Blue poppies now on display at Longwood Gardens. EAST MARLBOROUGH — Once considered a myth, blue-poppies (Meconopsis ‘Lingholm’) are alive and thriving at Longwood Gardens, but only for a limited time. These spectacular flowers—which are native to the high elevations of the Himalayan Mountains—are on display now in Longwood’s Conservatory, one of very few places to see these rare gems. ...