Silanah - yes ----- you can.
But make sure to read important details below first.
I recommend putting the orchid in an area that has some air-movement ----- a growing area that doesn't have still-air. And maintain recommended growing temperature range for the orchid.
And you can gently spray a little bit of water into the media ....... but don't over-do it. Just enough to make the media lightly damp. Lightly damp. You don't even have to get every bit of the media in the pot damp. Just some moisture in the pot can at least allow some roots to absorb that moisture.
And you can thread this post too :
Click Here.
Alternatively, you could even use a water spray nozzle to spray water into the regions toward the outer edge of the pot. This allows some water to get down into the media toward the sides, which can help keep the moisture/humidity up in the pot (for the roots). If necessary, you can
remove some of that surface spaghnum
near the rim (of the pot), in order to direct water spray into the media around the edge (rim) of the pot.
Also - as long as the temperature is not super cold, and the spaghnum stays lightly damp only (lightly damp!), some water getting onto the new roots and old roots won't harm the orchid at all. It won't harm the roots or the orchid.
Everyone has their own method. My method has been with this setup
Click Here, which gives me the option to spray lots of water into the regions near the side/rim, and it also allows me to spray some water into the spaghnum region. I control the water in the pot in this way.
Basically - when my catasetum arrives by post, my seller (source of orchid) has the orchid already growing in the firmly packed spaghnum. So when it arrives, I unpot the orchid (leaving the spaghnum mass as-is). Then I add the orchid (keeping the spaghnum mass) to my new larger pot (as shown in my setup).
If 100% spaghnum is used (alone), then that's absolutely fine. Excellent results can be achieved with 100% spaghnum - just need to not over-do things with the watering - as spaghnum becoming too wet will definitely drown the roots.
One extra note is - many professional growers pack the spaghnum relatively firmly, not loose-packed. Relatively firmly, but not so firm as to crush/destroy roots.....
VIDEO