How to chit seed potatoes
21.08.2023 - 11:58
/ theunconventionalgardener.com
/ Emma Doughty
Have you noticed that potatoes left in the fridge, or in the bottom of a sack, tend to grow long white sprouts after a while? Discarded tubers can do the same in the compost heap, and it’s the way that seed potatoes start to grow when they’re planted out in the garden. Those long, white shoots are fragile and easily broken, and they can carry on growing to gargantuan proportions.
Seed potatoes are sold in garden centres and mail order catalogues weeks and even months in advance of a suitable planting date – they can’t go in the ground too soon, or any new growth will be killed by frost. If you buy your seed potatoes early (and it pays to, if you want a specific variety, as they can sell out quickly) then you’ll have to store them until planting time. If you do it properly then you can encourage the potatoes to grow short, green sprouts that give them a head start once they’re planted out.
The difference between snaking white shoots and sturdy green sprouts is simple – light. ‘Chitting’ is the process of encouraging these green sprouts, and simply involves putting your seed potatoes somewhere light and cool until you want to plant them. A windowsill in an unheated room is usually ideal. Standing tubers in egg boxes keeps them all upright and separate and helps to stop any rotting (and to stop the rot from spreading if one of your tubers is duff).
Sprouts appear from ‘eyes’ in the potato, and most will appear from one end – which is the ‘top’. When you plant them, plant them with the top upwards. If you’re short on seed potatoes then you can cut them up at planting time, making sure that each cut section has at least one sprout (or eye, if they aren’t sprouting), although I have never tried it.
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