I've taken a vigorous alder out my hedge by my lane, and need to prevent it coming back so the holly to fill the gap gets a decent run.
It is too big to dig out easily, so I want to poison it. Any suggestions?
I have copper sulphate available and apart from that probably only a couple of root weedkillers (ie glyohosate) which will be no good for this.
Will drilling a hole or two and packing with copper sulphate do the job?
Thanks
F