On strawberryplants.org, they recommend that roots be buried more and more every year.
"Strawberry plants produce roots higher up on the crown year after year. In order to maximize primary root production, soil should be added around the crowns of the strawberry plants each year after the primary harvest has been completed (during renovation). Up to an inch of soil should be added to a strawberry bed and around the crowns of the strawberry plants to facilitate this new primary root growth. Be careful to not bury the crowns completely, however. Doing so will likely cause plant damage or death or allow an avenue for pathogenic infection."
I had never heard of this until now but it makes sense and matches what i see on my strawberries where the crown seems to become more exposed year by year.
Does everyone else do this? Thoughts?