Start with the right tarragon, or the whole project is a waste of time
The first thing I check before taking a cutting is the plant label. True French tarragon, the one with the sweet anise scent used in béarnaise sauce and chicken dishes, is normally propagated from cuttings or division. It rarely produces useful seed. Russian tarragon can be grown from seed, but it is tougher, coarser, and much less fragrant.
If you bought a small “tarragon” plant from a mixed herb display, crush one leaf between your fingers before cutting it. French tarragon smells distinctly like liquorice, fennel, or anise. Russian tarragon smells green and herbal but weak. A cutting will faithfully reproduce whatever plant you have, so do not expect bland Russian tarragon to turn into French tarragon just because it roots successfully.
Take cuttings when the stems are growing, not when the plant is struggling
The best window is late spring through early summer, once the plant has made fresh, flexible shoots. In a mild climate, that is often May or June. You can root cuttings later in summer, but they tend to dry out faster and have less time to establish before cold weather.
Choose stems that are about 10 to 15 cm long. They should be green, firm, and not carrying flower buds. Avoid the oldest woody stems near the base and avoid the very soft, floppy tips that bend over at a touch. The ideal cutting has a little firmness at the bottom and fresh leaves at the top.
A realistic batch that worked
One June, I took eight cuttings from a French tarragon plant at about 8:00 in the morning, before the patio got hot. Each cutting was roughly 12 cm long. I put four into a small pot of damp perlite and seed compost, and four directly into a glass of water. After 18 days, three of the soil cuttings had small white roots visible through the drainage holes. The water cuttings all rooted too, but two wilted badly after being moved into compost. The soil-rooted plants settled much faster.
That is why I use water only as a quick experiment or when I have no potting mix available. Rooting in a light medium produces roots already adapted to air pockets and soil moisture, which makes transplanting less dramatic.
Make the cut cleanly and keep the lower stem bare
Use sharp scissors, pruners, or a clean knife. Cut just below a leaf joint, also called a node. Roots commonly form around these points. Remove the leaves from the lower half of the stem, leaving two or three small sets of leaves at the top.
Do not strip the top completely. The cutting needs leaves to make energy. But do not bury leaves either. A leaf pressed into wet compost is an invitation for rot.
Rooting hormone is optional. French tarragon usually roots without it, but a light dusting can improve consistency if you are taking only one or two cuttings and really want them to succeed. Tap off the excess; a thick coating does not help.
The goal is not to keep a cutting wet. The goal is to keep it from drying out while giving the stem enough oxygen to form roots.
Use a potting mix that drains faster than ordinary garden soil
Tarragon dislikes sitting in cold, wet soil. For cuttings, I use roughly equal parts seed compost and perlite, grit, or coarse horticultural sand. The mix should hold moisture when squeezed but not release a stream of water.
Fill a small pot with drainage holes, water it once, and let the excess drain away. Make planting holes with a pencil or dibber before inserting the cuttings. Pushing a stem directly into the mix can scrape off the outer tissue at the base, especially if rooting powder is on it.
Plant each cutting 3 to 4 cm deep and firm the mix gently. A 9 cm pot can hold three cuttings if the leaves are not crowded. For the easiest aftercare, though, one cutting per small pot is hard to beat.
Where to put the pot
Place it in bright indirect light. An east-facing windowsill with a sheer curtain, a sheltered greenhouse bench, or a shaded outdoor spot that gets morning light all work well. Direct afternoon sun is the usual killer. The cutting has no roots yet, so its leaves lose water faster than the stem can replace it.
A clear plastic bag loosely supported over the pot can help in a dry house, but it must not touch the leaves. Leave an opening at the bottom or remove it for a few minutes daily. Stale, humid air encourages grey mould. I would rather mist lightly on a hot day than seal a cutting into a dripping plastic tent.
What healthy rooting looks like, and what should worry you
For the first week, a cutting may look almost unchanged. That is normal. It may even droop slightly in the warmest part of the day, then recover by evening. Do not pull it up to check for roots; that breaks the tiny new ones just as they start.
After two to four weeks, look for new growth at the tip or a gentle resistance when you lightly tug the stem. That resistance is usually the first useful sign of rooting.
- Healthy: leaves remain green, the stem stays firm, and new tip growth appears.
- Too dry: leaves feel thin, curl inward, and stay limp overnight.
- Too wet: lower stem turns dark brown or black, leaves yellow from the bottom, and the pot feels heavy for days.
- Too much sun: leaves bleach pale or develop dry, crispy patches while the compost is still damp.
- Not a problem: one lower leaf yellowing after planting, especially if the cutting still has a firm stem and fresh top growth.
A common mistake is watering every day on a schedule. A small pot in cool weather may need water only every four or five days. Check with a fingertip: the surface can become slightly dry, but the mix just below it should feel faintly moist. If it is saturated, leave it alone.
Move rooted cuttings carefully instead of rushing them into the herb bed
Once roots are visible at the bottom of the pot or the cutting has produced several centimetres of new growth, transplant it into a slightly larger container. Use a free-draining potting mix with added grit. Keep it in partial sun for about a week after moving it, then gradually introduce more sun.
Established French tarragon grows best with at least six hours of light, but a newly rooted plant is not established. The misunderstanding is that tarragon loves sun, so the cutting must love intense sun too. Those are two different stages of growth.
Practical checklist before planting out
- Roots are holding the compost together but are not circling densely.
- The plant has made at least two new sets of leaves.
- Night temperatures are reliably above about 10°C.
- The final spot drains well, especially over winter.
- You can water the new plant during its first two dry weeks.
Plant it at the same depth it grew in the pot. Water it in once, then allow the upper soil to dry slightly between waterings. After it has settled, tarragon is more tolerant of dry conditions than of soggy roots. In heavy clay, growing it in a raised bed or a large terracotta pot is usually the sensible choice.
Do not panic if the parent plant looks tired afterward
Taking a few tip cuttings does not harm a healthy tarragon plant. In fact, light trimming often makes it bushier. What does need attention is a parent plant that collapses in the middle, has sparse growth, or fails to return strongly in spring. French tarragon naturally benefits from division every few years, and an old congested clump can be less productive than a young cutting-grown replacement.
If your cuttings fail repeatedly, do not keep changing every variable at once. Start earlier in the season, use fresher shoots, reduce direct sun, and switch to a grittier mix. Those four adjustments solve far more tarragon-cutting problems than extra fertilizer, more misting, or elaborate propagation equipment.
