In article ,
Ophelia wrote:

How would that area cope if Vinca did spread there?
Could it kill the trees? If yes, or even if not, can you suggest something
else to sow into the border that will not take much care and be safer?

No. It is shallow-rooted and not particularly difficult to remove
except when it gets into the middle of shrubs and herbaceous plants.
If you let it establish under the trees, it might take all the
water from the surface if there isn't a lot of rain. But it's not
a problem to any established tree or woody plant. Mine is ground
cover under climbers, and I merely have to remove it when it
crosses a 2' path and gets into the adjacent bed. Not a big deal,
but action is needed several times a year, including cutting back
its runners (which is easy) when they get going.

However, it can be that invasive! V. minor is less vigorous.


Regards,
Nick Maclaren.