Spanish bluebells, bulbs native to the Iberian Peninsula come in a variety of colors. Flower spikes measuring 12 inches tall are covered in dainty, bell-shaped flowers in April. 'Queen of the Pinks' has pale pink flowers. They are good for mass planting and reliably hardy in the Chicago area. In its native habitat it frequently is found growing underneath the canopy of deciduous trees with deep root systems like oaks that permit the two species to live side by side without directly competing for soil nutrients. By the time the trees leaf out the bulbs have completed their growth cycle for the year and have begun to go dormant.