The Cow Plant.

Yeah, the one Sim of mine got obsessed with the cow plant also and I figured no harm in that. Then the day happened he forgot to feed her and I stopped him in the nick of time before he was going to eat that cake and get eaten himself. (I love hitting exit right quick for stupid situations like that.) Since then I put the cow in my household inventory. I bring her out every now and then and somehow the obsessive behavior with my Sims and the plant have stopped. I monitor how long she's out and then put her back in inventory. Give that a try and see if it helps maybe?

I put a fence around my garden and lock the gate until I want the Sims to interact with it. Now that we have terrain tools, the next time I play with a cowplant, I'll probably lift it up so they can't get to it.

Thanks, I'll give that a try. It's funny because although it refuses feeding each time they do it, it seems to be putting out the cake a lot quicker than I remember it doing.