The East Asian Cymbidium Mix (from japan) comes already mixed, will solve all these problems about the soil. It is ready to use with the correct pH (5.5.6-5). East Asian Cymbidiums (ensifolifum, sinense, kanran, goeringii, faberii) has very specific soil requirements. The soil is mixed with hard kanuma, yaki akadama in a specific ratio and specific pumice grain size to achieve the pH range and other properties. With other subsituted materials, I think the pH range is off and it is too dry around the roots, so they never bud. It has nothing to do with the temp. I don't know where people get the idea that they need cooler nights to bud or they are cool growers. In Taiwan, summer time is between 28C-32 C at all times with 100% humdity feeling like the 60C. In the fall, it is between 20C-25C. There is very temp change between the day and night, so I don't really understand where these ideas come from. Pretty much all the ensifolium and sinense are from Taiwan in the US/Canada. In my experience, when it is potted in Japanese Cym. mix, all these species just bud naturally without me doing anything as long as they are healthy. After they bud, you need to keep them cool or cold (depending on the species) so they can be bloomed successfully in late winter or spring.
Cym. ensifolium=they bud any bloom anytime anywhere from April to Nov.
Cym. sinense=bud in the fall, bloom next year Jan-Feb.
Cym. kanran=buds in sept-Oct, bloom in Dec and jan
Cym. goeringii= buds in late july, and blooms next year March
Cym. faberii=buds in august/sept, blooms next april.
goeringii, (tortisepalum, longibracteatum), and faberi are the species that require vernalization.
Sinense and kanran, once they bud, you just have to keep the plants on the cooler side (15C average) to maintain the buds before they bud.
Ensifolium, you do nothing, they just bud and bloom freely.
I am trying to explain that the temp fuzz is nonsense, I believe the potting soil is probably the most important factor to grow these East Asian Cymbidiums successfully. In Asian, at any given day, the diurnal difference is no more than 5C in any day, the temp rises slowly and decreases slowly throughout the year like staircase. If you have lived in Asia, you know.
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