A former USDA agronomist is sowing diverse rows as director of UDC’s research farm.

Back-to-back warm spells and cold snaps are putting apricot trees through their paces in southern Pennsylvania.

Katie Rehwaldt hoped that 50 people would show up. Instead, 150 appeared. “We ended up having to take over the whole second floor,” she said. That was 1O years ago at the Josephine Butler Parks Center in Columbia Heights, the inaugural site of Rooting DC. Since then, attendance has climbed steadily for the assembly of…