The Druids consider the oak tree a very sacred tree, therefore the acorns were considered sacred.
Acorns became a sumbol of immortality, strength, and power. The Druids would eat acorns thinking it would give them these great gifts. The acorn was also a great talisman acting as a protector from evil spirits. The ancient men of mysteries as well as the Romans would wear a necklace of acorns around their necks. The Goddess Diana was known to be adorned with these necklaces.
Thor, one time, sat underneath a Oak tree during a great storm to protect himself from the lightning. Oak tree is probably the only tree that is safe from lightning during a storm probably due to it's height. Anyway because of this, people put acorns on their window sills during thunderstorms to protect their home from a lightning strike. In some Nordic tribes, the fruit of the oak was the life giving acorn which was one of the main food sources.
Some people would carried acorns in their pockets to prevent aging. Also carrying an acorn in your pocket some thought would increase fertility, strength, and sexual potency. I still have the acorn that my grandfather brought with him from Ireland. I use to carry it in my pocket a lot. It's much larger than those around here in the south.
If you are down on luck in the money department, try to plant an acorn in the dark of the moon. People in ancient times would do this to ensure receiving money in the near future.
In 17th century Britain, acorn juice was given to alcoholics as a cure or to stop them from taking the next drink. Acorns may be used as a powerful antiseptic.
Native Americans venerated the acorn as well. They would collect enough acorns to store for two years. They would dry the acorns in the sun to prevent mold and germination. Afterwards the woman would take the acorns to their villages and store them in hollow trees or structures on poles, to keep them safe from mice or squirrels. They found a way to remove much of the bitter taste and the tannins, that are contained in the acorn, to make a type of acorn meal for breads and flour. They also used the acorns to predict a hard or mild winter. An abundance of acorns meant a harsh winter.
Mountain folklore claims that if you put an acorn between the mattress and the box springs of a lover's bed would keep him/her faithful.
In Ancient Japan, acorns were harvested, peeled and soaked in natural or artificial ponds for several days to remove the tannins, then made them into acorn cakes.
In Korea, a edible jelly was made from acorns, called Dotorimuk.
Now when hear those little jewels of the oak trees fall and hit a tin roof or when you step on them in your yard, you know a little history of the acorns.
-written by Grannulus