Hi Juliet,
Welcome to Orchid Board
This is probably not the best place to ask this question as this is part of an intro thread that's
really old so is less likely to get seen.
It sounds like you are asking about mounting orchids so I've made a copy of your question in the section on mounting orchids. Here is a link to the new thread I made for your question.
http://www.orchidboard.com/community...a-odorata.html
Also take a look at some of the discussions in the 'Growing on Mounts' section because you may find useful help there. Here's a link.
Growing on Mounts - Orchid Board - Most Complete Orchid Forum on the web !
Finally, just in case you need it, here is a link to info on how to create new posts and navigate the forum.
http://www.orchidboard.com/community...u-started.html
It may also be worth you creating your own thread in this welcome area so everyone can welcome you properly.
If you have any questions about using the forum don't hesitate to ask. You can send me a PM or Sue (cb977) is also a good person to help.