When and How to Harvest Tarragon for the Best Flavor

The flavor window

Tarragon does not hold a flat level of flavor through the season. The essential oil builds as the plant grows through late spring, peaks in early to midsummer on established stems that have hardened slightly, and thins from late summer onward as the plant slows and the lower leaves start to yellow.

That means the same plant tastes quite different in different months. Very early shoots are tender but mild. Midsummer growth on a plant kept lean and sunny is where the anise sweetness and the faint numbing tingle on the tongue are strongest. Late-season leaves are the ones people describe as grassy or like nothing at all.

Time of day matters more here than with most herbs. Cut in the morning after the dew has dried but before the sun is high. Oil content is highest then and drops through a hot afternoon.

How to cut

Cut stems, do not strip leaves. Running your fingers down a stem tears the leaf bases, leaves ragged wounds that brown, and gives you a handful of bruised leaves that lose scent within minutes. Take clean cuts with scissors or snips and strip the leaves in the kitchen instead.

Take the top third of a stem, cutting just above a leaf joint. The plant branches from the pair of buds below that cut, so a season of picking this way slowly makes the plant bushier rather than balder. Never take more than about a third of the whole plant at once during the first season, or more than half at once on an established clump.

1. First cut of the season Wait until the plant is at least eight inches (20 cm) tall and clearly growing away. Take the tips only. On a plant in its first year, take nothing at all until midsummer and then only a few sprigs.
2. The main summer cut In early summer, take the whole clump down by about a third in one go. This is the largest and best-tasting harvest of the year, and it doubles as the trim that stops the stems flopping. Expect regrowth within two to three weeks.
3. Repeat picking Between the big cuts, take individual stems as you need them, working around the plant rather than repeatedly cutting the same side. Always cut above a leaf pair, never leaving a bare stub.
4. Last cut Make the final harvest about six weeks before your first expected frost. After that, leave the plant alone to build its crown for winter. Anything still standing when frost blackens it is not worth eating.

Keeping what you cut

Tarragon is one of the herbs that does badly dried. The compound that carries most of its character is volatile and largely disappears in a warm airy dry, which is why dried tarragon from a jar tastes of hay. If you dry it anyway, do it fast in the dark and use it within a few months, accepting that it is a different and weaker ingredient.

Freezing and steeping both keep far more. Whole sprigs frozen flat in a bag hold their flavor for months and go straight into cooking from frozen. Vinegar is the traditional route for a reason: pack a jar loosely with clean dry sprigs, cover with warmed white wine vinegar, and leave it somewhere dark for a month.

Fresh cut stems keep about a week standing in a glass of water in the fridge with a loose bag over the top. Washing before storage shortens that considerably, so wash only what you are about to use.

Reading the plant, and what to log

Two signals tell you the good harvesting is over for the year. The lower leaves start to yellow and drop while the tips still look fine, and the leaves themselves get narrower and harder. Once both are showing, further cutting takes more out of the plant than it gives you in the kitchen.

Record the date of your main summer cut and roughly how much you got from it, along with a one-line note on how strong it tasted. Over three seasons this is the clearest evidence you have of a clump declining with age, and it tells you which spring to divide in without guessing.