In article ,
Kay Easton wrote:

The two patches of woodruff I know about are a) under a weeping crab
apple on the N side of our house b) on our local nature park, steep bank
planted densely with elderberry and hawthorn.

So I think woodruff can cope with deep shade!

It is a woodland plant, after all. My guess is that it can compete
with Vinca major only when the latter is severely handicapped - e.g.
by deep shade! Certainly, here it can't.


Regards,
Nick Maclaren.