Are you going to transplant them next spring?
The grocery store where I bought the tabletop trees has a knowledgable group of workers who buy good healthy stock and they know how to take care of all their live stock so they stay healthy. They said the Richland fir trees wouldn’t last outside in the winter and I should look to repot them eventually and put the pots outside for the spring, summer and fall only. But I’ll check with the local garden store also for their advice.