There are nearly 175,000 applications for allotments stuck in waiting lists with people in limbo for around three years on average, according to a Greenpeace investigation.
Some people have had to wait for up to 15 years to be able to grow their own fruit and vegetables, with waiting lists in England doubling in length since 2011, campaigners said.
By sending freedom of information requests to every local authority in England, Scotland and Wales, Greenpeace found a total of 174,183 applications in waiting lists.
The city with the longest list was Bristol, with 7,630 applications, followed by Sunderland, Portsmouth, Southampton, Edinburgh and Manchester.
In many cases, the number of applications waiting exceeded the total number of plots available, with data covering up to September 7 this year.
Greenpeace say this shows people want to grow their own food as a way to improve their health, save costs on shopping and reduce their carbon footprint.
Daniela Montalto, Greenpeace UK forests campaigner, said: “Allotment waiting lists demonstrate a huge desire from people to be part of the solution to our broken food system but without access to land, the many benefits of community food growing to people, nature and the climate are being stifled.
“The Government must support councils to act as well as take seriously its own role in creating systemic and lasting change to the food system.
“Crucial steps include proper support for farmers to transition to climate, people and nature-friendly farming as well as measures to reduce our climate footprint abroad including a ban on imports of soya and other agricultural commodities that drive deforestation in places like Brazil.”
Together with a group of artists, the campaigners created a 30-metre long seed paper banner embedded with seeds and ash from burnt out Amazon rainforest spelling out the message: “We the 174,183 demand allotments.”
Allotments historian and lead artist for the project JC Niala said: “With the acceleration of climate change and the persistence of structural inequality within the UK and globally, food has become both an emblem and an embodiment of the troubles around us.
“Allotments quite literally provide a lifeline for some. They bring good local food back to people and take away the bad taste of the global industrial food system.
“They improve people’s mental health and wellbeing by creating a sense of purpose and increasing opportunities to connect with others as well as spend time in nature.”
The Department for Levelling up, Housing and Communities has been contacted for comment.