The Scots star was at Dobbies Garden Centre at Braehead to press the masterswitch on the lights of all the 12-foot Christmas trees in Dobbies' 32 stores across the UK, on which customers can hang their festive wishes.
Each customer makes a £1 donation for a bauble to write their wish on and then hang on the tree, and all this year's donations will go to children's cancer charity CLIC Sargent.
Carol also unveiled a "barrow full of wishes" which were prepped and ready to hang on the tree.
The garden company hope to raise £50,000 for the children's cancer charity. Every year their wishing trees attract thousands of customers to make a wish on anything, from a new car for Christmas to having their mum home safe for the festive period.
James Barnes, chief executive for Dobbies Garden Centres said, "CLIC Sargent is a fantastic charity to be working with and will touch the hearts of our customers, many of whom are parents and grandparents themselves."