Posted: 29/05/2012 at 08:35
Or it could be dead - container grown evergreen trees are very difficult to overwinter succesfully. If their root balls freeze for an extended period the roots die, but this only becomes apparent when they try to grow in the following spring and realise they don't have the roots to support their leaves, which all brown and drop.
If you purchased the tree this year, this is possible. Especially with Q. ilex, most of which originate in Holland or Italy, both of whom have just had severe winters.
but Alina's advice is sound - water and wait!