@xGolden_Warfarex
I would say for overheal it should be 25 since I think 50 might be too good. Another way it could go is overheal will increase the target's health by 25%. This would also apply to the spawnable weeds and maybe pots. I did out the math for each varient for each class on plants, except it doesn't include health upgrades since I can't recall and do not have them all so let me know what they are if you want. Also some of the calculations were in decimal so I rounded it and will give the actual one I got but I will give a range of what the health could be.I will do the stock varient for each plant class and any varients that have a different base health than their stock varient. So any varients not mentioned have the same health as the stock varient.
Citron overgeal 250HP increase by 50HP
Iron Citron overheal 300-315HP (actual 313HP) Increase by about 63HP (actual 62.5HP)
Peashooter overheal 150-155HP (actual 155HP) increase by about 30HP (actual 31.25HP)
Agentpea overheal 125HP increase by 25HP
Rock pea overheal 185-190HP (actual 188HP) increase by about 38HP (actaul 37.5HP)
Sunflower overheal 125HP increase by 25HP
Metalpetal overheal 185-190HP (actual 188HP) increase by about 38HP (actual 37.5HP)
Vampire flower overheal 100HP (actual 94HP) increase by about 19HP (actual 18.75HP)
Chomper overheal 220HP (actaul 219HP) increase by about 44HP (actual 43.75HP)
Hot Rod overheal 125HP increase by 25HP
Toxic overheal 185-190HP(actual 188HP) increase by about 38HP (actual 37.5HP)
Count Chompula overheal 155HP increase by about 30HP (actual 31.25)
Armor Chomper overheal 250HP increase by 50HP
Cactus overheal 155HP increase by about 30HP (actual 31.25)
Jade overheal 185-190HP (actual 188HP) increase by about 38HP (actual 37.5HP)
Rose overheal 125HP increase by 25HP
Corn overheal 185-190HP (actual 188HP) increase by about 38HP (actual 37.5HP)
I didn't do potted plants or spawnable weeds since I think Input in enough here and is the more important thing.