Roy Bailey wrote:
I have a large number of plum suckers growing up around the sites of old
trees that have been felled, and also many sycamore saplings too big to
dig out - all of which I wish to permanently remove.

Some years ago I was able to get a crystalline product which was spread
onto the stump immediately after cutting and which effectively killed
the whole thing, but this does not appear to be available any more.

Does anyone have any recommendations as to a suitable replacement? It
doesn't have to be organic, but the less toxic the better.

Roy.
Are the stumps of the plums still there? If so cut into them then pour
brush killer into it. The moral of the sycamore is not to allow them to
grow so big, they are woods weeds. It has taken me several years of
work, cutting off all growth manually to get rid of a similar problem
here, in my defence they were here when I purchased the property.