In the last few months advice had been sought from experts on what could be done to rectify the situation, he said.
"The consensus was to install galvanised mesh which would be a major help by giving the roses something to cling to.
"We are really optimistic this will work but there is always the possibility we will need to look at a different variety of rose, or other climbers, to get the best effect," Mr Caffell said.
The rose arbour had a rocky introduction to the park from the outset as in August 2006 the then-mayor Bob Francis confessed the newly built arbour with its accompanying plantings was not what had been expected.
A breakdown in communication between the council and landscaping consulting firm Boffa Miskell had resulted in the structure being built with girders too close together and sporting bright galvanised steel instead of a shade of green.
His comments, made at a policy and finance committee meeting, were responded to by Councillor Jane Terpstra, who headed the park development committee.
Mrs Terpstra said criticism was premature.
"It's like saying you don't like the walls of the house before they are properly up.
"The roses, which we have chosen to grow over the arbour, are aggressive growers and will cover the structure quickly.
"It's not about instant gratification. I promise you it will look beautiful. Just you wait and see," she said.