Tarragon vs. Rosemary: A Tender Anise Herb and a Resinous Hardy One

Tarragon and rosemary sit at opposite ends of the herb shelf. One is a tender, anise-scented leaf that fades fast once dried and belongs at the very end of cooking. The other is a needle-leaved shrub with a pungent, piney, slightly bitter edge that stands up to drying and long cooking.¹ You can trade one for the other only loosely, and it works much better in one direction than the other.

Side by side

The oil-content figures are both PROSEA’s, for dried leaf, so you can compare them. The compound figures you can’t: they come from different studies and show what leads each oil, not a measured comparison.

The flavor gap

Tarragon tastes of anise. The University of Illinois Extension describes its taste as licorice or anise,⁶ and says the same of fennel.¹¹ Tarragon’s oil is mostly estragole.⁴

None of the sources we reviewed find any anise in rosemary. It tastes pungent and slightly bitter. PROSEA ties its camphor-like smell and burning taste to borneol and its warm, piny note to α-pinene,² and across oils from six countries α-pinene and 1,8-cineole were the leading compounds.⁵ You’ll also see rosemary called minty or tea-like, but those are descriptions, not measurements.

Drying and heat

This is where the two behave most differently in your kitchen.

• Tarragon is best fresh. Its flavor fades quickly when the leaves are dried, so use it fresh whenever you can.⁶ America’s Test Kitchen counts tarragon among the delicate herbs whose flavor compounds are more volatile.
• Rosemary dries well. In ATK’s tests, dried rosemary, sage and thyme held up reasonably well in recipes with long cooking times and a good amount of liquid.¹ ATK also groups rosemary with the hearty herbs you add early, whose flavor compounds are somewhat more heat-stable.¹²

These sources don’t settle whether drying “concentrates” rosemary’s flavor, or whether fresh and dried taste alike; see dried rosemary vs. fresh and dried tarragon vs. fresh.

Can one stand in for the other?

Only loosely, and the dish will taste different.

Tarragon for rosemary. A Couple Cooks says tarragon can work in a pinch, at half the amount.¹³ The Spice House suggests tarragon in place of rosemary for fish or dishes that could use an anise touch.¹⁴ Expect an anise dish, not a rosemary one, and add the tarragon late.

Rosemary for tarragon. We found no source that recommends it. Rosemary is the stronger herb by the University of Delaware’s grouping, has no anise note, and would steamroll a béarnaise or a fines herbes omelet. If you must, use a small pinch of finely chopped rosemary and taste. You’re better off with one of the anise-leaning options on tarragon substitutes. Going the other way? See rosemary substitutes.

Where each belongs

Tarragon. It’s an essential ingredient in béarnaise, and one of the usual herbs in fines herbes. The leaves are especially good with chicken, eggs and lobster, and tarragon vinegar is made by adding the herb to wine vinegar. It also goes into oils, marinades and salads.

Rosemary. Use it with meats, vegetables and soups, in drinks and baking, and in infused oils and herbal teas. Lamb, roast potatoes, focaccia and white beans are classic pairings.

Both turn up with chicken and vegetables, but they do different jobs there. Tarragon is a fresh finishing note; rosemary is a background note that cooks in.

What isn’t known

• You may run across the claim that rosemary leaves are sharp enough to be a choking hazard. We found no source for it.
• Rosemary vinegar sometimes gets called less useful than tarragon vinegar. No source compares them.

Related

• Tarragon, tarragon substitutes, tarragon uses and how to store tarragon
• Rosemary, rosemary substitutes, rosemary uses and cooking with rosemary
• Tarragon vs. dill, tarragon vs. thyme, rosemary vs. thyme and rosemary vs. sage
• Fines herbes