In ancient Latvia
, Zalu Diena
("day of grasses") was a festival held on June 20
. The women and girls gathered grasseses
to weave into wreathes. Farmers cut birch
boughs and putting them in their barns; this prevented mice and other rodents from eating the harvest. John's Grass was given to the cows and sand was sifted onto their heads; this caused the cows to have sweet milk. Young girls gave crowns of flowers to their potential suitors; both children then wore their wreathes to bed and, if they dreamed of each other, they were a match.