Sarah, orchids can grow in anything or in nothing at all. What you pot your orchids in is only one of the requirements to giving them what they need. So, if you've already provided good air movement and light, because Dends. and Cattleyas typically like a lot of light and where you have them growing, can then be determined what you pot them in.
In general, I can tell you that Cattls. and Dends. need to dry out and can remain dry longer than most genera. Seedling and younger orchids. will need to dry but followed up with watering sooner than matured ones. A medium of choice for a lot of growers is bark ( mixed with some charcoal and perlite). If mounted, sphag. near it's roots to provide some moisture. Growers are having a lot of success with LECA as well. I know of a nursery near my home where they grow all their Catts. and Dends. in Hydroton, nothing else. The Phals. get some coir, charcoal and perlite added but the Cattleyas get nothing but the Hydroton.
Whatever mix you choose, remember to let these 2 dry out inbetween watering, good air circulating and high light.
Best of luck with this and let us know if you need more specifics.
Happy growing!
Last edited by Sandy4453; 10-24-2007 at 11:02 AM..
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