This is an idea for a small business where individuals with gardening knowledge and skills and the required land available plants vegetable gardens on behalf of those who lack those things. I imagine it being a success in cities where many people live in apartments without access to gardens.
Customers would simply sponsor a piece of the garden and pay the farmer a fee, in exchange for this they get the vegetables grown in that garden. They would be able to request the veggies they would like to have grown depending on the season.
For this to be a success, the cost of sponsoring the garden should still work out cheaper than buying vegetables from a store, while also being profitable for the farmer. The produce from the sponsored section of the garden should only need to be enough for one household, so this doesn't need to be an industrial operation, people would be able to pay in accordance with their needs.
In return for sponsoring the seeds, nutrients and poisons, as well as remunerating the farmer for his/her time, clients would receive delicious, fresh vegetables every couple of months.
Anyone with gardening knowledge and land available would be able to make use of this business idea, but I imagine it being especially convenient for retirees or school children looking to make some extra money.
The price should be fair enough that a problem like disease or infestation doesn't cause huge financial losses and gardeners could keep a separate "insurance garden" for their own use and to have stock to give to their clients if something goes wrong with their sections. Alternatively, if one harvest goes wrong, the gardener could simply carry the cost for the next couple of months until their client gets what they paid for.