I've just discovered a leftover bag of Second Earlies (Wilja) from last year that weren't eaten. They've gone a bit soft and have grown considerable roots. Can I plant these out? Should I take off where they've sprouted roots and wait for some more, much shorter ones? Can I cut a bigger potato in half and plant both halves? (I'm sure the old guy who had the plot next to me used to say he did that, but he's died now so I can't ask him.)