Nature seemed like a natural category to have, with seasons and weather. I ended up with a few other subcategories. I ended up splitting food and plants up. Pizza isn't really a plant, but it is from nature, so. . . food! Creepy carrots could go in either, but since it wasn't really about growing carrots, and more about eating carrots it ended up in NATURE FOOD REYNOLDS.
These are the subcategories I used for Nature
Camping- we live in a touristy camping area.
Conservation- small, small section, but when Earth Day comes around they are easier to find.
Food- food we eat, including plants that are being eaten or put in soups or on pizza.
Nature- water cycle, random nature love books, anything that doesn't fit into the other sub-categories.
Plants- Growing and harvesting go here, trees, flowers, and books about gardening.
Seasons- spring, summer, fall and winter are all here.
Weather- rain, wind, storms, tornadoes and other weather related books go in this section.
So where do those pesky apple books go? Seasons, food, plants? That is what I love about this organization system so much, it is flexible. If the book is not going out in seasons, I move it to food, or plants.