Chitting spuds: newbie questions

I have been chitting some spuds in the kitchen during March.
Most of them have a cluster of 1/8 inch to 1/4 inch stubby green roots
now sprouting from one end.

Some questions:

* Should I prune the green down to a single green root?
* What size should the roots grow to before planting up outside?


Thanks,
Bruce

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