三棱大戟

三棱大戟的基本数据

养护难度

适合新手

寿命

多年生

体型

株高1.5～3米

适宜温度

18〜29℃

浇水

需水量少

光照和摆放位置

室内需明亮的间接光线，室外宜半日照。光线不足时茎会细长伸展。

浇水

夏型种。避免过度浇水，待土壤表面下2～3厘米干燥后再浇水。冬季需控制浇水。

温度和越冬

最适生长温度约18～29℃。不耐寒冷，气温下降到7℃前需移入室内。国内图鉴以10℃作为耐寒温度的参考。

土壤和换盆

宜用排水性好的砂质土壤或仙人掌/多肉植物专用土壤种植。因根系浅小，大株容易倒伏，需选择重而稳定的花盆。

繁殖方法

扦插繁殖极易成活。将剪下的枝条放置3～7天使切口干燥后再扦插。

病虫害和注意事项

切口流出的白色乳液有毒，接触皮肤易导致皮肤刺激，进入眼睛会引起严重炎症。修剪和换盆时应戴手套和护目镜，需放在儿童和宠物无法触及的地方。易受粉蚧和红蜘蛛危害。

关于三棱大戟

Euphorbia trigona (African milk tree) is a candelabra-like columnar succulent with three-angled stems that grows 1.5 to 3 m tall. Beginner-friendly and perennial. Learn about light, watering, winter care and more before you start.

开始养护三棱大戟前需要了解的7件事

1. 1Give It Bright Light

   It prefers a bright, airy spot with plenty of light. Without enough light the stems stretch and turn thin, spoiling the shape. If you move it outdoors, acclimate it gradually, because a sudden switch from indoors to strong sun can scorch the stems.

2. 2Water Only When Dry

   During the growing season from spring to autumn, water thoroughly once the soil has dried out completely, until water runs from the drainage hole. The stems store water, so overwatering can lead to root rot and soft stems. When in doubt, it is safer to water less.

3. 3Soil and Pot Choice

   A fast-draining cactus and succulent mix suits it well. Because it grows tall and becomes top-heavy, choose a stable pot that will not tip over easily. Use a pot with drainage holes and never leave water standing in the saucer.

4. 4Repot in Growing Season

   When the roots fill the pot, repot into a slightly larger one in spring or early summer, when temperatures are rising. This perennial can eventually reach 1.5 to 3 m tall, so plan to move up in pot size as it grows. After repotting, wait a few days before watering to let the roots settle.

5. 5Warm and Dry in Winter

   It dislikes cold, so bring it to a bright indoor spot protected from frost and chills, ideally staying above about 10°C. Growth slows in winter, so water very sparingly and keep the soil on the dry side. Losing a few lower leaves in winter does not necessarily mean the plant is in trouble.

6. 6Mind the White Sap

   Cutting or damaging the stems or leaves releases a milky white sap. It can irritate the skin and eyes, so wear gloves and goggles when pruning or repotting. If it gets on you, rinse with water right away, see a doctor if discomfort persists, and keep the plant out of reach of children and pets.

7. 7Choosing a Healthy Plant

   Look for firm stems without scars, discoloration, or mushy patches. A base that does not wobble and leaves or new growth between the paired spines are good signs. Compare the photos and size details on the listing, and check that the plant will fit the space you have.

三棱大戟的常见问题

Q.Is it suitable for beginners?

A.Yes, its growing difficulty is rated beginner-friendly. Give it bright light, water only after the soil dries, and keep it warm and on the dry side in winter. Avoiding overwatering is the main thing to watch.

Q.How big does it get?

A.It is a perennial that grows 1.5 to 3 m tall. It gains height gradually over the years, so allow for ceiling height and room to spare when choosing a spot. You can trim it to control the height, but wear gloves because of the sap.

Q.Does it flower?

A.It is known for not flowering in cultivation. Its appeal lies instead in the candelabra-like three-angled stems and the teardrop-shaped leaves.

Q.Why are the leaves dropping?

A.The teardrop leaves can drop with winter cold, low light, overwatering, or a change of environment. If the stems are still firm, review the light and watering and wait and see. If the stems feel soft, root rot is possible, so stop watering and let the soil dry out.

Q.How is it different from a cactus?

A.They look alike, but this plant belongs to the spurge family, not the cactus family. One way to tell them apart is the milky white sap that appears when the plant is cut or damaged. Its fleshy stems store water, so the basic rule is to water only after the soil has dried.

三棱大戟种植的实用工具

在图鉴中详细了解三棱大戟

同分类的更多品种