Bellflowers are a diverse group of plants that come in many sizes and varieties. From diminutive alpine species to upright woodland varieties perfect for cut flowers, there are a number of plants to choose from. However, they all have their signature bell-shape blossoms in common. These cheery little bells grace plants for long periods of time, generally starting in late spring and continuing through summer. No matter what type of garden setting you have, you are bound to find a bellflower that fits your needs.