Yes you can deadhead, (though I never bother) and don't be rushing out for stumpkiller (or weedkiller of any kind) - it's a young lilac - not bamboo or JKW or a triffid!
Decided to go for the nuclear option. The problem is the intruder seems to have already formed a wide and hard root. It’s also adjacent to the hypericum roots, so don’t want to damage those.
Pretty sure the STJW was there first. Think I would have noticed and commented on the tall stem earlier. (The bushes there when we moved on 25 years ago)
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