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
Sunday's Pollen for the North East region
Cladding from high-rise flats in 25 local authority areas has now proved to be potentially flammable in the urgent safety review.
Police have shed further light on the crash, which took place in Newcastle while people were celebrating Eid.