The Girls Aloud star - who lives in Aylesbury, Buckinghamshire, England, with her DJ boyfriend Tom Crane - is "obsessed" with the earthy hobby and has started growing her own organic produce.
A friend of the singer revealed: "They`ll always love a good party but they love gardening. They talk about it non-stop and post snaps of carrots on Facebook. They`ve even talked about getting chickens or ducks."
The blonde pop beauty recently spoke about her favourite new pastime, revealing her love for gardening came about after she watched a television show about people who grown their own fruit and vegetables.
She said: "I sound like an old granny, but I`ve really got into gardening and I`ve been growing my own veggies. I`ve bought these old barrels and I grow organic fruit and veg in them. Garlic, onions, lettuce, carrots, strawberries, raspberries - the lot.
"I started it after watching a TV show about gardening. I wanted to start eating more organic stuff and I had the space to grow my own, so I thought, `Why not?` But I don`t think you`ll be seeing the SarahHarding Organic Range Of Vegetables any time soon!"