Not long after we walked in I told her the plan:
"You can pick out one flower and one vegetable, OK?"
"OK!" Miss M spun around, "I want this one!" As she grabbed a pot of flowers half her size off a bottom shelf.
The vegetable section was a little depleted so I decided on some mint. It's sturdy and grows fast so she'll be able to watch it grow.
We came home and transplanted them into some empty pots. Then Miss M had to do some "tree magic" to help them along. If you haven't seen Totoro you won't know what I'm talking about, but it's kind of a thing in our house.