Stachys affinis – Chinese Artichoke; Artichoke Betony

General Information: A low to mid-sized “edimental” perennial. Attractive pink to purple flower spikes emerge in July and August. Throughout the year, but most abundantly in Spring and late fall, the edible tubers are easily accessible a few inches under the soil. These cream-white tubers have an incredibly interesting spiral shape somewhat reminiscent of a seashell. In the 1800’s, these plants were brought into cultivation in Europe, however they fell out of favor due to their unstable shelf life.

Edible Qualities: Edible raw or cooked. The tubers have a pleasantly earthy flavor similar to an artichoke (hence the name). Although they are somewhat small, they can usually be collected in quantities enough for a side dish to a meal. They are best washed and cooked immediately after harvest, as they begin to degrade quickly once exposed to the air. They should not be peeled either, as removal of the skin quickly degrades the tubers.

Cultivation Details: Chinese Artichoke is useful in areas near paths or in polyculture designs with other root crops such as Potatoes, Yams, Radishes, or Turnips. Attractive to pollinators. Consider planting in areas with loose soil, or where other plants may not be damaged by the soil disturbance that occurs when harvesting the tubers. If planting for ornamental purposes, consider pairing with other aggressive or well-established flowers, as these plants can form small colonies that may discourage the growth of seedlings or delicate perennials.

Growing Requirements: Plant in full to part sun. Prefers moist, well-drained soils. Tolerant of most soil types. Tolerates heavy clay soils, but with some impact on ease of harvesting and tuber size. Suitable for slightly acidic, neutral, or slightly alkaline soils.