I'm moving into a new house that has a good sized strawberry patch on one of the corners of the lawn. I want to build a large raised bed for it and help it spread out more. If I build the border of the bed, and just gradually fill it in with soil, will strawberries be able to handle that? If so, how quickly can I fill it up and when would be the best time to do this? Is there anything I should avoid?
Also, is there a term for this? "raised bed" seems to only refer to a structure built before plants are planted, which makes sense.