Does anyone know where I could find a correct one and the meanings behind it? I recently ran across a page that said most celtic tree calendars were wrong.
There is no such thing, really, if you're talking about actual Celtic systems. The "Celtic Tree Calendar" that New Agers talk about is nothing more than an astrology system invented by Robert Graves in 1952. So, while it's fun to see what your "tree sign" is, it really means nothing.
But, if you really want accurate "tree sign" info, try this: http://www.joellessacredgrove.com/Celtic/tree.html
Probably the closest you'll get without picking up a copy of that worthless piece of trash "The White Goddess".