i think that's Stokesia laevis
I'm surprised at a nursery that can't ID its plants without a label
the leaves match the flowers Ladybird and it is invasive if it's happy.
Not many safe sides to weedkillers lissermern
the ones that come up on the compost heap are always best
let the birds get at them,
sounds like a spud to me
If you google potato and look at images you'll probably find one just like yours
Alliums grow easily from seed but the fancy named cultivars will not seed true. Sow them now (or just let them seed). It takes from 2-5 years from seed to flower, the small ones are quick, the larger ones take longer
Good idea Bs. I used to make a choc and cornflake thing for the kids many years ago. They had their own special name for it, M....... Delight, after the local sewage works. I hope that helps
You need to get a ladder up there, get it out and repair the damage to the building. Spraying (which I guess is what you're talking about) will leave a dead or half dead shrub sticking out of the brickwork.