Magickal Form: Acorn, bark, branches, trees
The Oak is connected with spells for protection and strength, fertility, money and success, and good fortune. Carry an acorn in your pocket when you go to an interview or business meeting; it will be bring you good luck. If you catch a falling Oak leaf before it hits the ground, you'll stay healthy the following year.
Sacred to the Druids, the oak branch makes an ideal witches' wand. Standing under the tree grants protection, strength, and longevity. Acorns were used to ward off lightning and can be carried for fertility and prosperity. Add the bark to incense for strength and grounding.
Dream Divinations: Dreaming of resting under an oak tree means you will have a long life and wealth. Climbing the tree in your dream means a relative will have a hard time of it in the near future. Dreaming of a fallen oak means the loss of love.
Other oak tree lore: If you catch a falling oak leaf you shall have no colds all winter. If someone does get sick, warm the house with an oakwood fire to shoo away the illness. Carry an acorn against illnesses and pains, for immortality and youthfulness. Carrying any piece of the oak draws good luck to you (remember to ask permission and show gratitude.) The Oak trees essence helps boost energy levels and the ability to manifest our goals.
It is tradition for the Litha fire to be oak wood representing the God, since this is the time of year when oak reaches its Zenith power. Witches often danced beneath the Oak Tree for ritual. The druids would not meet for ritual if there was not an Oak tree present. King Arthur's round table was made from a single cross section of a large Oak.
In England the name Gospel Oak is still retained in many counties, relating to the time when Psalms and Gospel truths were uttered beneath their shade. They were notable objects as resting-places in the 'beating of the parish bounds,' a practice supposed to have been derived from the feast to the god Terminus.
The following is a quotation from Withers:
'That every man might keep his own possessions,
Our fathers used, in reverent processions,
With zealous prayers, and with praiseful cheere,
To walk their parish limits once a year;
And well-known marks (which sacrilegious hands
Now cut or breake) so bordered out their lands,
That every one distinctly knew his owne,
And brawles now rife were then unknowne.'
The ceremony was performed by the clergyman and his parishioners going the boundaries of the parish and choosing the most remarkable sites (oak-trees being specially selected) to read passages from the Gospels, and ask blessings for the people. Many of these Gospel trees are still alive five in different parts of England.
'Dearest, bury me
Under that holy oke, or Gospel Tree;
Where, though thou see'st not, thou may'st think upon
Me, when you yearly go'st Procession.'
Another interesting tidbit is that the tree's roots mirror its branches and stretch as far below ground as the branches do above. A great example of "as above so below."
From Encyclopedia of Magickal Ingredients and A Modern Herbal