Since this level is a Locked and Loaded Brain Buster, the plants you must use are already picked for you. Also, eight Sunflowers and one Split Pea are also pre-planted on the lawn, they are just frozen solid.
Begin the level by planting a Hot Potato on one of the Sunflowers. Save sun early for the Pepper-pults. When a Cave Zombie comes, plant a Hot Potato on the Split Pea and let the sliders direct the Cave Zombie behind it.
When you have enough sun for a Pepper-pult, plant it in the second column, second row. This will thaw out the surrounding Sunflowers. Save the sun for another Pepper-pult.
Plant the second Pepper-pult in the second column, fourth row to thaw out the Sunflowers. Use Hurrikale to stall the zombies while you get more sun.
Plant another Pepper-pult in the first column, third row (take advantage of the sliders). If you can, try placing two in the fourth column, first row and fourth column, fifth row.
Continue to brave the zombie assault, using Hurrikale. Plant a Chard Guard in the fourth column, third row to throw back sliding zombies.
The Bloomerangs go on the following tiles for maximum damage:
Fifth column, first lane
Third column, second lane
Third column, third lane
Third column, fourth lane
Fifth column, fifth lane
Once this defense is set up, the zombie attack should not be much of a problem. Just watch out for Dodo Rider Zombies and Blockhead Zombies. Note how the usage of the Split Pea is not required in this setup.