[Using my best Jerry Seinfeld voice] A song about gathering herbs? What is up with that?
In the spring of the year, the Celtic folks in days of old would go out and scour the lands looking for flowers, herbs, and leafs that held certain magical properties. They would then take these items to a special place where they would fashion them into a pile or stuff them into a mattress, upon which they would, (how would I say this delicately?) ahem, perform fertility rituals of a most practical nature (wink).