thirded for paving
If they were mine I'd cut back to about half the height of the fence. and just back a bud or two if there's enough sideways growth to encourage bushiness
It has quite a relaxed style but anything will go up a wall if you tie it in. It won't go very far up though. They may get a bit taller but I've never seen one much over a metre tall
Unusual plants are unusual for various reasons. One is that they are tricky to germinate/grow on.
I think the combination of 'unusual' and 'chuck and grow' will be difficult to find in a packet of seeds.
No bells ringing here.
Mowing certainly does for them.
It's an old thread Hosta, you've probably been paid already
Seeding is the invasive bit GD. It gets huge but it doesn't spread by runners.