Board Thread:Fun and games/@comment-25300287-20161120054843

To do this, you upgrade a plant. Only one upgrade at a time. There is a max of 5 upgrades before another plant is mentioned.

Example of valid upgrade:

Peashooter shoots peas twice as fast.

Example of invalid upgrade:

Peashooter shoots twice as fast. Sometimes, it deals double damage.

Previous thread:

http://plantsvszombies.wikia.com/wiki/Thread:767505 