Perennial members must not be sited in ground that is annually turned or rotated.
Well established · fatal if ignored → block
How it works
Tillage destroys the crown. Rotation moves the annuals; the perennial cannot move.
What to do about it
Split perennial members into a permanent border; rotate the annuals around it.
The evidence
Evidence: settled without a trial - mechanics.
Cite this page
Milpa Gardens. "Perennial members must not be sited in ground that is annually turned or rotated." Evidence grade: Well established. https://milpa.garden/rules/perennial-members-not-be-sited-ground-that/
A garden-planning corpus: every claim states its evidence grade and links its sources on the page. Cite it with the grade, and add the date you read it.