The allure of unique yellow flowers in a garden cannot be overstated. Quite simply, they are a source of joy, tonal transformation and endless cheer. For anyone who loves gardening with color, yellows have profound significance, signifying friendship, abundance and hope. As well as providing a strong pop of color in the garden, plants with yellow flowers also attract many precious pollinators. Here are some of the most unusual, dramatic and easygoing yellow flowers available. From delicate fritillaria and fluffy sunflowers to robust roses, they are sure to give your backyards and growing spaces a boost of sunny warmth.  …