Arabis caucasica

Arabis caucasica is a species of flowering plant in the mustard family (Brassicaceae) known by the common names garden arabis, mountain rock cress or Caucasian rockcress. It is native to south eastern Europe and the Mediterranean. It is also present in the Madeira Archipelago.
Description.
This is an evergreen perennial herb growing to 0.2 m (0 ft 8in) by 1 m (3 ft 3in), flowering in early spring, with white hermaphrodite flowers, pollinated by bees.
Cultivation.
It is hardy to zones 4-9 and is not frost tender. A popular ornamental garden plant for its early flowers, cultivars include the pink 'Compinkie'. Under its putative synonym "A. alpina" subsp. "caucasica", the cultivars 'Flore Pleno' and 'Schneehaube' have gained the Royal Horticultural Society's Award of Garden Merit.