How to keep orchids in pots

[Paul Mc]

This is probably a really silly question.

I just repotted all of my orchids late this winter and many have not fully taken ahold yet. They are very loose in the medium. I want to take them outside once the weather is nice enough, but don't want the wind to blow away the lighter weight medium nor toss the orchids out of their pots.

One prime example, my tolumnia's. They are very small, in no medium to speak of other than small bits of charcoal.