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Description
Agoseris Retrorsa, commonly known as spear-leaved agoseris, is a flowering plant that belongs to the sunflower family. It is native to North America and is commonly found in the western regions of the United States and Canada. This plant typically grows to a height of 6 to 18 inches and has a basal rosette of leaves. The leaves are long and slender, measuring up to 12 inches in length and 1 inch in width. The plant produces dandelion-like yellow flowers that bloom from May to September.
Taxonomic Information
| Domain | Eukarya |
| Kingdom | Plantae |
| Phylum | Anthophyta |
| Class | Eudicots |
| Order | Asterales |
| Family | Asteraceae |
| Genus | Agoseris |
Appearance
Agoseris Retrorsa has a unique appearance, with its long and slender leaves that taper to a point. The leaves grow from a basal rosette and are hairless and glossy green in color. The plant produces yellow flowers that resemble dandelions, with a central disk surrounded by ray flowers. The flowers bloom from May to September and are typically 1 to 2 inches in diameter. After flowering, the plant produces a fluffy ball of seeds that can be dispersed by the wind.
Care Guide
Agoseris Retrorsa is a hardy plant that is easy to care for. It prefers well-drained soil and full sun, but can also tolerate partial shade. The plant requires moderate watering and should be fertilized once a month with a balanced fertilizer. It is hardy to USDA zones 5 to 9 and can tolerate cold temperatures down to -20 degrees Fahrenheit.
Common Pests & Diseases
Agoseris Retrorsa is generally resistant to pests and diseases. However, it can be susceptible to powdery mildew and rust if the plant is grown in damp and humid conditions. Insect pests such as aphids and spider mites may also infest the plant, but can be easily controlled with insecticidal soap or neem oil.
Habitat
Agoseris Retrorsa is native to North America and is commonly found in the western regions of the United States and Canada. It grows in a variety of habitats, including dry rocky slopes, meadows, and open woods. The plant is well adapted to harsh conditions and can survive in areas with low soil fertility and limited water.
Question and Answer
Q: Can Agoseris Retrorsa be grown in containers?
A: Yes, Agoseris Retrorsa can be grown in containers as long as the soil is well-drained and the plant receives sufficient sunlight.
Q: How often should Agoseris Retrorsa be watered?
A: Agoseris Retrorsa should be watered moderately, about once a week or when the soil feels dry to the touch.
Q: How do I propagate Agoseris Retrorsa?
A: Agoseris Retrorsa can be propagated by seed or by division in the spring or fall.
Q: Is Agoseris Retrorsa deer resistant?
A: Yes, Agoseris Retrorsa is deer resistant.
Related Plants
- Agoseris glauca
- Agoseris heterophylla
- Agoseris parviflora
References
- https://www.fs.fed.us/wildflowers/plant-of-the-week/agoseris_retrorsa.shtml
- https://www.nps.gov/yell/learn/nature/spear-leaved-agoseris.htm
- https://www.wildflower.org/plants/result.php?id_plant=AGRE2
