Generally, you can plant anything in a sub-irrigated planter. If the plant you have in mind likes moist soil, it will thrive on a sub-irrigated planter. For the most part, sub-irrigated planters work best for vegetables. But you can use it for flowering plants, herbs, and others. The trick is to use a substrate or growing medium that is suited for your plant. You might want to use a porous substrate for succulents, cacti, or orchids because these plants don't like to sit in moist soil all the time. Vegetables such as cabbage, garlic, lettuce, tomatoes, and carrots that you can plant in a raised bed will do rather well in sub-irrigated planters. Just be sure that you get one that is big enough to accommodate these vegetables. Houseplants such as peace lily, African violets, coleus, and Boston fern will likewise thrive on these planters, as well as your choice of annuals and perennials.