How much light does a 'full shade' plant need?

How much light does a 'full shade' plant need?

Tracy DiSabato-Aust (Garden Designer and Author) gives expert video advice on: How do I determine my garden's level of sun or shade?; How much light does a 'full sun' plant need?; How much light does a 'partial sun' or 'partial shade' plant need? and more...

A full shade plant would really have no direct sunlight. So less than even an hour of sun a day and it is often dappled shade or would be under a high canopy of trees.