You cannot have PlantSims in The Sims 3, unless you have University Life installed as well in your computer.
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I don't think you can. I think you need to wait until they are big enough to drink the Plantophic-C you can buy from the Garden Club or the Gypsy Matchmaker.
Lots are out. The sims 3 university, sims 3 nightlife, sims 3 adventures, sims 3 generations... you name it!
If you get your sim to spray heaps of bug-infested trees and plants then they will eventually turn into a plantsim. Then you can choose the option "talk to", when you click on a plant or a tree, and they get really healthy.
To make a plant sim you have to have the Sims 2 Seasons.. Then have the person you want to make a plant sim spray A LOT of trees until a cloud forms around them and they are a plant sim.( the cloud is like when someone attacks them)
No, you cannot have Sims 2 pets on Sims 3. You must have Sims 3 pets for Sims 3 or Sims 2 pets for Sims 2.