"Janet Baraclough" wrote
The message
from "Rupert" contains these words:

The invasive bit really is overdone. In ideal conditions some
varieties may run but it does not happen overnight.
I have several so called invasive species planted about 6 years ago
which have clumped up slightly.

But when the spread does start in older clumps, it can be extremely
difficult to control

Just as well this thread has come now. I was making a list of things I
could possibly plant in a relative's garden to screen a boundary wall.
Are there -any- varieties that are reliably non-invasive?

--
Sue