The first thing a gardener plants in the garden riddle is seeds! Seeds can be planted directly into the soil or started indoors and then transplanted outdoors. Planting seeds is an important step for any gardener, as it allows them to grow their own fruits, vegetables, and flowers from scratch. For best results, make sure to choose high-quality seed varieties that are suitable for your climate and growing conditions. Additionally, read up on proper planting techniques before getting started to ensure you get off on the right foot with your gardening journey!