Board Thread:Plants vs. Zombies Wiki Discussion/@comment-6593079-20130222073026/@comment-4647769-20130329190414

Take a look at Draco89123's guide. Trust me, it's easily the best resource available for Survival Endless.

Another tip is to watch some videos of people playing similar strategies to get used to their timing. For instance, TheHardinero has a Warhead setup which has nearly identical timing to builds with 8 or 10 Cob Cannons. (Though if you have 8 Cobs, you'll need a few other explosives to substitute for the other two.  I suggest Cherry Bomb, Jalapeno, Squash, and Ice-shroom.)