"All garden have accessibility information on their websites and in their brochures," said Bella D'Arcy, who created www.gardensandpeople.co.uk.
"But how accurate is this in practice? We are compiling a list of reports on the accessibility to gardens open to the public for people with disabilities."
D'Arcy said she wanted people with disabilities to draw up detailed reports on the public parks and gardens they visited.
"I would like people with disabilities or their carers to tell me about their experiences when visiting gardens - good, bad or indifferent," said D'Arcy.
"The report will then be put on the website and sent to the garden concerned who can use it to either trumpet their good accessibility or perhaps to change things."
D'Arcy, who uses a stick for small gardens and a mobility scooter for big gardens, sometimes had to ask for a wheelchair is she travelled by train, she said.
She wants people to list their disabilities and describe their visits, with notes on easy areas, inaccessibility issues and whether marketing literature warned them of difficulties.
"The first reports will be uploaded in July and we will go on adding them. But we want to praise as well as criticise."