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This is the way to kill a stump(short of calling someone like me in to grind it out). We use them commercially in all instances where we can’t get a grinder in to plough it out(or in the case of poplar or Tree of heaven where grinding often induces even more shoots to pop up from the lateral roots).
We used to use sbk and a few other choice chemicals applied to the cambium layer after cutting a groove round the top of the stump. They all do the trick but ecoplugs mean no risk of drift/killing everything in the garden inc cats, dogs and other furry creatures...In some cases(willow, hazel and other species that will survive being felled) may need a second treatment but if you follow the instructions you should be golden. If you have any prominent buttress or surface roots it’s worth chucking a few there as well.
My go-to is 2” spacing which is overkill in most cases but results in far fewer callbacks from clients.
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edmundro
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I bought some of these for about 60 quid from ebay and followed the instructions.
I used 50 of them in the Sweet Chestnut stump and once I'd found that they'd worked I sold the remainder on ebay for 50 quid! A win all round.