You need to know what type of Dendrobium you have before you can proceed with any confidence. Does it have flowers or has it flowered in the past?

There's far too much variation between the many Dendrobium orchids to be able to give a general 'one-fits-all' solution.

Unfortunately, the person who gave it to me has no idea what it is and it does not have flowers.

Although flowers would help the most, posting a picture of the dendrobium might give some kind of clue as to what section of dendrobium you have.

Well, okay. My orchid is in a small clay pot above the N. ampullaria "green" plant label:

This post was edited by Dragonflyguy on Sat, Mar 23, 13 at 13:12

If you put Dendrobium into the checklist of species kept at Kew you will nearly 2900 names including many synonyms.
Just to give an idea of the variation in types have a look at the flowers pictured in the link.
The genera is found in all sorts of climates from India through to Australia.
Plant form from miniature to giant.
Can you grow them in a terranium? No idea. But this one would at least fit and might be happy in the (wet, monsoon) season but then the dry season arrives in Northern Australia with warm sunny days and very cool nights where it (Hopefully) still grows.
{{gwi:146578}}
All you can do is observe what happens with your orchid. Are there signs of new growth at the base of the canes (pseudobulbs)?
Maybe a better Photo might enable someone to have a guess at the type. Nobile type & Dockrillia types are unlikely.
Arid regions usually have the plus of sunshine.

Here is a link that might be useful: Dendrobium assorted flower pics.

This post was edited by arthurm on Sat, Mar 23, 13 at 15:30

I do not see a dendrobium in your photo. Please try to post a photo so we can see the type.

Most (all) dendrobiums need good air movement which I doubt you can get in a terrarium unless you have a fan running.

They also need to dry out and many have dry seasons. They need strong light.

Your best bet would be to grow it in a sunny windowsill. I wouldn't worry about the humidity. It seems the terrarium would not be a suitable environment for a dendrobium.

Jane

I don't see it in the photo either. I DO see some nice Carnivorous plants though. Nepenthes!

Me too. I just repotted a Nepenthes yesterday. Never grew them before but was given one as a gift. I'm just growing it in a tree, luckily I don't need a terrarium! It would have to be a large case to handle the one I have. Grows like a weed.

Jane

Very nice plant!