the cow plant is only in the sims 2, you can not get one in the sims 3
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Yes. You have to earn enough skill points and then you can unlock it in the "items" section
It is unfortunately not included in an EP or SP, but has to be downloaded for 600 simpoints at the sims 3 store. The interactions are feed, play, and pet. It can also eat sims, After which it produces milk that can be drunk for a 7 days lasting good moodlet and (i think) a few extra days of life.
You must have a Sims 2 University expansion pack installed. You can get the cow plant as a career reward. Your sim must graduate college and get a job in the natural science career track to get it. You can also get a cow plant on the Sims 2 University with one of these 2 cheats: --Boolprop testingCheatsEnabled true. By using this you are allowing yourself many options you do not have in regular gameplay. To use these option press shift+click on the object you want to use. You will get a wide variety of new options for the object including "Force error." NEVER select the force error option for any object. To get the cow plant, Shift+click on the newspaper and unlock the natural science career reward. --OR, You can use the cheat Unlockcareerrewards. It will make all career rewards available to the sim you are controlling at the time.
You can buy them at the supermarket, or, if you have a watermellon or watermellon seeds, you can plant your own.
Lots are out. The sims 3 university, sims 3 nightlife, sims 3 adventures, sims 3 generations... you name it!