Common Sunflower (Annuus)

The Common Sunflower (Annuus) is generally described as an annual forb/herb. This is native to the U.S. (United States) has its most active growth period in the summer . The Common Sunflower (Annuus) has green foliage and inconspicuous yellow flowers, with an abuncance of conspicuous blue fruits or seeds. The greatest bloom is usually observed in the summer, with fruit and seed production starting in the summer and continuing until fall. Leaves are not retained year to year. The Common Sunflower (Annuus) has a short life span relative to most other plant species and a rapid growth rate. At maturity, the typical Common Sunflower (Annuus) will reach up to 9 feet high, with a maximum height at 20 years of 0 inches.

The Common Sunflower (Annuus) is easily found in nurseries, garden stores and other plant dealers and distributors. It can be propagated by seed. It has a moderate ability to spread through seed production and the seedlings have low vigor. Note that cold stratification is not required for seed germination and the plant cannot survive exposure to temperatures below 52°F. has medium tolerance to drought and restricted water conditions.

Plant Basics
Category
Growth Rate Rapid
General Type Forb/herb
Growth Period Summer
Growth Duration Annual
Lifespan Short
Plant Nativity Native to U.S.
Commercial Availability Routinely Available
Physical Characteristics
Bloom Period Summer
Displays Fall Colors Yes
Shape/Growth Form Single Crown
Drought Tolerance Medium
Shade Tolerance Intolerant
Height When Mature 9
Vegetative Spread None
Flower Color Yellow
Flower Conspicuousness Yes
Fruit/Seed Abundance High
Fruit/Seed Seasonality Summer Fall
Seed Spread Rate Moderate
Gardening Characteristics
Propagations (Ways to Grow) Seed
Moisture Requirements Medium
Cold Stratification Required No
Minimum Temperature 52
Soil Depth for Roots 8
Toxic to Nearby Plants No
Toxic to Livestock No
After-Harvest Regrowth Rate None
After-Harvest Resprout Ability No
Responds to Coppicing No
Growth Requirements
pH Range 5.5–7.8 pH
Precipitation Range 12–12 inches/yr
Planting Density 4800–11000 indiv./acre
Soil Textures Coarse, Fine, Medium
Soil Depth for Roots 8
Minimum Frost-Free Days 80 day(s)
Salinity Tolerance Low
CaCO3 Tolerance Medium
Sustainability & Use
Leaf Retention No
Palatability Medium
Fire Resistant No
Causes Livestock Bloating None

Source: USDA, NRCS, PLANTS Database, plants.usda.gov.
National Plant Data Center, Baton Rouge, LA 70874-4490 USA