User blog comment:FarmerBob12/My Survival: Roof (Hard) strategy/@comment-76.18.85.88-20101220173742

I tested an alternate build order that worked even better. Built 3 rows of sun at the start, kernel-pults in row 4, and winter-melons at the front row 6. Just two rows of attack plants are enough to fend off rounds 1 and 2. The faster sun production allowed me to build all 4 rows of melons by the end of round 3.