Columbine 'Calimero' attracts butterflies, bees, and hummingbirds; its spring bloom makes it valuable as an early-season nectar source. It is also deer and rabbit resistant and grows well in the dappled sun of woodland edges and sunnier rock gardens. It is a small delight, perhaps best in containers, where the plum and soft yellow dangling blooms can be appreciated up close. Cut flower stalks after bloom to encourage a rebloom. In their first year of growth, perennials bulk up roots and foliage, blooming more abundantly starting the second year. Caution: contains some toxic elements especially in the roots and foliage.