Keep the roots plump and hydrated in the cooler drier air

They've been cold mornings for the past week or two-- low 50's. There hasn't been a pressing need to water the containers, though I've watched for wilting leaves. Keeping the vandas et al sprayed daily of course a must, put a few drops of SuperThrive in the sprayer, maybe pump up the roots to withstand the cooler, drier air.