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发表于 2010-2-6 22:41
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来自： 中国江苏南京
找了篇帝玉的文章大家有兴趣的看一下。
Pleiospilos nelii（帝玉）
Split Rock Plant
Mar 21, 2007 Ian Nartowicz
Pleiospilos nelii is the popular split rock plant, looking like a piece of greenish speckled rock, and with a perfectly straight cleft right down the middle.
Many people will have seen a nearly spherical green plant, perhaps mistaking it for a Lithops, possibly not even realising it was a plant at all. Pleiospilos nelii (P. nelii to its friends) is a popular novelty plant and you may even have owned one yourself at some time. Probably almost as many people have killed one and only a lucky few will have seen the spectacular flowers.
Not a Lithops
P. nelii is in the same plant family as the Lithops, sometimes it will even be labelled as a Lithops, but it isn't the same. There are two immediate visual differences: P. nelii does not grow buried to its neck in the ground; and it is bigger than any Lithops. The round leaves naturally sit above the surface of the soil and can grow to about four inches across. Mostly there will just be one head, but very old plants will form two and eventually more heads.
There are some other differences not so easy to spot. P. nelii usually flowers in spring, although some plants can flower in autumn like a Lithops, depending on how they are grown. Quite commonly a single pair of leaves will produce multiple flowers at once, something that Lithops never do. The flowers themselves are large, orange or orange-yellow, and have a great many petals.
There is actually a whole genus of Pleiospilos plants, mostly with longer thinner leaves than P. nelii, less rock-like but still with the same speckled grey-green appearance.
Growing a Split Rock
For many gardeners, growing P. nelii is not as easy as killing it. It is an extreme succulent plant from a barren hot environment in South Africa. For most people, planting it in the garden is just not an option, it is not frost-hardy, it will rot if it stays wet, and will become mis-shapen and possibly die if it is more than a few times per year. For an idea of how succulent these plants are, a mature specimen can easily go a whole year without any water in a typical European or North American climate.
So the first rule is to plant into a soil that drains quickly and doesn't retain much water. A clay pot may be a good idea in cooler or more humid areas. All Pleiospilos species like to be watered lightly and frequently (frequently compared to a cactus!), rather than a heavy watering followed by many weeks dry.
P. nelii is a very adaptable plant, it will grow whenever it has water and good sunlight, but it will become dormant in very hot weather to conserve water. Like Lithops, it will produce a new pair of leaves from between the old ones during the winter, then the old leaves should be consumed to return to the split rock shape. A plant that retains its old leaves right through the summer is being overwatered, it may not flower and is at risk of rotting and dying. P. nelii loves direct sun and warmth. Always aim for a nice round split rock and never overwater, the recipe for success with this fascinating plant.
其中养护方面的摘要：
~在潮湿环境容易腐烂，如果一年透水（watered heavily）超过有限的几次，就可能会长走形或者挂掉，
~帝玉喜欢少量多次地浇水（次数多是相对仙人类），不喜欢一次透水以后干几个星期（更遭的是透水以后干了马上或者没干就再透水，俺说的）
~只要有水分和良好光照任何时候都可以生长，非常非常热的气候条件下会休眠。（俺认为中国大部分地区不存在足以让它休眠的条件）
~和生石花一样，冬天蜕皮长新叶
~如果夏天的时候旧叶还在（声动图片里面那样），那就是浇水过多了，可能会不开花、腐烂或者，挂掉。
从这篇文章里面看，帝玉习性大体类似生石花，但是需水更少。国内流行的夏天要断水的说法又是瞎扯淡。 |
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发表于 2010-2-6 23:11
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