The hedges are all the same height. Jōnai Suwakōji sits on a river terrace above the Kitakami, where samurai houses and storehouses survive along lanes laid out in a grid. Hedges and earthen walls line both sides, trimmed to something slightly above head height, so that walking through it you see a long strip of sky and almost nothing of what lies beyond the green. The district was designated a preservation area in 2001, which changed the paperwork rather than the daily routine.

Most of the houses are lived in, which changes the character of the place entirely. Gardens are maintained because somebody lives with them, not because a schedule requires it, and you can hear the difference: shears rather than machinery, in the middle of a weekday. Kitakami and Mizusawa are twenty minutes away by car, and there is work in the industrial parks nearby, so this is a commuter's address as much as a historic one. That combination is rarer than it sounds; most places choose one or the other and let the second go.

An enclosure built for defence needs domestic maintenance to survive. A hedge is not a wall; it grows, and left alone for a decade it becomes a different landscape altogether. What has preserved these lanes is not the designation but the fact that somebody cuts them every year, which is a less dignified explanation and a more reliable one. The height is the giveaway: it is set where a person can work comfortably with shears, and it has stayed there through several changes of ownership, which is a form of agreement nobody appears to have written down.