This is one of the herbs that popped back up in my garden on its own this year. I was stumped trying to figure out which herb it is and spent a few hours looking for a similar one on the Internet this week.
I was even considering asking for help in a number of gardening forums I belong to, but as lluck would have it I saw this while I was at the nursey yesterday ~ it's Sweet Woodruff.
Use sweet woodruff plants as a ground cover for shady areas in the landscape, as this plant will spread out to form a mat and choke out weeds. However, sweet woodruff's use doesn't end when the growing season ends. In former times, sweet woodruff herbs were commonly harvested and used for medicinal and culinary purposes. E.g., the fresh leaves were used medicinally to heal wounds. Nowadays, we more often enjoy this herb for its aromatic quality. It lends a fragrance to linens, sachets and potpourris.
The intensity of the fragrance of sweet woodruff's foliage increases when dried, and its aromatic quality lasts for years. It is, consequently, a favorite in potpourris and wreaths. The fragrance of sweet woodruff herbs has been variously described as resembling new-mown hay or vanilla.
For optimal fragrance, harvest the leaves of sweet woodruff right after the plants bloom. The harvested branches can be tied in bunches and hung in a warm, dark place to dry.