For the days when they can't dig in the real dirt outside, this little window box from Kushies toys is a great find. It even doubles as a carrying case with a handle and zipper so your toddler can put other things inside and use it for day trips.
It comes with eleven magnetic garden accessories including the magnetic creatures and plants. This seems like a fun way to begin learning about the outdoors for your littlest ones. Its available at Kushies.