Oak
The Oak occupies a single day of the year: the spring equinox. It is the tree of strength and the principal tree of the Celtic tradition. This tree's day: March 21.
Personality
The Oak is credited with willpower, endurance and directness. It does not change its decisions under pressure and handles uncertainty poorly.
Weak spots and compatibility
The weak spot is inflexibility and a habit of pushing through where an agreement could be reached. It gets along well with the Elm and the Cedar, and has a hard time with the Willow and the Poplar.
Love and friendship
In love, the Oak is a pillar of support: it takes on responsibility and protects its own. It finds it hard to give way and admit weakness, so it needs someone beside it who isn't afraid of its directness.
Career and money
At work it is strong where endurance and decisiveness are needed: leadership, heavy projects, hard times. For the Oak, money is a means of security, not of luxury.
Advice
Hear people out before you decide: giving way is sometimes stronger than pressure.