A frost-hardy tuber from the mint family that produces strings of small, ridged, ivory knobs with a crisp texture and mild, nutty flavor.
Stachys affinis · also called Chinese artichoke, Japanese artichoke
Windows are counted from the average date of your last spring frost.
Crosne is rarely found in markets, making it a genuinely novel crop for adventurous gardeners. It tolerates light shade, requires almost no inputs once established, and the harvest is simply a matter of digging.
A little history. Native to China and introduced to European horticulture in the 1880s via France, where the village of Crosne gave the crop its common name. The edible portion is a rhizome (underground stem) segmented into tight, bead-like whorls.
Sow seeds 2½ inches (64 mm) deep, and aim for 12 inches (30 cm) between plants once thinned. Plant tubers 2–3 inches deep; keep soil evenly moist until shoots break the surface. Do not let the bed dry out or crust over. Seedlings emerge in 14–28 days.
Water deeply once or twice a week during active growth; reduce once tops die back in autumn. Water when the top 2 inches of soil feel dry to the touch. Aim for about 1 inch per week including rain.
Side-dress (scatter fertilizer along the row and water in) once at planting and once at midsummer. What to use: low-nitrogen balanced organic fertilizer or well-aged compost; excess nitrogen favors leafy growth over tubers.
Pinch out flower spikes as they appear to redirect the plant's energy into tuber production rather than seed set.
It's ready when harvest after the first hard frost kills the tops, typically late autumn. Tubers should be firm, ivory-white, and 1–2 inches long with distinct ridged segments. Loosen the soil with a fork 6–8 inches from the base; lift the entire root mass gently. Pick out tubers by hand — they detach easily. Leave a few small tubers in the ground to re-sprout next season.
Refrigerate unwashed in damp sand or a sealed bag for up to 3 weeks. Tubers discolor quickly once exposed to air — harvest and use in small batches.
Tubers are fully hardy in the ground where winters are not severely dry. Leave them in place and harvest through winter as needed, or lift and store before the ground freezes solid.
Garlic
Garlic's strong smell can help hide low-growing neighbours from pests that hunt by scent, and its narrow upright leaves take up little room in a wide crosne bed. Lift the garlic in midsummer, long before the tubers do their bulking in autumn.
Lettuce
Lettuce feeds in the top few inches while crosne runners spread and swell deeper in the bed, so the two rarely fight over water or food. Lettuce is cut and gone by early summer, leaving the row clear for the long second half of the crosne season.
Spinach
Crosne is slow off the mark, taking two to four weeks to break the surface. A low spinach cover over that same ground shades the soil, holds moisture, and crowds out weeds until the shoots take over; pull it once it bolts (shifts to flowering).
Nasturtium
Aphids often settle on nasturtium in preference to nearby crops, which can pull them off crosne foliage. It only helps if you cut out and bin the infested nasturtium stems rather than letting the colony build and spread.
Spearmint
Spearmint runs underground and will take over a crosne bed in a season. Both crops spread by underground stems, so at digging time you cannot tell one pale runner from the other. Grow mint in a sunken pot or a separate bed well away from the row.
Lemon Balm
Lemon balm seeds itself freely and builds a dense clump that shades out low crosne foliage and mats the top few inches of soil you have to fork through each autumn. Keep it potted or at the far end of the garden.
Easy-going — Crosne can grow almost anywhere in the rotation without a strict rest.
The pea and bean family, the cabbage family or the tomato family thrive in this ground next season.
Crosne is a light feeder that takes little from the bed and banks no nitrogen for the next crop, though its frost-killed tops add organic matter. Leave a year before crosne returns to the same ground. Legumes, brassicas, or the tomato family all follow well once stray tubers are sifted out.
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