Here's a history of day plants in pvz pvza and pvz2.
In pvz1 it shoots a pea at zombies. It was the first plant in the game more Peashooters which are snow pea repeater and spilt pea.
In PVZA it was also the first plant to get.
Other Peashooters here are repeater and snow pea.
In PVZ2 it is again the first plant you get. If plant food is on it it will turn into Gatling Pea ans shoot 60 peas.
In PVZ1 it produces 25 sun every 24 seconds. It is the most important plant to use. It's upgrade is Twin Sunflower. It is the second plant in this game.
In PVZA it is the same as the PVZ Sunflower.
In PVZ2 it is the second plant. It produces 150 sun if plant food is on it.
In PVZ it explodes and kills all zombies in a 3x3 area. It also destroys ladders on defensive plants. It is the third plant in this game.
In PVZA it is the same as the PVZ1 Cherry Bomb. It is only unlocked later.
The PVZ2 it was unlocked by a pirate seas gate. It is now the last plant in pirate seas. It has no plant food power.
In PVZ1 it was more stronger than other plants with 72 bites. Wall-Nut First Aid can be purchased in Crazy Dave's shop which can make a full Heath Wall-Nut be planted on a low health Wall-Nut. It is the forth plant in this game.
In PVZA it's VIP is hard-nut.
In PVZ2 it is the third plant in this game if plant food is on it it will be more stronger and has metal around it.
In PVZ1 it explodes and can kil one or two zombie by it. It can also kill underground digger zombies. Before exploding it taks 15 seconds to arm. It is the fifth plant in this game.
In PVZ2 it is the fourth plant in this game. It will plant two other Potato Mines if plant food is on it.