I concur with Jim Kawasaki ..though I'm not sure how much would be applicable to Costa Rica. In case Guest Orchids still has copies you can try emailing Graham at
guestorchids@bigpond.com. I've Got Spikes is probably worth reading for general info on Cymbidiums, but if you are growing them by now you should know most of what's in these books.
What you are seeking however is very specialized and not common information for most Cymbidium growers. All the Calif growers are blessed on the coast of Calif with cool nights and warm days, especially in spring and summer. Ideal for cymbidiums so they can basically just feed and water and they will bloom nicely. Even Andy in Florida or Kobsukh in Thailand will be different than you as they are working with Heat tolerant cymbidiums NOT warm tolerant. Costa Rica (though I haven't been there since 1978) as I remember has similar conditions to what I have here which is more like temps in the mid 50's to mid 80's with the scale shifting a bit seasonally while the day night difference is not very extreme. This necessitates two things as I indicated. Selection of cymbidiums that do not have the absolute requirement of a 15-20+ degree F difference between day and night, and second some period of nitrogen deprivation with potassium boost.
To find these requires some work on your part. As is well known there are some that will do this. Especially the ensifolium derived hybrids, ie Peter Pan offspring, Golden Elf etc. To get larger flower sizes and colors these have been bred with larger more colorful ones. Some of these crosses will work in a warm environment, some won't. Ie crossing with the likes of Red Beauty, or Balkis 'Nevada' etc will be more warm tolerant. And in many cases it is often very specific clones of the larger flowered standards that have warm tolerance in the background.
One other hint is that often pure color varieties such as pure white and pure green and pure yellow are often more tolerant.
Net result is you really have to try these under your conditions. I'm constantly amazed as to what blooms that is labeled as cool weather. Ie Sarah Jean 'Ice Cascades' seems to bloom more freely here in Hawaii than it does in Calif. Go figure.
Some crosses based on some species will depend on where the orig species was gathered from, ie high up the mountain or lower. Pumulum crosses for example can be both warm and frustratingly poor for warm. The poor ones frequently set buds early in the season, and then sit in bud stage for 5-6 months and then die. Others bloom later and are very tolerant. Some of the Mimi's are both ways.
Hope this helps.
Bob
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