Ann Higgins is the Chairman of Eston Residents' Association, which maintains the town's flower displays. Their work has been the subject of vandalism five times in five weeks.
The most recent came just two weeks before the judging of Northumbria in Bloom, which the group have previously won.
"I don't know why it's happening. I don't know what pleasure they get out of it, or whether it is just society today. But we won't give up.
"We will keep on doing it, because first of all we do it for the people and the community. The competition is the icing on the cake."
More top news
Sunderland are just three points behind sixteenth placed Middlesbrough despite a 4-0 home defeat to Southampton in their last league outing.
Macmillan Cancer Support’s mobile service will be visiting the region, with cancer information specialists on hand to answer questions.
Enquiries are ongoing and police are appealing for information after the incident.