Interesting thoughts there, must agree with the invasive ones, lemon balm, loosstrife etc but campanula I love, wish it would grow in my nooks and crannies 🙄 but I don't thi k it likes my slightly acidic clay.
I have not had any plant I personally planted but I have inherited Campanula (I think that is how you spell it) from the person who owned my home before me. It is everywhere. I think that I have a section clear of it and more comes through. It is everywhere. It seems to sprout from little nooks that I can't quite get into too.
I bought lots of odd things in the first year in my garden - Bowles mauve, gazinia, aconite, geum. I was basically experimenting and finding out what I like.
Berginia, bought to fill a gap. It went really brown and crispy in the middle. Dug it up and replaced it with more for some reason. Wanted ground cover around my phormium.
Heuchera. I still love the sight of them, but their habit of becoming woody and needing re-planting and molly-coddling was a sore disappointment. I have one left that seems to be able to carry on by itself.
Echinops. A handful of admittedly lovely blue spikey flowers, but on top of 5ft of unattractive ragged foliage which looks tattier and tattier, day by day.
You forgot to mention, also covered in mildew!
"What is hateful to you, do not do to your neighbour".
I bought loads of pure blue Salvia 'Blue Note.' It looks really scruffy to be honest and doesn't flower densely enough to make much of an impact. I already had a mauvey blue salvia called 'Lavender Dilly Dilly' (cringe) which was much better and I should have just propagated it. I also realised I don't like pure blue flowers much. But only after I bought a bunch of Agapanthus 'Navy Blue'. I prefer mauves and purples, they seem to work better with other colours.
"What is hateful to you, do not do to your neighbour".
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Wouldn't it be easier to come to love it?
Cow Parsley, taken over my garden.
Spider web fatsia, looks sickly.
Berginia, bought to fill a gap. It went really brown and crispy in the middle. Dug it up and replaced it with more for some reason. Wanted ground cover around my phormium.