The 'parklet' sits outside the farm shop of Daylesford Organic, a Grosvenor tenant. It is designed by Belgravia-based architects Map Projects.
It will be maintained by the shop and includes seating for passers-by. The companies hope it will become a popular meeting place, inspiring people to grow their own gardens and learn about food provenance.
It is Belgravia's second parklet, following an installation by Grosvenor in nearby Ebury Street last year as part of efforts to create a greener estate, contributing to a sustainable ecosystem and making the area more attractive for retailers and customers.
Grosvenor recently joined the Wild West End initiative, bringing together major landowners to create a constellation of green spaces across the West End.
The company's placemaking director Will Bax said: "Green space and well-designed public areas are integral to making places more attractive to visit, work and live. This new parklet will enhance Pimlico Road's reputation as a great place and we are very pleased to be working alongside our tenant Daylesford, involving the local community in growing fresh food."
Daylesford founder Carole Bamford said: "Knowing the provenance of food is hugely important to us. We hope our community in Pimlico enjoys connecting with this food growing demonstration, as a small corner of Daylesford market garden comes to the centre of London."
The two companies will host a launch party for the parklet on 1 October from 4- 6pm, where guests can press apples, have a go at planting and enjoy refreshments. Locals and schoolchildren will be invited to make plantings, which include seasonal fruit and vegetables from Daylesford Organic's market garden in Gloucestershire.