I have had the most life affirming experience of getting a tree surgeon
to cut down a line of leylandii cypresses on the boundary between my
garden and my neighbour's - to the intense satisfaction of all
concerned. I have now planted the "hedge" with a variety of flowering
shrubs, including fuschias, flowering rubus and a couple of roses.
The leylandii stumps have been cut to ground level, except one of which
only the upright trunk remains, which I am using as a climbing pole for
a climber or two.
Do I need to treat the stumps - including the trunk - to kill them and
avoid re-growth? Also, the root network of those nasty creatures is
making it relatively difficult to dig and plant anything there. I
there any type of product that, painted on the cut section of the
remaining stumps, would kill the roots (a little like round up does for
more conventional weeds?).
Thanks for any assistance!

Cat(h)
The world swirls...