Amber Tree

Amber Tree is a plant that seals zombies in amber.

Effect
Amber Tree acts as a weaker Wall-Nut, absorbing more health than a normal plant and not attacking. However, everytime a bite is taken out of an Amber Tree, there is a 1% chance the zombie biting Amber Tree becomes sealed in amber, freezing it in the spot. The zombie then acts as a defensive plant. The effect lasts for 15 seconds. Boss zombies or vehicles cannot be sealed in amber. Bigger zombies (EG Gargantuar) sealed in amber cannot be vaulted over.

Almanac Entry
It's funny how Amber Tree is male, yet Amber is a girl's name. At least he's not called Annabelle Tree...

Strategy
When using weak plants, Amber Tree is a great way to build up more defenses.