When Dr. Zomboss comes down to throw an ice ball or fire ball, you can use Freeze Shrooms to freeze him. This allows your various pults time to get some damage on Dr. Zomboss himself. Jalapenos will also cause damage to him when he is down to toss a fire or ice ball. The more damage you can do to Dr. Zomboss, the faster and easier it is to end this level. Save at least one Freeze Shroom and one Jalapeno for whatever he tosses.
Use the following plant formation with the following items.
In the morning:
0 1 2 3 4 6 80 1 2 3 4 6 80 1 2 3 4 6 80 1 2 3 4 6 80 1 2 3 4 6 8At night:
0 2 3 4 9 X 7 7 7 60 2 3 4 9 X 7 7 7 60 2 3 4 9 X 7 7 7 60 2 3 4 9 X 7 7 7 60 2 3 4 9 X 7 7 7 6The final Boss will launch massive fire balls and ice balls at your plants. They will crush everything in their path except for zombies (basically, all plants in that row). To destroy the ice ball, use a Chili Pepper in that row. To destroy the fire ball, use an Ice Shroom, but also with a Coffee Bean or else it will fall asleep.
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 Type mustache during a level after you finish selecting your plants.