Everyone will get a valentine zombie only on Valentine's Day.
If you want to get it before, set your time to the Valentine's day and open the game, then you will have it.
But every one can have only one valentine zombie.
During Valentine Day!
surround the zombie with plants
Combine flower zombie with flower zombie.
By levelling up
You combine two headless zombies in a zombie pot.
no it is not possible to create two files on zombie farm you can thank Remington C. for this answer
combine a zombot with a miny zombie or a regular zombie and you`ll get a zombitron.
Uh, no.
Punk
yes
Nothing
Use the zombie pot and combine ZomGoblin with another ZomGoblin. Edit: This *will* work, but you might get a Zombricaun, now, too.