The bed in Roath Park has a wire-framed lighthouse, a clock face, a Union Jack and a carpet of 3,300 bedding flowers including blue petunias, depicting the sea.
Cardiff Council grounds maintenance manager Dave Hopkins said: "The clock displays 7:12, which in 24-hour-clock terms is 19:12, the year Scott reached the Pole."
Scott weighed anchor from Cardiff harbour in the Terra Nova ship in 1910. White petunias represent the icecap on which he staked his claim on the South Pole.
Contributions for the floral design came from the local Harbour Authority and the Captain Scott Society. Society member Julian Salisbury said: "Scott was from Devon but he found the people of Cardiff generous in their sponsorship. Scott had said the Terra Nova would return to Cardiff with or without him, and it did. But sadly Scott and his crew did not make the journey home in 1913."