Stepney City Farm has won £191,000 to help fund it for the next four years.
The money will be used to pay its chief executive as it regains access to 1.5 acres of space. For the past eight years Crossrail occupied the land.
The City Bridge Trust, a charitable arm of the City of London, donated the money.
Clare Hawkins is chief executive of Stepney City Farm.
She said: "This will be an exciting and busy juncture in our history, as staff and volunteers work to expand our food growing programme and educational and wellbeing initiatives, instate new infrastructure, fundraise for a new visitor information centre, and plan for our long-term sustainability."
The goal is to ensure continuity, development of activities and maintaining a sustainable business model, she added.
Stepney City Farm is a three-acre working farm that offers free environmental education and outdoor learning in Tower Hamlets.
Around 5,000 school children visit the farm every year for the activities.
It also sees special needs children and young offenders volunteer their time.
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