Want to grow something special? Our more perennials category includes unusual perennials or other perennial plants that you might not find at many retail stores. Selecting some of the less common perennial flowers can add interest to your garden. When selecting perennial plants to grow in your garden, first determine your hardiness zone and select plants that are suitable for that. Then consider your growing conditions, including how much sunlight the space receives and the soil type. Also take into account the growing space and the mature height and spread of the perennials. Other factors to consider are flower color, bloom time, water needs and maintenance needs.