How to kill a sycamore

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There is a patch at the end of the big flower bed, right by a yew tree that you’d think would be pretty dry and infertile. But no, a sycamore seeded itself, as did my bear’s britches. I want the bear’s britches; I don’t want the sycamore. It’s more than a seedling now and is flourishing. I glyphosated it last year during my attempts to kill the alkanet, but it’s made no difference.
How do I get rid?
incidentally the original patch of bear’s britches is now huge. Can I split it and if so when?
incidentally the original patch of bear’s britches is now huge. Can I split it and if so when?
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The sycamore if it's become a tree is more difficult. I cut one, roughed up the cut and painted with sump oil and brushwood killer. This must be done in one go.
It appeared dead for a few years and regenerated. It wasnt in a place I could dig it out.
Perhaps you could do the tree now when the poisin will do it's job best and try getting it out in autumn when you do the bb,s.
Otherwise keep it cut low as an ornimental shrub or Japanese style.
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For the sycamore glycophosate works but keep and eye on it for a few years