mjd, my orchid story started similarly to yours. But on a smaller scale, I'm sure.
I killed several cattleyas, two dendrobiums, and several phalaenopsis in the early to mid-'80s.
Turned out that, not only did the cattleyas require a warmer area than I could give them on my east-facing back yard in Berkeley, but gas heat in the house killed them dead dead dead. Tried the dendrobiums in the back yard, too, under the avocado tree as well as in the house. No go. The phalaenopsis just sort of looked at me and dropped their blooms, never to bloom again.
However, regular and dwarf cymbidiums thrived under the avocado tree, on the concrete patio/slab in Berkeley. I finally divided the mother cymbidium in 1993 and gave plants to NINE co-workers at my then-workplace. That mother cymbidium is still here, and has been divided so many times that I'm certain I've generated two dozen additional cymbidiums from the original plant.
Cymbidiums are much hardier than the other varieties I tried when I started. In fact, they require so little care that I agreed to rescue over a dozen of them October last year from my neighbor across the street. Most of hers were at death's door, but they were free for the hauling across the street, so...
I'm pleased to relate that only three of them were *really dead.* The others have all grown new leaves and I hope to have an orchid plant sale in February or March 2010 from the rescued orchids.
They all live outdoors here in El Cerrito. When we had the hard freeze last December, I moved them under the carport. I just had to make sure they didn't dry out completely, because they were entirely sheltered from any possible rain, cold or otherwise.
I'm just now losing the blooms from the last spike (this year) on the mother plant. I've had cymbidium blooms since maybe February or March.
So give 'em a try. (Heck: come on down early next year and I'll GIVE you one!)
Cynthia H.
Sunset Zone 17, USDA Zone 9