This document provides a companion planting guide that lists various plant species and indicates which other plants they have beneficial relationships with ("companions") or harmful relationships with ("foes"). It lists the functions that companion plants serve, such as improving growth, flavor, repelling pests, or attracting pollinators. It also includes information on soil regeneration techniques using volcanic rock dust and compost teas. The guide suggests that companion planting can increase food production by 250% or more in a sustainable way.