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