I've just had my laylandii hedge cut down to ground level as it was almost dead. The people who cut it down for me told me to get some root killer from B&Q/garden centre etc.
When I went to the garden centre yesterday they told me that, once a laylandii is cut down, it will die off naturally and I don't need to put anything on the stumps to kill them.
Is this correct? Any advice would be gratefully received.