Rockcress: This alpine flower springs up in the high, barren mountain regions of most of Europe as well as Asia and North America. It naturally grows in moist, rocky ground or along streams and crevasses. Its foliage forms a dense mat close to the ground, while the stems support clusters of pure white, tiny flowers. Rockcress Germination: Since this plant does not tolerate being transplanted, direct sowing is the best method. In late fall or early spring, sow the seed just below the surface in full sun or partial shade. Germination should take place within 14-21 days at 60-70 degrees F. Thin seedlings to 8-10" apart. Rockcress grows in almost any soil, and does especially well in dry or poor soil. Good drainage is essential. Growing Rockcress Seeds: This plant does not need watering unless drought conditions persist. Though it tolerates some drought, high heat and humidity will have a damaging effect on rockcress. Since it spreads easily but does not become invasive, it makes an attractive native groundcover; it also grows well in rock gardens. After flowering, cut the stems back for attractive new growth. After two or three years of growing, divide the plant. Rockcress attracts butterflies and bees, and resists deer.