Artemisia keiskeana aka False Wormwood

Artemisia keiskeana is straightforward to grow for gardeners with sunny, well-drained conditions. It tolerates poor soils, a wide soil pH range, and drought once established. The main risk is root rot if grown in heavy, wet, or poorly drained soil. It requires minimal inputs and is rarely troubled by pests.

The plant is a rhizomatous perennial reaching 0.6 m in height, with sources reporting a height range of 30–100 cm. Its strongly rhizomatous root system allows it to spread vegetatively over time. The stems are branched and somewhat woody at the base.

Artemisia keiskeana tolerates both dry and moist soil conditions and is drought-resistant once established. It does not tolerate waterlogged or poorly drained soils and is prone to rot in consistently wet conditions. Water sparingly, particularly in winter.

Grows in light (sandy), medium (loamy), and heavy (clay) soils. Prefers well-drained conditions and a pH ranging from mildly acidic to alkaline. A warm, sunny position with well-drained soil is ideal; established plants perform well even in poor or dry soils.

The species is native to temperate East Asia including regions with cold winters, and the genus as a whole is noted to be suitable for USDA Zones 3–8. It is a cold-hardy perennial that dies back to the rhizome in winter and re-sprouts in spring.

Flowers from August to November. Seeds ripen September to November. Propagation by division is best done in spring or autumn. In cold climates, top growth dies back in winter; cut back dead stems before new growth emerges in spring.

As a member of the Artemisia genus, the foliage is aromatic. The genus is well known for its characteristic pungent, camphor-like or sage-like scent, particularly when the leaves are crushed. Species-specific scent character for A. keiskeana is not separately described in available sources.

Flowers appear from August to November and consist of small, inconspicuous yellow-white heads typical of the Artemisia genus. Pollination is by insects. The flowers are not considered ornamentally significant.

Artemisia keiskeana is strictly an outdoor plant, native to roadsides, dry slopes, shrublands, grasslands, and forest margins in East Asia at 100–900 m elevation. It thrives in full sun to semi-shade in well-drained soil. It is hardy across a wide temperature range and is not suitable as a houseplant.

Cut back dead or untidy growth in late winter or early spring before new shoots emerge. The rhizomatous habit means the plant will regenerate reliably from the base each season.

The plant can be propagated by seed (surface sow late winter to early summer), by division in spring or autumn, or by basal cuttings. Division of the rhizomatous clumps is the most reliable method for maintaining named selections.

Root rot is the most significant problem, occurring in poorly drained or overly moist soils. The genus is generally resistant to browsing by deer. As with other Artemisia species, occasional fungal issues may arise in humid, poorly ventilated conditions.

Flowers are pollinated by insects. The flower heads are small and inconspicuous, typical of generalist insect-pollinated Asteraceae.

The young leaves and shoot tips of A. keiskeana are edible when cooked and have been used as a famine food in East Asia. They provide approximately 5.6% protein, 1.2% fat, 9.5% carbohydrate, and 2.6% ash per 100 g. Raw consumption is not documented; cooking is required. The edibility rating is 2 out of 5.

The seeds have traditional use in East Asian medicine for impotence, amenorrhoea, and post-partum pain. The broader Artemisia genus has been used historically in traditional Chinese, Hindu, and European medicine for gastrointestinal and gynecological concerns. Clinical evidence for the genus as a whole is limited, and safety in pregnancy is contraindicated. The medicinal rating is 1 out of 5.

The stalks are used as thatching material in traditional construction in East Asia. The aromatic foliage of Artemisia species more broadly is used in wreaths, floral arrangements, sachets, and potpourri. The other-uses rating is 2 out of 5.

False Wormwood’s native range is E. Asia - China, Japan, Korea and eastern Russia.

False Wormwood requires abundant, bright and direct light. Placing it less than one foot from a window is the best way to make sure the plant receives enough light to survive and thrive. Depending on your region, however, the current weather can affect the placement of the plant in your home. For example, in some areas the sun may be too direct and intense, so it's best to place it farther away from the window. You may also need to adjust your placement according to the season as the sunlight can change intensity over the course of the year. If you live in a region with significant temperature fluctuations, such as a desert, you may need to place the plant a bit farther away from the window to avoid extreme heat or cold. With some care and attention, your False Wormwood will be sure to bring you many years of beauty and enjoyment.

Ploi does not possess verified information regarding the toxicity of this particular plant. In the event that you, a member of your family, or a pet ingests plant material with an unclear toxicity level, it is highly recommended to seek the advice of a medical professional.