How do you plant seeds in the Sims 3?

You have to buy some fruit or veggies at the grocery or market first. Then go home and look at your sims' inventory, you should have the fruit/vegies inside. Click on it and you would see a action as <plant>. Click on plant and choose a spot in your garden. Water it daily and tend your plant when it has weeds. You should soon have the icon <harvest>. Enjoy your results and try to cook with them! They can upgrade the food's quality!