Species Spotlight ~ Orostachys

Species Spotlight ~ Orostachys

Orostachys — The other, cold-hardy rosette succulents!

Orostachys (Or-oh-STACK-kiss) is a small genus of succulents native to the mountain regions of China, Japan, Korea, Kazakhstan, Russia and Mongolia. The elegant, rounded rosette forms are reminiscent of Sempervivum. Like semps, Orostachys have a “hens and chicks” growth habit and are impressively cold-hardy. You may not have heard of them before — they are hard to find but so rewarding to grow. Let’s learn more about these hardy succulents.

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All About Growing Orostachys

Orostachys malac in bloomophylla var. iwarenge, - cold hardy succulents
Orostachys malacophylla var. iwarenge, photo credit British Cactus and Succulent Society

Orostachys form a central rosette with smaller, rosette-shaped pups coming off the mother plant. The pups are attached to the mother rosette by modified stems called “stolons”. The leaves are much more rounded than those of Sempervivum. After 2-3 years, Orostachys form tall, conical spires of closely packed blooms in fall. These showy bloom stems give rise to the common name of Chinese dunce cap succulents.

Orostachys are monocarpic succulents. The mother rosette that forms the bloom spire will die after the blooms fade. But not to worry — first, many pups are formed to result in more and more Chinese dunce caps to come. In winter, Orostachys go dormant and die back to the ground. But they come back lush and full when spring returns.

Orostachys thrive in nutritionally poor, fast-draining soil. Plant where they will receive full sun.



Orostachys – Ground Cover Succulents

Orostachys malacophylla - Chinese Dunce Cap plants
Orostachys malacophylla, photo credit Mountain Crest Gardens

Orostachys form dense mats of low-growing silver or green foliage. They form a handsome ground cover. Chinese dunce caps grow quickly, especially with regular watering. Once established, they are as drought tolerant as most succulents. These tough little plants are highly effective in rock gardens, raised beds and containers. Amend the garden soil with pumice to improve the drainage.

Orostachys have a shallow root system, so they will thrive in shallow containers like bonsai pots. In time, the baby rosettes will spill over the edge of any container, adding tremendous charm.

Orostachys — Cold Hardy Succulents

Orostachys spinosa - Chinese dunce cap plant
Orostachys spinosa, photo credit FarOutFlora (CC BY-NC-ND 2.0)

All Orostachys species form rosettes, but the shapes and colors vary. Chinese dunce caps are cold hardy succulents, though some are more cold-hardy than others. All will withstand temperatures in climate zone 6, -10° F (-23.3° C). Some will thrive outdoors year-round even in zones 4 and 5. They form a chemical akin to anit-freeze that prevents water from crystallizing within their cell walls when the temps drop below freezing. This is the essence of winter hardy succulents.

Orostachys spinosa, shown above, has an intriguing growth pattern. The central leaves form a Fibonacci sequence. Overall, the plant reminds me of a sunflower! Exceptionally cold hardy, O. spinosa thrives where winters reach -30°F (-34.4° C). It can actually photosynthesize through snow cover!

While Chinese dunce caps are winter hardy succulents that shrug off sleet and snow, they perform best where winters are relatively dry. Rather than frequent cycles of snow and thaw, where the ground gets drenched, they do best where snow packs remain in place until spring. If you are planting Orosctachys where you receive frequent winter rains or multiple snow thaws, consider planting on a slope and be sure to amend the soil so it drains rapidly.

Propagating Orostachys

Orostachys malacophylla var. iwarenge - hardy succulent
Orostachys malacophylla var. iwarenge, photo credit Mountain Crest Gardens

Orostachys form wide mats of densely packed rosettes. The plants propagate themselves by forming offsets connected to the mother plant by horizontal, modified stems, called stolons. In time, the baby plant reaches the soil and roots in. The stolon eventually dries and breaks, leaving an independent plant.

You can propagate Orostachys by removing a pup and snipping the stolon. It is quicker and easier when the pup has already formed a network of roots. Chinese dunce caps can also be propagated by individual leaves.

Is Orostachys Toxic to Pets?

this symbol marks pet-safe succulents
Pet Safe Succulent

Cold hardy Orostachys is non-toxic and entirely safe to grow around cats, dogs and small children —even if they nibble!

This symbol denotes pet-safe succulents. For more information about succulents and pets, just click on this image anywhere on this site.


Orostachys Pests

Orostachys minutum - Chinese dunce cap plants
Orostachys minutum, photo credit Mountain Crest Gardens

Orostachys are easy to grow, without serious issues with disease or pests. Mealybugs can become a problem, especially where soils poorly drain. They tend to collect between the tightly packed leaves of the plant, making the insects difficult to reach with isopropyl alcohol. Pests are easily prevented from troubling your Chinese dunce caps. Just work some dry worm castings into the soil when you plant the Orostachys. Or add it as a top dressing to established plants. Worm castings are my preferred method of pest prevention for all succulents

Orostachys malacophylla var. aggregata from Mountain Crest Gardens
Orostachys malacophylla var. aggregata, photo credit Mountain Crest Gardens

Orostachys are elegant and charming succulents that deserve a place in your garden. But they can be difficult to find. Mountain Crest Gardens is a great source, probably because they have the finest selection of cold hardy succulents I have found. While these beauties thrive in the cold climate garden, they are also lovely in mixed succulent arrangements!

Are your currently growing Orostachys in your garden? If not, do you plan to? I would love to know! Please take a moment to leave me a comment and let me know! I’ll get right back to you!

’til next time, Stay safe and plant succulents!

P.S. – For more great succulent information, please subscribe and receive my FREE course, 7 Steps to Succulent Success! Thanks!

All about growing orostachys Chinese dunce cap plants
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This Post Has 2 Comments

  1. Jane

    So informative, thank you.
    Do you think the heat in northern Fl killed off mine?
    Soil was well draining but not poor-
    so now I know!

    1. Kat McCarthy

      Hi Jane,
      While your Orostachys may have suffered from the heat and humidity in Florida, don’t forget that they go dormant in winter, when the top growth dies back to the ground. If you mistake dormancy for death and discard the plants, you won’t get to see them come back in the spring.
      Thanks so much for reading! 🙂
      ~Kat

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