This grows in profusion at Turn Hill. It has a scent a bit like apricots, and it's said that if you place it under your pillow you'll sleep til it's removed!
'If it be leyd under mann's heed,
He shal sleepyn as he were deed;
He shal never drede ne wakyn
Till fro under his heed it be takyn.'
It's also supposed to protect you from witchcraft!