Rudbeckia hirta

Black-eyed Susan (R. hirta)
General Botanical Characteristics: Black-eyed Susan is a native, warm-season, annual, biennial or short-lived perennial forb. It has one to a few stems 12 to 40 inches (0.3-1.0 m) tall, which are erect and sometimes sparingly branched. The lower leaves are 2 to 6 inches (5-15 cm) long, alternate and petioled. The upper leaves are mostly sessile. The inflorescences are few to many flower heads on peduncles 2 to 8 inches (5-20 cm) long. The fruit is an achene 0.06 inches (1.5 mm) long; there is no pappus. Black-eyed Susan has a taproot or a cluster of fibrous roots. It is a mycorrhizal species.
Sometimes flower stalks will appear in the first summer, but typically black-eyed Susan blooms from June to September of the second year. After flowering and seed maturation, the plants die. The seed is very small (1,746,000 per pound) and black, about 2 mm long and 0.5 mm in diameter.
Adaptation and Distribution: Black-eyed Susan is naturalized in most of the states east of Kansas and the bordering areas of Canada. It is adapted throughout the Northeast on soils with a drainage classification range from well-drained to somewhat poorly drained. It will perform acceptably on droughty soils during years with average or above rainfall, but best growth is achieved on sandy, well drained sites. It is winter hardy in areas where low temperatures are between -30 ° and -20 °F.
Uses: Erosion control: Black-eyed Susan is an important component in critical area treatment plantings along with grasses, legumes, and other forbs when used along road cuts, hillsides, and other areas subject to erosion.
Wildlife: This plant offers protection and food to several song and game birds.

Sources and further reading:
USDA
USDA Forest Service
University of Maryland, College Park (image source)

Echinacea purpurea

Purple Coneflower (E. purpurea)
Height: 2-3 feet
Germination: 15-30 days
Optimum soil temperature for germination: 70F-75F
Sowing depth: 1/8"
Blooming period: June-October
Suggested use: Borders, meadows, mixtures, floral gardens.
Uses, Cautions, and Preparation: The aboveground parts of the plant and roots of echinacea are used fresh or dried to make teas, squeezed (expressed) juice, extracts, or preparations for external use.
Echinacea has traditionally been used to treat or prevent colds, flu, and other infections. Echinacea is believed to stimulate the immune system to help fight infections. Less commonly, echinacea has been used for wounds and skin problems, such as acne or boils.
Studies indicate that echinacea does not appear to prevent colds or other infections. Other studies have shown that echinacea may be beneficial in treating upper respiratory infections.
When taken by mouth, echinacea usually does not cause side effects. However, some people experience allergic reactions, including rashes, increased asthma, and anaphylaxis (a life-threatening allergic reaction). In clinical trials, gastrointestinal side effects were most common. It is important to consult your health care providers about any herb or dietary you are using, including echinacea. This helps to ensure safe and coordinated care.
Miscellaneous: E. purpurea is indigenous to the SE and Midwestern United States. An excellent variety for cut flower arrangements with a vase life of 5 to 7 days. Propagation from root cuttings is reliable if performed in the fall.

Sources and further reading:
Texas A&M University
National Center for Complementary & Alternative Medicine
Missouri State University (image source)