© sunoochi from Sapporo, Hokkaido, Japan / CC BY 2.0紅兜蘭（Cypripedium macranthos var. speciosum）
Atsumori-so is a Japanese native orchid prized for the large, reddish-purple, pouch-shaped flower each stem produces. It grows wild in the cool grasslands and bright woodlands of Hokkaido and the highlands of Honshu, and its name is said to come from the flower's resemblance to a cloak worn by a legendary samurai. Alpine plant enthusiasts have treasured it for its unusual form for a long time. Because it calls for a cool growing environment and careful soil management, it's generally considered a plant for more experienced growers. It is designated a Specified Class I National Endangered Species under Japan's Act on Conservation of Endangered Species, and collecting wild plants is prohibited in principle. Plants on the market are artificially propagated, and anyone selling or distributing them as a business must file a notification as a specified domestic species business. Displays and advertisements, including online listings, are required to show the notification number and the business name, so check for this information when buying and never purchase wild-collected plants.
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紅兜蘭（Cypripedium macranthos var. speciosum）的基本資料
- 栽培難度
- 適合高級者
- 壽命
- 多年生（壽命資料稀少）
- 體型
- 高度30～50公分
- 澆水
- 生育期間施用稀釋液態肥料應適量
- 日照・放置位置
- 這是生長在草原和明亮林地的植物。春季充分日照，夏季避免強光和高溫，放置在半陰處。
- 澆水
- 生育期間避免介質過乾，確保排水和通風以防悶根。
- 溫度・越冬
- 作為寒冷地植物，在暖地需保持涼爽以防夏季氣溫過高，據說栽培極其困難。冬季耐寒，休眠中也需接受寒冷。
- 介質・換盆
- 用排水良好的介質種植。在地上部枯萎的休眠期進行換盆。
- 休眠期管理
- 秋季地上部枯萎進入休眠。休眠中也應避免介質完全乾燥。
- 病蟲害・注意事項
- 是特定第一類國內稀有野生動植物。禁止採取野生植株。購買時，請確認販售者是否在陳列・廣告上顯示特定國內種事業備案編號和業者名稱，並選擇人工繁殖株。
關於紅兜蘭（Cypripedium macranthos var. speciosum）
A guide to Atsumori-so, a Japanese native orchid with striking reddish-purple pouch-shaped flowers. Learn its key features, growing tips for this advanced-level plant, and answers to common questions.
開始照料紅兜蘭（Cypripedium macranthos var. speciosum）前需要了解的7件事
1Sun in Spring, Cool Shade in Summer
Atsumori-so grows in grasslands and bright open woods. Give it plenty of sun in spring, then move it to a cool, well-ventilated spot in partial shade in summer, away from strong sun and heat. Try to recreate the cool highland conditions it grows in naturally.
2Water With Clear Wet-Dry Cycles
Water thoroughly once the surface of the soil has dried out, but avoid letting the pot stay constantly wet. In summer especially, water in the morning and make sure excess moisture doesn't linger around the roots, since the plant is prone to rot in humid conditions.
3Use Fast-Draining Soil
Because the roots are sensitive to excess moisture, drainage and aeration are the most important qualities in the growing medium. A mix formulated for alpine or woodland plants, based on kanuma soil with pumice added for extra drainage, works well.
4Repot During Dormancy
The best time to repot is during dormancy, from autumn through early spring after the foliage has died back. Handle the root ball gently without breaking it apart too much, remove the old soil, and replant it in fresh growing medium.
5Manage Temperature by Season
Keep the plant cool through its growing season; the foliage dies back in autumn and it goes dormant. It is very cold-hardy, so keep it exposed to winter cold even while dormant. Don't let the soil dry out completely during dormancy.
6Check Roots and Buds When Choosing a Plant
When selecting a plant, look beyond the visible foliage and check that the roots are firm and the growth buds are healthy. Since artificially propagated plants vary in condition, choosing a vigorous specimen makes a real difference for long-term care.
7Ensure Good Airflow to Prevent Disease
Good air circulation is essential to prevent damping-off and gray mold caused by excess humidity. If you notice any damaged leaves, remove the affected parts promptly and avoid crowding plants too closely together.
紅兜蘭（Cypripedium macranthos var. speciosum）的常見問題
- Q.Can beginners grow Atsumori-so?
- A.Atsumori-so is generally considered a plant for experienced growers rather than beginners. It requires specialized care, such as maintaining cool conditions and well-draining soil, so it's a good idea to build up experience with alpine plants first.
- Q.How large does it grow?
- A.Atsumori-so typically reaches a height of about 30 to 50 cm. It's a perennial, so the foliage dies back during dormancy and re-sprouts the following season.
- Q.Can it be grown indoors?
- A.Since Atsumori-so prefers cool, well-ventilated conditions and dislikes heat and humidity, it's usually best kept outdoors or on a balcony where it gets natural airflow. If you do grow it indoors, pay close attention to temperature, humidity, and light levels.
- Q.What do the flowers look like?
- A.Each stem produces a single large, reddish-purple, pouch-shaped flower at its tip. This distinctive shape is what has made the species popular among alpine plant enthusiasts for a long time.
- Q.When is the best time to repot it?
- A.The ideal window is during dormancy, from autumn through early spring, after the foliage has died back. Avoid repotting during the spring-to-autumn growing season, since it puts more stress on the plant.
紅兜蘭（Cypripedium macranthos var. speciosum）栽培的實用工具
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