Board Thread:Plants vs. Zombies 2: It's About Time/@comment-25133884-20141112030254/@comment-24275721-20141112043259

ADVENT-UR-TRON wrote: i DONT have any tier 3 plants. but level 2 of pirate seas SoS has seagulls. Then keep feeding Spring Beans Plant Food and keep SnowPea and Repeater for everything else.

That's how I did it back when there was no plant upgrade system. It was hard but satisfactory (but now I have every plant at Level 3).