a1722 E. Lisle (1757) 299 Strike fresh sap-roots, or buds preparative to the ensuing spring, and which will the next year be the spring-roots.
2009 J. Bruton-Seal & M. Seal 20/1 The other advantage is that you will know where to dig for spring roots, as the [burdock] leaves die back to very little in the winter and the plants can be difficult to find.