Candytuft (Iberis sempervirens) is for May.

Iberis sempervirens (candytuft)

Iberis sempervirens (evergreen candytuft, perennial candytuft) is a species of flowering plant in the family Brassicaceae, native to southern Europe.

The larvae feed on the flowers and young fruits of Sinapis arvensis, Isatis tinctoria, Isatis glauca, Aethionema saxatile, Iberis sempervirens, Biscutella mollis, Biscutella laevigata, Bunias erucago and Aurinia saxatilis.