The ferns stabilize the soil... the ivy is simply a problem for future Gardeners...
As is the periwinkle.
Suggest researching the invasiveness of both.
I don't have time this morning to suggest links, but both ivy and vinca are huge problems and very difficult to eradicate.
Now... Those ferns are supposed to grow large and lush!
Many of us would simply drool if you posted pictures from last summer when the ferns were at the height of gorgeousness!
The leaves to the right of the tree?
Daylilies? Spiderwort?
