Is this black kale plant bolting?

in Fruit & veg
I planted this black kale plant around September last year and have already harvested a few leaves. Now, as you can see in the photo below, I can see flower buds forming. Is it bolting? If I cut away the top section with the buds, can I prolong the life of this plant? TIA.


Oxford. The City of Dreaming Spires.

And then my heart with pleasure fills,
And dances with the daffodils (roses). Taking a bit of liberty with Wordsworth 
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The curly kale variety which is sharing the same pot has been much more productive though.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
We planted them out (in a netted cage to keep the butterflies off)after the broccoli was over and found that as long as we kept the soil around them weed-free they weren’t too troubled by slugs … so regular hoeing at least twice a week was the answer.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.