Why is my artichoke sprouting in September?

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My globe artichoke plants have produced well this Spring and early Summer. In mid summer, two shoots emerged from a plant. I separated the shoots when they were 12" tall and planted them. Both shoots are growing slowly, after the initial shock. Now, in late summer, the same "mother" plant has six new shoots surrounding the 4" trunk. The trunk was cut back when the hot summer heat in Rogue River, yellowed and dried all the leaves. My question: Should I try and separate the new shoots and plant them or do I leave them around the "mother" pant? Is the two year old "mother" plant dead? Will it grow new leaves or are the shoots the new growth for next year. For Winter, I cut back the plants and mulch heavily. I have never had new growth this late in the season. I will be covering the new growth with mulch in October before frost , if I don't separate them first. What should I do? 

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