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David L. Ryan/Globe Staff
Courtney Hennessey, co-founder of the Higher Ground Farm atop the Boston Design Center, tended to tomato plants.
Hennessey and co-founder John Stoddard (pictured) are using 1,400 milk crates as planters.
The urban farmers are sprouting tomatoes, basil, and arugula.
Essdras M. Suarez/Globe Staff
In April, before 25 tons of dirt were hauled in, the roof stood empty.
A view of Boston from Higher Ground Farm in April. At full build-out, the farm will span 55,000 square feet.
Hennessey posed on the empty roof in late April.
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