Did my 'chokes make it?

I planted my artichokes last year, they grew to about 2' across and looked like thistles.
I cut them back to about 8" in height and mulched them thickly (~8") with hay, over which I laid a piece of black mesh...I figured this would allow the accumulation of a little extra heat on those sunny but cold winter days.
The weather here has warmed a bit, so I pulled back the mesh and the hay...
...to discover that it looks like the plants have withered down to ground level.
There is still a 3/4" round "stump" at ground level, but all the leaves are black and they just pulled away with the mulch.
Are they goners, or do they have a chance?
Thanks, Mark
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I understand that they wont make it in cold climates. You don't say where you are, but I am in Kansas, and planted mine as an annual. I get them once and then I have to replant for the next year.
Dwayne

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