The original question was about the roots of a shrub - not a tree - surely the roots aren't impossible to remove? Even a 12ft lilac won't have roots that would take too long to dig out.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
Stump removal people are rather expensive but worth it when it's not doable by your self. Recently on my allotment my neighbouring allotmenteer removed it for me. He is 80 with several health problems - I was so fearful that he may have a heart attack in the process. What a true gentleman and a dear friend now.
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The original question was about the roots of a shrub - not a tree - surely the roots aren't impossible to remove? Even a 12ft lilac won't have roots that would take too long to dig out.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
Stump removal people are rather expensive but worth it when it's not doable by your self. Recently on my allotment my neighbouring allotmenteer removed it for me. He is 80 with several health problems - I was so fearful that he may have a heart attack in the process. What a true gentleman and a dear friend now.
Oh sorry thought the OP said tree stump and roots
Well, the heading says tree stump and roots, but the question speaks of cutting down a shrub - it's a bit confusing

Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
I would use a lot of energy and my trusty mattock.
When clearing this garden it was invaluable. Be prepared to dig down along way all around the stump though.
I actually bought a matlock. It did work and then my husband came and used brute force. So the stump is out.
If I leave the roots, will these rot down or will they start to grow again?
Is it best to chop them up, the best I can?
I actually have bought a small butterfly bush to replace it.
Whether the shrub root regrows depends on what the shrub is
I can't see that mentioned anywhere but maybe my speed reading is too fast
In the sticks near Peterborough
Nope - type of shrub not mentioned Nut - maybe it's just one of those indeterminate shrubby tree things
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
I know those Dove
In the sticks near Peterborough
Ah yes, the thingy shrub