Stachys affinis is a perennial herbaceous plant in the family Lamiaceae, commonly known as the Chinese artichoke, Japanese artichoke, or crosne. It is native to northern China and was introduced to Europe and North America in the late 19th century, gaining particular culinary fame in the French village of Crosne. The genus name Stachys is Greek for "ear of grain," referring to the spiked arrangement of its flowers, while the species epithet affinis is Latin for "related" or "similar," denoting its resemblance to other members of the mint family. Historically, it has been a staple winter vegetable in East Asian cuisines and was once a fashionable "gourmet" tuber in Victorian-era European horticulture.

The plant is characterized by its rough, nettle-like leaves and small, pink-to-purple flowers. However, its primary value lies beneath the soil, where it produces small, pearly-white, multi-segmented rhizomes that resemble a string of beads or a spiral shell. As a member of the mint family, Stachys affinis is hardy and can be somewhat invasive in home gardens if not contained. It thrives in well-drained, sandy soils and is typically harvested in late autumn or winter after the foliage has died back, as the tubers require the cold to maintain their crisp texture.

Stachys affinis provides edible tubers that are prized for their crunchy texture and delicate, nutty flavor, which is often compared to a cross between an artichoke heart and a water chestnut. In East Asian culinary traditions, specifically in China and Japan, the tubers are frequently pickled (as in the Japanese osechi-ryori dish chorogi) or fermented to preserve their crunch. In French cuisine, they are typically sautéed in butter, blanched, or added to salads. Because the tubers have very thin skins, they do not require peeling but are notoriously difficult to clean due to their convoluted, segmented shape.

Nutritionally, the Chinese artichoke is unique among root vegetables because it stores its energy as stachyose, a tetrasaccharide, rather than starch. This makes the tubers lower in calories and gives them a low glycemic index, though it can lead to digestive gas in some individuals. The plant contains a variety of bioactive compounds, including phenylethanoid glycosides like acteoside and various flavonoids that exhibit antioxidant and anti-inflammatory properties. Traditional Chinese Medicine has long utilized the plant to treat respiratory ailments and to improve circulation, and modern pharmacological studies have investigated its potential neuroprotective effects.