Hi,
Nice tree. It could have used a bit more fertilizer as I see some shades on the leaves/veins and those mean lack of nutrients. Could be the light in the video though .
For artichokes, they use a lot of manure,compost and fertilizer. Normally they'll send root-shoots that you can move to a new spot to spread them in the garden.
Some strains of artichokes can be kept in zone7 with straw protections and hoping for a light winter.
Last winter, killed them all here in the gardens around mine, both the ones for eating and the decorative ones (smaller flowers) .
The decorative ones are hardier.
Their bloom is really magnificent.