I do it slightly differently. I sow the seeds in a container. Put the container into a plastic food storage bag. Put the bag into the refrigerator for the recommended amount of time. Usually the seeds will begin to germinate in the refrigerator. You need to check them frequently and move the container to a warmer, brighter area to allow the seedlings to develop.
In general, temperate climate perennials require stratification. There are some that don't but if you are unsure, stratification won't hurt temperate climate plants. Tropical plants are a different story.