Asperula tinctoria aka Dyer's Woodruff

Asperula tinctoria is a herbaceous perennial called dyer's woodruff. It belongs to the Rubiaceae family. Its native range spans Europe and reaches western Siberia. It grows in dry pastures, meadows, and rocky ground. Central and eastern European hillsides form part of its range. It is not native to Britain or Ireland. The name tinctoria refers to its use for dye.

Plants reach about 1.5 feet (0.46 metres) in height. They spread to about 2 feet (0.61 metres) across. Underground rhizomes let each plant form a small colony. Stems may stand upright or lie along the ground. Slim leaves grow in whorls spaced along each stem. Their shape ranges from narrow and straight to narrowly oval. Leaves reach about 0.125 feet (0.038 metres) in length. Small white flowers have three petals. They form loose panicles at the ends of stems. The flowering season runs from June through September.

Give this plant full sun for its preferred growing conditions. It also accepts some shade. It grows best in alkaline soil that drains well. Keep the soil evenly moist for best growth. Yet it also copes with poor and dry ground. Shallow, rocky soil does not rule it out. It accepts most soil types and a range of pH levels. Good drainage remains important across those soil conditions. Its stated hardiness range covers USDA zones 5–9. The listed water need is moderate, despite its dry-soil tolerance.

Dyer's woodruff suits herb beds and gardens grown for dyes. Its low form also fits the front edge of borders. Within its native range, it can spread through wildflower meadows. Forest edges and other natural planting areas also suit it. Its white flowers provide a summer display above the narrow leaves. The roots yield a red dye. Plants For A Future lists no known food uses. It also lists no known medicinal uses or hazards. That hazard record does not establish safety for eating or pets.

Care needs are low, according to Missouri Botanical Garden. It reports no major problems with pests or disease. Plants For A Future does not flag weed potential. Still, the rhizomes allow small colonies to develop. Seed, division, and young basal cuttings offer ways to raise plants. Cold treatment helps seed germinate. Sow seed from spring into early summer in a cold frame. Divide plants in spring or early summer. Take soft basal shoots for cuttings in early summer.