"Écolibrium" (Image/Liz Pacheco)As you might have already heard, the corner of 20th and Market has been transformed. About a month ago the space was a fenced-in vacancy, covered in weeds and trash, a more than 20-year-old eyesore in Philadelphia’s business district. But now, amidst the skyscrapers of Center City, stands what Pennsylvania Horticultural Society (PHS)
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