Carol Klein gave the advice on This Morning. She appeared on the program alongside Ruth and Eamonn, who appeared to have a passion for the vegetable.
The process is called “chitting”. Carol said: “All the little eyes will become new shoots.”
She explained: “A big shoot will come out under the soil where you’ve planted it, and then along the length with be lots and lots of potatoes.
“Then they’ll grow and grow and you’ll dig them up and you’ll eat them.
“I’m going to put it up here in a nice light bright place, you can do it on your kitchen windowsill.”
Ruth asked whether the garden was “in a state” when they bought the property.
Carol replied: “There wasn’t a garden! There were lots and lots of old cars, an old shed – and I had to get in there.
How can gardeners plant sweet peas?
Sweet peas are a flowering plant native to Sicily, southern Italy and the Aegean Islands.