You can grow most of the leafy vegetables including the lettuces & the spinaches, most of the vegetables: tomatoes, egg plants, chillies to name a few, dwarf varieties of flowering plants and most ornamental plants.
What you cannot grow on your Easygro Stele are the root crops like the onions & the carrots and heavier & taller plants. Check out the section that contains a detailed list of plants that can be ideally grown on your Easygro Stele.