Nice posting there Eric.
Makes you wonder if we gardeners are working with or against nature, does it not?
As for weedless gardens - now, that would be paradise
I now realise I have an annual cycle "working with nature".
Currently its dandylions and I'm almost paranoid about them. I spend hours at this time of year removing those cheery blooms.
If they are in the "fallow" areas, I deadhead them. If they are accessible, I use a long handled pointed trowel, filed to a sharp edge at the point, which I use to cut the weed just below the surface, taking up the entire growth.
I never mow the lawn when until they are removed.
It leaves the tap root of course, but it gives no more bother until its second flush later in the year (aren't they so prolific!) Mind you the third flush, the sporadic ones which do their business during off season can catch me out!
They are truly amazing. The stem carrying the bloom or a flower bud has the knack of dropping off the plant as you put in in the weed bucket. If you don't see it, even an undeveloped flower will continue to flower and set seed - truly indestructible and programmed for survival.
For that reason, whacking with a strimmer isn't an option!
Nettles are next in order of nuisance. Don't allow them to go to seed! They develop a very tough root structure, don't they!
Buttercups are OK if you get them in time. If you don't, boy they don't half get a grip of the earth! If beside a timid plant, well its in trouble.
Now heres the ironic bit. My first task each spring is to go out and weed around my precious plants. Invariably, they are smothered with forget-me-not, grass in variety etc etc. I weed cautiously until I find my plant. Eventually (if lucky) I discover this timid little plant just awakening from its slumbers! Usually, its eaten to the ground by slugs (another posting Eric?)
Sometimes theres nothing! You end up with a bare patch and in a few weeks (again if lucky) the sleeping beauty emerges.
I chuckle each year as I rescue Nepeta 'Six Hills Giant' - how misnamed can a plant possibly be!!!!
I have to agree with your choice of three serious weeds.
Most can be introduced to the garden very easily.
I spotted this beautiful Helleborus niger in full bloom at a garden centre.
Then, I also spotted a strongly growing bindweed in the same pot. I pointed it out to the owner. He pulled the weed and went about his business. I left empty handed. Pity the poor customer who bought that plant
Divisions are lethal. Thats how my dad introduced ground elder to one part of the garden, with a very beautiful Phlox. Both are growing strongly and thats after 25 years.
A new gardener should be warned about the dangers of buying a load of topsoil.
I came very close to buying a lorry load of what I thought was quality soil, piled at the site of a new Sainsburys and B&Q outlest close to my home.
They spread some over a disused road. Now its full of Gorse -we call them Whin bushes (do you call them whin bushes?)
I didn't need that weed. The soil was obviously full of gorse seed (plentiful in that area)
When they widened the road outside my house, they took away a strip of my garden and in compensation, built me a nice brick wall. They brough a load of topsoil and filled it in to the new wall. Now I have bindweed!
Hey, isn't gardening so much fun