Seven local arts organizations are displaying their own uniquely decorated Christmas trees as part of the holiday celebration at Longwood Gardens. The trees, located in the East Conservatory, have been designed by Centered Clay Studios in Kennett Square; the Chester County Arts Association in West Chester; the Chrysalis Arts Center for Emerging Artists in Downingtown; the Community Arts Center in Wallingford; the Darlington Arts Center in Garnet Valley; Historic Yellow Springs in Chester Springs; and the Center for Creative Arts in Yorklyn, Del.