Bob Hobden wrote:
There are so many Dendrobiums and they come from all sorts of temperature
zones and climates.
From what you say it sounds like a tropical one, has a short flower spike
which grows up at the end of the cane?

Yes. Purpley-white flowers on a thin stem from the end of the cane.

http://www.tohgarden.com/orchid-care/dendrobium/

although I would change the watering to weekly or two weekly unless it's in
a tropical temperature heated room.

I don't think any of my orchids have a problem with my slightly random
watering system, other than when they get accidentally lost and left
unwatered for rather a long time.

However, it's a very useful link, thank you. Had never thought of
charcoal as a growing medium.