The trees, one 28ft tall and the other 14ft, which have been supplied by Baytree Nurseries and Garden Centre in Weston near Spalding, will take centre stage in Hall Place and the historic High Bridge.
The gesture is the centre's way of saying "thank you" to the local community for shopping at Baytree over the last four decades. The company has also offered to donate Christmas trees to all market towns in South Holland.
Councillor Howard Johnson, Executive Member for Economic Development, said: "I am delighted that once again Baytree Nurseries have donated Norwegian Spruce Christmas trees to help provide a festive feeling to the town centre which I'm quite sure we all appreciate; on behalf of all of Spalding's residents and the traders I would like to say a very big thank you to Baytree Nurseries for their very kind donation."
Baytree Nurseries boss, Reinhard Biehler said: "This is a thank you to our loyal customers and a way of showing our support to the local community through these difficult economic times."
The trees, which have been grown at the nursery's plantation at Moulton Seas End, will be installed this Friday (25th November).