Origin
Senecio pseudaureus Rydb. ssp. semicordatus (Mackenzie & Bush) G.W. Douglas & G. Ruyle-Douglas, also known as yellowtop, is a native North American plant that can be found growing in dry plains and prairies, rocky slopes, and open woodlands from the southwestern United States to northern Mexico.
Common Names
The common name for Senecio pseudaureus Rydb. ssp. semicordatus is yellowtop, which refers to its bright yellow flowers that bloom in late summer. It is also sometimes referred to as golden ragwort, false goldenaster, or squaw weed.
Uses
Yellowtop has been used for medicinal purposes in traditional Native American herbal medicine, including as a poultice for wounds and as a tea to treat urinary tract infections. However, it should be noted that the plant contains toxic compounds and should not be consumed without proper preparation or dosage.
In addition to its medicinal uses, yellowtop is also cultivated as a garden plant for its bright yellow flowers, which attract pollinators such as bees and butterflies. It is a hardy perennial that can tolerate a range of growing conditions, including dry soils and full sun.
General Appearance
Senecio pseudaureus Rydb. ssp. semicordatus is a herbaceous perennial plant that grows up to three feet tall and two feet wide. It has long, narrow leaves that are serrated along the edges and grow in a rosette at the base of the plant.
The plant produces multiple stems that are topped with clusters of bright yellow flowers, each with 8-13 ray florets surrounding a yellow disc of numerous tiny florets. The flowers bloom in late summer and are attractive to pollinators. After flowering, the plant produces fluffy seed heads that are dispersed by the wind.
Overall, yellowtop is a striking plant with bright yellow flowers that stands out in a garden or natural landscape.
Light Requirements
Senecio pseudaureus Rydb. ssp. semicordatus typically grows in full sun to partial shade. It can tolerate some shade, but too much shade can lead to weak stems and poor growth. If grown indoors, it should receive bright, indirect light or direct sunlight through a window.
Temperature Requirements
This plant is native to dry and arid regions. As such, it can tolerate high temperatures and is drought-tolerant. It can thrive in temperatures ranging from 50 to 85 degrees Fahrenheit. However, extreme temperatures—either too hot or too cold—can stress the plant and lead to stunted growth or wilting. In areas with cold winters, the plant may require protection from frost.
Soil Requirements
Senecio pseudaureus Rydb. ssp. semicordatus prefers well-draining soil that is not boggy or waterlogged. A mix of sand, gravel, and loam is ideal. The soil should be on the slightly alkaline side, with a pH of 7.0-8.0. This plant can tolerate nutrient-poor soil, but adding compost or fertilizer can help improve growth and flowering. It should be noted that too much fertilizer can harm the plant.
Cultivation
The Senecio pseudaureus Rydb. ssp. semicordatus (Mackenzie & Bush) G.W. Douglas & G. Ruyle-Douglas plant is native to North America and is an ideal plant for cultivating in gardens and indoor pots. This plant prefers well-draining soil and thrives in areas with bright sunlight. However, too much direct sunlight can be damaging to the plant, so it's recommended to provide partial shade for optimal growth.
Watering Needs
The Senecio pseudaureus Rydb. ssp. semicordatus (Mackenzie & Bush) G.W. Douglas & G. Ruyle-Douglas plant requires moderate watering. Overwatering can lead to root rot, which can cause the plant to die. The best way to determine when your plant needs watering is to check the soil for dampness. If the soil is dry to the touch, it's time to water. If the soil is still damp, wait a little longer before watering.
Fertilization
Fertilization is essential for the Senecio pseudaureus Rydb. ssp. semicordatus (Mackenzie & Bush) G.W. Douglas & G. Ruyle-Douglas plant. It's recommended that you use a balanced fertilizer every four to six weeks during the growing season. This provides the necessary nutrients for the plant to grow strong and healthy. However, be careful not to over-fertilize, as this can cause harm to the plant.
Pruning
Pruning the Senecio pseudaureus Rydb. ssp. semicordatus (Mackenzie & Bush) G.W. Douglas & G. Ruyle-Douglas plant is essential for maintaining its shape and size. It's recommended that you prune dead or damaged leaves and stems regularly. Additionally, trimming back long stems can encourage the plant to grow fuller and bushier. However, be careful not to trim away too much, as this can stunt the plant's growth.
Propagation of Senecio pseudaureus Rybd. ssp. semicordatus (Mackenzie & Bush) G.W. Douglas & G. Ruyle-Douglas
Propagation of Senecio pseudaureus Rybd. ssp. semicordatus (Mackenzie & Bush) G.W. Douglas & G. Ruyle-Douglas can be achieved through several methods. These include seed propagation, vegetative propagation through stem cuttings, and division.
Seed Propagation
Senecio pseudaureus produces achenes, which can be collected from mature plants and used for seed propagation. The achenes should be collected when they are brown and dry, and can then be stored in a cool, dry place until planting. The ideal planting time for seeds is in the spring, after the last frost. Seeds should be planted in a well-draining soil mix to a depth of approximately 1/4 inch. Keep the soil moist until germination, which can take up to 21 days. Once seedlings have emerged, water them regularly and provide them with adequate light to promote healthy growth.
Vegetative Propagation through Stem Cuttings
Another method of propagation is through stem cuttings. Stem cuttings should be taken from mature plants in the spring or summer, when new growth is present. Cuttings should be approximately 4 to 6 inches in length and should contain at least one node and several leaves. Remove the lower leaves from the cutting and dip the cut end into rooting hormone powder. Place the cutting in a container filled with a well-draining soil mix. Keep the soil moist and cover the container with a clear plastic bag to maintain humidity. Once roots have formed, the plastic covering can be removed and the new plant can be transplanted into its permanent location.
Division
Senecio pseudaureus can also be propagated through division. This method involves dividing an established plant into smaller sections and replanting them in new locations. To divide a plant, carefully dig it up and separate the roots into smaller sections. Each section should contain both roots and shoots. The sections can then be planted in their new location, where they should be watered regularly until established.
Disease Management
Senecio pseudaureus Rydb. ssp. semicordatus (Mackenzie & Bush) G.W. Douglas & G. Ruyle-Douglas is generally a hardy plant that is not susceptible to many diseases. However, there are a few diseases that can affect this plant. The most common disease is powdery mildew.
Powdery mildew is a fungal disease that appears as a white powdery coating on the leaves, stems, and flowers. To prevent powdery mildew, make sure the plant is in a well-ventilated area with good air circulation. Also, avoid watering the leaves and try to water the soil directly at the base of the plant. If powdery mildew does appear, use a fungicide to treat the plant.
Pest Management
Senecio pseudaureus Rydb. ssp. semicordatus (Mackenzie & Bush) G.W. Douglas & G. Ruyle-Douglas is not generally a plant that attracts many pests. However, there are a few pests that you should watch out for.
Aphids are small insects that suck the sap from the leaves and flowers of the plant. To prevent aphids, make sure the plant is regularly fertilized, and use insecticidal soap to treat the plant if necessary. Spider mites are another pest that can affect the plant. Spider mites are tiny red or yellow insects that live on the underside of leaves. To prevent spider mites, mist the plant with water regularly and use insecticidal soap to treat the plant if necessary.
