So, if you're anything like me, you like looking at the descriptions of the cards, since they have some cool flavor text. If you're anything like me you'll also have noticed that the lore is more convoluted than Dark Souls and nobody has gotten around to explaining it, so I guess I'm up.
To figure out the lore of PvZHeroes, we need to look at the overall lore of the whole PvZ franchise and establish a timeline. Reasonably, we can place the first game as the very start of the PvZ timeline, mainly because it's before everything got incredibly confusing. Next in terms of release we have PvZ2, however garden warfare can be determined as coming first, since as you may have noticed, PvZ2 messes with time in an incredibly large number of ways, and GW is noticeably absent of any of it. PvZ2 is then followed by garden warfare 2, made possible by all the time destabilization of the events of PvZ2, and then, finally, we have PvZHeroes, which comes after GW2. Theoretically, either could have come first, but we can definitively prove GW2 came first by Rose's flavor text, which proves that someone or something attempted to nerf her before the events of PvZH, which is referring to her loss of 25 health in GW2, brought about by prayers to the gods from the zombies that were made into reality.
So we have a definitive timeline. PvZ, then GW, then PvZ2, then GW2, then PvZH. Some of you may be asking about the critically acclaimed spinoffs such as PvZ Pinball, PvZ Aventures, PvZ Risk, all the chinese versions, and Use Your Brainz EDU, the educational version of PvZ2. However, through rigorous research, I have determined the following: PvZ Pinball and PvZ Risk have no lore value, so its place on the timeline is not relevant, PvZ Adventures was shut down due to Popcap realizing it didn't fit in the lore, thus proving it to be non-canon and irrelevant to the lore or the timeline, and all the chinese games are non-canon because I can't read chinese the lore doesn't fit. Just take my word on it.
Plants vs Zombies
So to start off, we have to take a look at where it all began. Plants vs Zombies initially looks like it has a shallow frame plot to justify the presence of plants fighting zombies on both of your lawns and your roof, but when you look deeper, you'll actually see that that is exactly what it is and they explain literally nothing whatsoever. But, there is some things we can learn from this game. First and foremost, the I, Zombie mode shows that both plants and zombies were