They are growing.
surround the zombie with plants
You cant. Thats in Plants vs. zombies, not zombie farm.
You plant crops around a planted zombie. Harvest the zombie first or it wont work. The plants dont have to be fully grown.
Yes it does, if there is too many full grown plants. At least it does this for me.
They don't. Unless you leave them too long after wards
yes
Kittens are not grown on plants but born live much in the same as you or I.
Nothing
To get that farm banner on Zombie Farm, you've got to win an invasion and have some luck with the loot you get.
you cant .....
You buy it from the store.
shot it with an arrow