AvoKABOOM

If you never know this plant, it's from IAmPlayer's "Deep Paradise Woods" custom world blog in regular PvZ Wiki. You can take a look here.

How To Unlock
It's a Gemium Plant in Plants vs. Zombies : The Plants' Rescue. It cost 250 gems for it. But, there might be a new method to unlock it, soon...

Surbuban Almanac Entry
AvocaBOOM

Explodes in a 3x3 area, then drops a seed that explodes in 5x5 area. But arming the seed takes time.

Damage : High (90 NDS)

Sun Cost : 175

Special : Drops a seed that explodes but takes time.

AvocaBOOM had to join the adventure because he had to. He never wanted to go on out for an adventure to rescue Plants that are in danger. But as the Woods Military Commander insist him to join the fight againts the invasion, he must join it. "It's an order, he says," said AvocaBOOM. "Ya know... I prefer playing games by now. So If a huge wave of zombie arrives, call me. I'll be chilling even more."

Strategy
Every since this plant has a first radius of 3x3, then 5x5, it's best to be planted in the 3th lane, the 7th column. Because, when the seed was ready, once the zombie touches it, it will explode in an instant.

Trivia

 * AvocaBOOM is the only explosive plant that were available in Deep Paradise Woods.
 * AvocaBOOM has a special quest called "Explosives Rock!", which challenge the player to beat 10 waves flag of zombies, PvZ1 Survival Style, with AvocaBOOM already chosen and can't be taken out.
 * AvocaBOOM is the Plant that look rather simplistic. Considering it's made less than 15 minutes.