Ladies bedstraw

Lady’s Bedstraw (Galium verum).   

a perennial wildflower It produces a froth of honey-scented flowers that are beneficial to pollinators. 

Also known as yellow bedstraw, or bed flower, it's thought to get its name because its dried flowers were traditionally used for stuffing mattresses. When dried, the flowers smell of hay, and the scent was said to repel fleas. It also has associations with helping women giving birth – it's thought to have a sedative effect.