Graham's barrister accepts the crime is seriouspublished at 13:04 British Summer Time 15 July
Christopher Knox, the barrister for Daniel Graham, says he accepts the seriousness of the crime as set out by the prosecution.
He agrees there is dispute over the value of the tree, with defence experts saying it is closer to £150,000, but ultimately this doesn't matter for sentencing purposes.
Mr Knox is citing other high-level criminal damage cases, including an attempt to harm the "totemic" Van Gogh Sunflowers at a gallery. In that case two young women were jailed for 21 and 24 months, which the Court of Appeal then approved as "proper sentences".