Posted: 18/01/2015 at 21:05
I wrote tis a long time ago, but I still think it's relevant:
"Once home, seed tubers are best 'chitted' or sprouted.
Unpack and lay the tubers out in a single layer in a tray with the 'rose' end uppermost.
This end has the most eyes or buds and sprouts will arise from these. Some suppliers offer 'pre-chitted' seed.
Keep the trays of tubers in a cool but frost-free place with at least moderate light, such as in an unheated room.
Direct sunlight is best avoided. Sprouts will form within a few weeks. The tuber is therefore ready to grow away as soon as planted.
Tubers can be laid out to chit from January onwards, but planting should be delayed until March in sheltered and southern areas or April in less favoured districts.
Earlier plantings can rot in the ground or the shoots can be frosted off on sharp nights. By this time the sprouts should be about 5cm (2in) long and dark coloured. Longer thinner sprouts are caused by excess heat or too little light or both, and tiny sprouts suggest conditions are too cold.
Chitting takes about six weeks."