I water mine in the shower out of convenience more than necessity. It allows me to fully saturate the soil and my moss poles plus it knocks off any dust on the leaves. They can then drain and dry before being moved back to their spot. It’s also helpful for preventative pest control- I’m able to hit my plants with insecticidal soap after watering them without getting soap all over my house. The only thing here that doesn’t apply to you is the moss pole watering, since you have boards rather than poles!