(=‘Schneehaube’) Wall Cress is readily familiar as a widely planted rock garden or edging perennial, used for a bright spring display. Plants form a mounding cushion of olive-green leaves, bearing masses of sweetly fragrant, small snow-white flowers for several weeks. Drought tolerant once established. These require good drainage, particularly in the winter months. Shear plants lightly after blooming in order to maintain a bushy, compact habit. Evergreen.