Earthworms hatched from eggs laid the previous winter become visible now as the warming soil brings them to the surface in numbers — a far less celebrated seasonal marker than a blossom or a birdcall, but one the old calendar considered worth naming all the same.
One widely repeated explanation for the word みみず (mimizu) itself traces it to 目見えず (me mienazu, "cannot see with the eyes") — earthworms have no eyes at all, only light-sensitive cells across their skin that they use to move away from brightness and toward the dark safety of soil, and the phrase is said to have contracted into the animal's name over time.
Long before soil science had a name for it, earthworms were called 自然の鍬 (shizen no kuwa), "nature's hoe" — their constant tunneling aerates and turns soil in a way farmers recognized as genuinely useful centuries before anyone could explain the microbiology behind it.
Named for the rice-like egg clusters found inside females in spring — small enough to eat whole, usually simmered in a sweetened soy broth.
Greenhouse-grown Japanese melon reaches its first good season now, months ahead of the field-grown fruit later in summer.
Named after the 17th-century Chinese Zen monk Ingen, credited with introducing the bean to Japan — best simply blanched while still bright and snappable.
Milder and less fibrous than mature ginger, pale pink at the stem end — the classic base for quick-pickled gari.
Deutzia's small white clusters give the old fourth lunar month its poetic name, 卯月 (uzuki, roughly this point in the modern calendar) — a flower unglamorous enough that it rarely appears in art, but common enough along hedgerows and roadsides that it quietly named an entire month.
The tea leaves picked around 八十八夜 (the 88th day counted from Risshun, roughly May 1st–2nd) reach shops as shincha through this window — prized above the rest of the year's harvest for a fresher, less astringent flavor, higher amino-acid content, and simply for being first. The old tea-picking song 茶摘み opens with 夏も近づく八十八夜 ("summer draws near, the 88th night"), placing this exact stretch of the calendar, by folk reckoning, right at summer's own doorstep — a sentiment the calendar's own 立夏 agrees with almost to the day.
"Worms come out after the rain" — Not a prediction like #13's swallow saying but a plain observation with real mechanics behind it: earthworms breathe through their skin, and a flooded burrow forces them to the surface to avoid drowning — a folk phrase describing cause and effect that anyone with a garden can still verify the morning after rain.
The folk derivation 目見えず → みみず is repeated often enough to function as settled fact, but it's worth holding a little loosely — like much pre-modern Japanese etymology, it was proposed well after the word itself was already old, and no contemporary record confirms it was the actual origin rather than a satisfying story invented later to explain a word whose real history had already been forgotten.
Earthworms forced to the surface by flooded burrows are easiest to actually see in this narrow window, rather than any other time of year.
Unlike most green tea, which keeps reasonably well, shincha's particular brightness fades within weeks — worth seeking out specifically now rather than assuming any green tea will do.
Worms surfacing to breathe are easy to accidentally harm with a spade during exactly this window — worth waiting a day for the ground to drain first.
Its higher water content and thin skin mean it spoils faster than the tougher root sold the rest of the year.
An earthworm has no eyes and, by the most common explanation of its own Japanese name, is defined by that absence rather than by anything it can do instead — and yet it's remembered, generation after generation, as "nature's hoe," doing genuinely necessary work that had nothing to do with seeing anything at all. What in your own life gets undervalued because it doesn't look like the more visible, more admired version of usefulness?