Nearly £24,000 is to be spent replacing plastic plant holders with hardwood versions around Aylesbury.
The town council has authorised use of reserves money to fund the project, which will see 67 planters at roundabouts and intersections near the town centre replaced.
Lid Dem councillor Stuart Jarvis, who proposed the £23,700 change, said the new versions will be more attractive and last longer.
However, some councillors said it was a waste of money.
Councillor Jenny Bloom, Conservative, said: “I think the planters look fine as they are.
“It is a lot of money in this economic climate.”
The current planters will be replaced in time for the Britain in Bloom competition, with some relocated.