小寒 (Shōkan) opens 寒の入り (kan no iri), "entering the cold" — the start of a fixed thirty-day stretch, 寒 (kan), that runs through 大寒 (Daikan, Major Cold) to Setsubun in early February and is reckoned the coldest, hardest thirty days of the entire traditional calendar. Despite that, this kō opens on a plant thriving rather than struggling: seri (Japanese parsley) grows in dense, competing clusters along cold waterways right now, its own name traditionally traced to 競り合う (seriau, "to compete, to crowd together") for the way the young shoots crowd and jostle each other while everything around them is dormant.
Seri is one of the 春の七草 (haru no nanakusa, "the seven herbs of spring") — a slightly misleading name, since all seven are actually gathered now, in the depth of winter, rather than in spring proper. They're eaten together on January 7th, 人日の節句 (Jinjitsu no Sekku), the first of the year's five seasonal sekku, in a dish meant to settle a stomach still recovering from New Year's feasting and to wish for a year free of illness.
Still excellent, though just past its absolute December peak.
In fine season, central to many January nabe meals.
Still everywhere and still cheap — the standard-issue New Year kotatsu fruit continuing into January.
This kō's namesake plant — peppery and aromatic, the anchor ingredient of nanakusa-gayu, also good simply blanched with a little soy and sesame.
Still at full sweetness, central to winter nabe cooking.
Deep in season, excellent long-simmered in oden or grated raw alongside a rich dish to cut through it.
Rōbai's small, waxy, translucent yellow flowers open on bare branches right around now, before a single leaf has returned — one of the few plants that treats deep winter as its actual moment rather than something to simply survive. Its fragrance carries unusually far for such a small bloom, often noticeable from several meters away on a still, cold day.
Eaten on the morning of January 7th: seri, nazuna, gogyō, hakobera, hotokenoza, suzuna, and suzushiro, all finely chopped and simmered into plain rice porridge. The custom folds together a Chinese Han-dynasty practice of eating seven vegetables on the seventh day of the new year with an older Japanese tradition of gathering young winter greens (若菜摘み, wakana-tsumi), and settled into roughly its current form by the Heian court before spreading to the wider population through the Edo period. Beyond the health wish, it's also a practical corrective — a plain, warm, vegetable-heavy dish arriving right when a household's digestion most needs a break from days of rich osechi food.
"Person Day" — The first of the year's five traditional sekku (seasonal festival days), January 7th — named from an old Chinese custom of assigning each of the New Year's first eight days to a different creature (chicken, dog, boar, sheep, ox, horse...), with the seventh day designated humanity's own.
芹 (seri) is traditionally derived from 競り合う (seriau), describing how the plant's shoots crowd and jostle each other as they grow — a name built from the plant's competitive growth habit rather than its appearance, taste, or use, which is fairly unusual among these seventy-two kō.
Pre-cut nanakusa sets are widely sold in supermarkets in the days beforehand — no need to forage the actual seven plants to take part in the custom.
Its flowers are easy to miss visually against bare winter branches, but the fragrance usually gives it away before you spot it.
"Seri, nazuna, gogyō, hakobera, hotokenoza, suzuna, suzushiro — these are the seven herbs."
Stock tends to sell through fast right around January 6th–7th as everyone has the same idea at once.
Nanakusa-gayu is really the opening move of a broader post-New Year pattern — simpler, plainer meals after a stretch of rich osechi food.
This isn't really a poem so much as a shopping list set to a 5-7-5-7-7 rhythm so it wouldn't be forgotten — utility wearing the shape of poetry because the shape happened to be the easiest container available. A lot of what survives from centuries ago wasn't preserved for its beauty; it survived because someone needed to remember seven plant names on a cold January night, and rhythm is simply easier to hold onto than a list. What in your own life is more useful than beautiful, but has quietly earned its place anyway?