If there are any obstacles in the lane she occupies, as well as adjacent lanes, she will immediately stop attacking zombies to attack any obstacles there until all obstacles are cleared from those lanes. She will do extra Shatter damage to obstacles as well.
Her ability of prioritizing and destroying zombie obstacles comes from her ability to destroy any gravestones in both her lane and any surrounding lanes, as gravestones make a reappearance as an obstacle.
Note: The stats shown below only apply to level 1.
Plant Food effect
Blockbuster's Plant Food ability is named Shatter Storm. When used, Blockbuster will deal an immense amount of damage to all obstacles on the lawn, but will not target or attack any zombies.
Blockbuster's Tacobility is Twin Vines, which allows Blockbuster to attack with two vines at once, hitting the two closest targets.
Blockbuster is remarkably poor at being a plant used primarily to attack zombies, due to her low damage output when compared to other attacking plants like Peashooter and Cabbage-Pult, and as such should not be considered as a purely offensive plant.
Where Blockbuster shines however, is her ability to deal an immense amount of damage to all Obstacles in her lane, making her a very excellent plant to choose when facing off against particularly annoying obstacle zombies such as Donut Roller, Firewall Zombie, and Gravedigger, as she can severely weaken their associated obstacles and allow your other offensive plants to quickly destroy them with relative ease.