Hi fleur, and Welcome to the orchids forum.
Here's a link I found that might be helpful to you
http://www.orchidworks.com/bra...
Not much help from me here, because I also have trouble with Laelias, although the local botanical garden has them (big lush Laelia anceps, I think) growing 'wild' in their oak trees. I've bought both potted plants and bare-root divisions and had them all, large and small types, die off. I do grow all my orchids outdoors almost year 'round (they're indoors right now for a few cold nights) and most of the time my conditions are pretty good, humidity and light-wise. But of course I also have every insect and fungal disease known to man floating around my garden, so there could be many reasons why those plants didn't make it.
Are you growing your orchids in a greenhouse, or where? Do your orchids go outdoors for the summer? Are your plants mounted, in baskets or in pots?
One of my favorite theories is that some orchids thrive and get healthy and resilient when they have established a nice big clump. With Laelias, I'm thinking I may try one more time if I can find a big division(s) or get my hands on a big plant that I can put on a lovely oak tree branch in my garden. Moving and estate sales around here can yield some real treasures in the way of old, established orchids so I have my eye out.
