Gadenin日本語Get the appThree ways to pick, and what each costs you
Tatsoi can be harvested as a whole rosette, as individual outer leaves, or sheared as baby leaf, and the three are genuinely different crops rather than variations of the same one. Choosing deliberately is worth doing, because switching halfway through gives you the worst of each.
Picking outer leaves is the method that gets the most out of a winter plant. Snap or cut the outermost leaves at their base, working around the rosette and never taking more than a third at once, and the plant keeps pushing new leaves from the center for months. This is the right approach for a stand you intend to carry through the cold.
Cutting the whole rosette is the right call when you want a full head for the kitchen, or when hard weather is coming and you would rather have the crop than gamble on it. Cut about an inch (2.5 cm) above the soil, above the growing point at the center of the crown, and the plant will push a second, smaller flush. Cut flush with the soil and it is finished.
| Method | Where to cut | Regrowth | When to use it |
|---|---|---|---|
| Outer leaves | At the base of each leaf stem | Continuous for months | Full rosettes through autumn and winter |
| Whole rosette, cut high | 1 in (2.5 cm) above soil | One or two smaller flushes | A full head for the kitchen |
| Whole plant, lifted | Below the crown, with the root | None | Clearing the bed, or before severe cold |
| Shear a baby leaf band | 1 in (2.5 cm) above soil | 2 to 3 more cuts | Thickly sown salad, not winter plants |
When it is ready, and how the flavor moves
Tatsoi is edible from the thinning stage onwards, so readiness is about what you want rather than whether it is safe to pick. Baby leaves at two to three inches (5 to 8 cm) are mild, tender and sweet with only a hint of mustard. A full rosette at nine to twelve inches (23 to 30 cm) across has a rounder, deeper flavor with a distinct nutty note, and the thick white leaf stems become as good as the blades.
Cold makes it better, and by a noticeable margin. Frost converts starch in the leaves to sugar, so a plant picked after several hard frosts is markedly sweeter than the same plant picked in mild autumn weather. Growers who only ever eat autumn tatsoi have not really tasted it.
Pick in the morning if you can, and in freezing weather wait until midday. Frozen leaves are brittle, bruise as you handle them, and go to mush as they thaw in the kitchen. Give them an hour of sun to thaw on the plant and they cut crisp.
| Stage | Days from sowing | Flavor | Best use |
|---|---|---|---|
| Thinnings, 2 in (5 cm) | 18 to 25 | Very mild, sweet | Raw, whole seedling and all |
| Baby leaf, 3 to 4 in (8 to 10 cm) | 25 to 35 | Mild with a faint mustard note | Salad base |
| Half-grown rosette | 35 to 45 | Nutty, stems crisp | Mixed salad, quick wilting |
| Full rosette after frost | 50 plus | Sweet, deep, stems succulent | Braising, soup, stir-fry, or raw |
Washing: the part nobody warns you about
A plant that grows lying on the ground collects soil, and the tight overlapping bases of tatsoi leaves hold grit in a way loose upright greens do not. Rain splash drives soil into the center of the rosette, and a plant harvested whole and rinsed under a tap will still be gritty on the plate. This is the most common complaint about home-grown tatsoi and it is entirely solvable at harvest.
- Cut high and separate at the sink, not in the garden Take the rosette an inch (2.5 cm) up, carry it in whole, then cut each leaf away from the base individually over the sink. The grit is concentrated in the last inch of the stems, and separating the leaves is what lets the water get at it.
- Soak, do not rinse Fill a bowl or a clean sink with cold water, put the separated leaves in, and swish them well. Lift the leaves out of the water rather than pouring the water off, so the grit stays in the bottom. Change the water and repeat until the bottom of the bowl is clean, which is usually twice and sometimes three times.
- Dry before storing Spin or pat the leaves dry. Tatsoi washed and stored wet goes slimy within two days, whereas dry leaves in a loose bag or lidded box keep well for five to seven days in the fridge.
Only wash what you are about to use if you can help it. Unwashed rosettes keep considerably better than washed ones, so bring in what the kitchen needs rather than harvesting the row and washing it all at once.
Getting the longest run out of a plant
A well-grown rosette harvested by the outer leaves will supply a household through most of the winter, and the way to get that is restraint: never take more than a third of the leaves at one visit, and always take the outermost ones so the growing center is untouched. A plant stripped hard in cold weather cannot replace those leaves until light returns, and it may sit doing nothing for six weeks.
Once you see a thickening bud in the center of the rosette, the run is nearly over. From that point the older leaves toughen quickly and you have perhaps a week or two of good picking, so cut the whole plant and use it rather than continuing to take leaves off a plant that is now spending everything on a flower stem.
Note the date of each first pick and the date each plant ran out, along with its sowing date. Two seasons of those pairs of dates tell you how long a plant lasts in your conditions at each time of year, which is exactly the number you need to decide how many to sow and when.