Sue, if that driftwood has been outside in the weather/rain for several months, it is fine to use as is. All my mounted plants, I have about 75 of them, get watered by Mother Nature when they are outside (and supplemental watering from a hose when necessary). When inside in the greenhouses, the hose does the job. For those in the OPP, I fill a large sink with tepid, highly diluted fertilizer-water, and soak them all (upside down) for 5-10 minutes every week or two, depending on the sunlight that room gets.
I don't know about the Bulbosa.
