In message , Roderick Orr-Ewing
writes

My apologies - another question about ground elder but I have looked
back and can't find the answer to this one in previous postings.
(Although there have been so many I cold have missed it.)

I will be shifting some soil in my garden soon to make a bank. Some of
the soil I will be using has ground elder in it and I was wondering
from what depth the dreaded stuff can still survive and grow.

Hit the stuff with glyphosate a couple of weeks before you start digging
and it probably won't grow back at all. My guess is anything more than a
couple of feet under will not easily grow back. But it depends how much
ground elder root there is in your soil.

The bank will be about 5ft high with a base of about 8ft so stuff in
the middle at the bottom will be 3 to 4ft from a surface. I would be
sorry if in a few years/months time I discovered that it had crawled
back out to haunt me again!

Thistles do that...

Regards,
--
Martin Brown