One I know to be wrong for sure: "Oak trees do not produce acorns until they
are fifty years of age or older."

We have lived in our present home 26 years.  Shortly after moving in I
bought a number of small oak trees.  That is, small enough to be growing in
1 gallon containers and portable in my Dodge Omni.   All have been bearing
acorns for 5-10 years.  These trees are now over 1 foot in diameter and
30-40 feet tall.

More uban myths?

John+