Sweet Annie

Artemesia annua (Asteraceae) 'Sweet Annie' or 'Sweet wormwood' known in China as qing-hao. TCM uses, dried flower/crafts, sweet scent.
 
Space the plants at least 3 to 4 feet apart in full sun so they’ll grow full and well branched. The plants will grow steadily until late summer, when they shoot up to 6 feet or more in height. This grows as an annual but will self-seed and be back year after year. Can grow well in poor soil and adaptable to dry soils.
 
From Mother Earth Living: "Sweet Annie’s most common home use is in crafts. It works well as a base material in wreaths (see instructions below) and swags, and it’s an excellent filler in bouquets and arrangements. Long branches can be used whole or broken into smaller pieces, depending on the size of the arrangement. Handling dried sweet Annie can generate quite a bit of dust, but this will be minimized if you mist the branches with water before you start to work. The fragrance of sweet Annie is more pronounced during humid weather. Some folk like to hang a bunch in a bathroom, where the damp air will release the fragrance. Crumbling the dried herb over a carpet before vacuuming is another way to enjoy its sweet scent."