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Abgeschickt von Alastair Robinson am 14 Dezember, 1999 um 17:46:34
Antwort auf: Re: C. tibeticum von Magnus Persson am 14 Dezember, 1999 um 10:58:04:
It is good to see that you have access to the forum; your reputation precedes you, as I have heard your name mentioned in conjunction with Cypripedium in the past (and also through Björn Johansson's page).
Do you use pumice, primarily, to grow your plants? I thought that you might, as this is what some other Swedish growers use. If not, this substrate, and also perlite and vermiculite are rather good inorganic components that will help to retain water. The addition of a small amount of good loam and fine sand to an inorganic mix will improve the water retention capacity of the soil a good deal - of course, as you know, this should be done carefully so as not to include too much, which may lead to rotting.
There are other methods too - one can use a heavier (more organic rich) soil on top of a very good drainage layer of gravel or coarse grit, which is rather more like the natural conditions. Also, pots of inorganic compost can be covered with a thick layer of bark or good leaf litter over the surface - this will prevent excessive evaporation, and will work even better if pots are sunk into the ground. This idea might be more easy for you to try, if you have not already done so, as you won't have to repot all of your material.