© Leonora Enking from West Sussex, England / CC BY-SA 2.0德卡里大戟（Euphorbia decaryi）
Euphorbia decaryi is a small euphorbia native to Madagascar. It grows by spreading sideways through underground rhizomes, while its stems form eye-catching rosettes of leaves at their tips. The leaf margins are strongly wavy and crimped, ranging from deep reddish tones to green depending on the plant, and the foliage often turns a striking coppery color in summer or in dry conditions. Because it spreads outward rather than upward, it suits a shallow, wide pot. The species is listed in CITES Appendix I, and in Japan transfers and displays or advertisements for sale in principle require a registration certificate. Plants sold in Japan are mostly seed-grown, but even so, check whether a registration certificate is available before buying.
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德卡里大戟（Euphorbia decaryi）的基本数据
- 养护难度
- 适合新手
- 寿命
- 多年生（寿命资料较少）
- 体型
- 小型种，株高数厘米。通过根茎横向生长蔓延。
- 浇水
- 夏季施用富含钾的多肉植物专用肥料
- 光照·置放场所
- 喜欢明亮的地方，但不耐盛夏过强的直射日光。光照不足会导致茎徒长，日照充足则叶色更深。
- 浇水
- 这是一个容易因干燥过度而失败的种类。夏季需充分浇水，冬季也不应让基质完全干燥，这样春季生根会更顺利。
- 温度·越冬
- 夏季理想温度约25℃，冬季保持15℃以上较为安全。虽然有轻霜的耐受例，但建议在室内越冬。
- 基质·换盆
- 使用轻石或熔岩砾等无机质为主、排水良好的基质，由于横向生长，应用浅宽的花盆种植。每2至4年换盆一次。
- 繁殖方法
- 可通过分株或扦插繁殖。切口处洗净并清除白色乳液，干燥约2周后再植。种子不易储存，采用随采随播。
- 病虫害·注意事项
- 大戟属的白色乳液会刺激皮肤和眼睛。修剪或换盆时应戴手套，避免接触眼睛或口腔。该种为《濒危野生动植物种国际贸易公约》附录I物种。野生采集株的国际贸易被禁止，因此国内流通的主要为实生苗。即使是实生苗，购买或出售前也应确认是否具有登记证。
关于德卡里大戟（Euphorbia decaryi）
A guide to growing Euphorbia decaryi, a small Madagascar euphorbia known for its wavy leaves and rhizome-spreading habit. Beginner-friendly and easy to care for.
开始养护德卡里大戟（Euphorbia decaryi）前需要了解的7件事
1Placement
Give it plenty of light in a bright spot; the more sun it gets, the deeper the leaf color. Too little light makes the stems stretch. The only thing to avoid is harsh midsummer sun.
2Watering
E. decaryi is often lost by letting it get too dry. Water it well in summer, and even in winter don't let the mix dry out completely, which helps it root smoothly in spring. Use a free-draining, mostly mineral mix.
3Soil
It prefers well-draining soil. A succulent or cactus potting mix, with added perlite for extra aeration, makes it easier to manage.
4Repotting
Because the rhizomes spread sideways, repot into a slightly larger pot once roots start to fill the current one. Repot during the active growing season and handle the roots gently to avoid damage.
5Seasonal Color Change
During intense summer sun or dry spells, the leaves may take on deep red or coppery tones. In periods with less light or moisture, the color tends to shift back toward green.
6Choosing a Plant
Look for a plant with firm, unblemished leaves showing little discoloration or damage. If the rhizome is visible, choose one that feels firm rather than soft or mushy — a sign of a healthy plant.
7Handling the Sap
Like other Euphorbia species, cutting the stems or leaves releases a milky white sap. It can irritate skin and eyes, so wear gloves when handling the plant and wash your hands afterward.
德卡里大戟（Euphorbia decaryi）的常见问题
- Q.Is it easy to grow for beginners?
- A.It's considered beginner-friendly, but be careful not to let it get too dry, which is a common cause of failure. Water well in summer, and don't let the mix dry out completely even in winter.
- Q.How big does it grow?
- A.It's a small species that spreads sideways via underground rhizomes, gradually filling out the pot rather than growing tall, so a shallow, wide pot suits it.
- Q.Why does the leaf color change?
- A.In summer heat or dry conditions, the leaves can take on a striking coppery or reddish hue. This color shift is a natural response to changes in light and moisture.
- Q.What kind of soil does it need?
- A.It prefers well-draining soil. A commercial succulent or cactus potting mix makes it easy to manage.
- Q.Is the white sap from cut stems safe?
- A.It's a milky sap common to Euphorbia species, and it can irritate skin or eyes on contact. Wear gloves when handling the plant, wash your hands afterward, and be careful to keep it away from your mouth.
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