herbs”, LSU AgCenter. lsuagcenter.com · Reference work ↩

  12. “Alkenylbenzenes in food: how large is the health risk?”, BfR Communication No. 22/2022. bfr.bund.de · Regulator ↩