This will depend on your system. You can't grow trees like this for a start. Many systems also can't handle root vegetables since there isn't enough space and many root vegetables also need to dry out, so they may not work well. Many systems can't handle things like garlic or onions. Some crops like corn and vine plants are difficult or even impossible to grow. Look into your intended crops before you try planting them and waste a space that could be producing for you. If you have space, you could always experiment so long as you know it might not succeed.