Can potting mix be used straight out of the bag?
No, potting mix should be rinsed prior to use with the exception of peat mixes such as our terrestrial blend. An old colander works well for this. Rinsing the mix removes any small particles that would rinse out of the pot on the first watering and wets the mix, reducing the shock to the orchid. Pour your blend into a colander, rinse it well and then put it in a clean dish pan. This allows you to scoop it into the pot easily when the time comes. Sphagnum mixes should be rinsed, squeezed out and then fluffed.
