Origin
Packera eurycephala (Torr. & Gray ex Gray) W.A. Weber & A. Löve var. lewisrosei (J.T. Howell) T.M. Barkl., comb. nov. ined. belongs to the Asteraceae family and is native to North America, specifically in the western parts of Canada and the United States.
Common names
Common names for Packera eurycephala (Torr. & Gray ex Gray) W.A. Weber & A. Löve var. lewisrosei (J.T. Howell) T.M. Barkl., comb. nov. ined. include Lewis' packera, Lewis' butterweed, and yellowtop.
Uses
Packera eurycephala (Torr. & Gray ex Gray) W.A. Weber & A. Löve var. lewisrosei (J.T. Howell) T.M. Barkl., comb. nov. ined. is mostly used for ornamental purposes due to its attractive yellow blossoms that bloom during the spring and summer seasons.
General appearance
Packera eurycephala (Torr. & Gray ex Gray) W.A. Weber & A. Löve var. lewisrosei (J.T. Howell) T.M. Barkl., comb. nov. ined. generally grows up to 1-2 feet in height, with bright green leaves that alternate on the stem. The yellow flowers have a diameter of approximately 1 inch and grow in clusters at the top of the stem. When in full bloom, the entire plant is covered in vibrant yellow colors, making it a popular choice for gardeners and landscapers alike.
Growth Conditions for Packera eurycephala var. lewisrosei
Packera eurycephala var. lewisrosei is a plant that grows best in specific light, temperature, and soil conditions. It is a native species of western North America and is commonly found in rocky and sandy areas in the intermountain regions.
Light Requirements
This plant prefers partial to full sunlight. In areas with hot climates, it may require some shade during the hottest part of the day. However, in cooler climates, it can tolerate full sunlight. It is essential to avoid constant direct sunlight as it can scorch the leaves and stem.
Temperature Requirements
The ideal temperature range for this plant is between 45°F to 75°F. It can withstand temperatures as low as -30°F but is not tolerant of high temperatures above 100°F. It is suitable for growing in USDA hardiness zones 5 to 9.
Soil Requirements
This plant prefers well-drained, sandy loam soil but can also thrive in gravelly or rocky soil. It cannot tolerate heavy soil or waterlogged soil, which can cause root rot. It prefers slightly alkaline soil with a pH range of 6.5 to 7.5. The plant is drought-tolerant once established, but regular watering during the initial growth phase is necessary.
Cultivation
Packera eurycephala var. lewisrosei requires well-draining soil with a neutral pH level. It prefers full sun to partial shade and needs to be grown in a spot that provides adequate air circulation.
This variety of Packera eurycephala is hardy to USDA zones 6-9 and can be grown as a perennial. It is recommended to grow it in a raised bed if soil drainage is a concern in your area.
Watering Needs
Packera eurycephala var. lewisrosei should be watered deeply once a week during the growing season. Letting the soil dry out partially between waterings is preferred to avoid overwatering, which can lead to root rot.
During periods of extreme drought or heat, it may be necessary to increase watering frequency to keep the plant hydrated.
Fertilization
Packera eurycephala var. lewisrosei does not typically require regular fertilization. If you notice the plant's growth is slow or its leaves are turning yellow, it may benefit from a balanced fertilizer application in the early spring before new growth begins.
Be sure to follow the package instructions for application rates and timing to avoid overdoing it with fertilizer, which can be harmful to the plant.
Pruning
Packera eurycephala var. lewisrosei does not require much pruning, but it can be helpful to deadhead spent flower blooms to encourage new growth and maintain a tidy appearance.
If the plant becomes leggy or overgrown, it can be pruned back by one-third in the early spring before new growth emerges.
Be sure to use sterile pruning shears to avoid introducing diseases or pests to the plant.
Propagation of Packera eurycephala var. lewisrosei
Packera eurycephala var. lewisrosei can be propagated easily by seed, division, and cuttings.
Propagation by Seed
Seeds of Packera eurycephala var. lewisrosei can be obtained from mature plants or collected from the wild. The seeds should be sown in a well-draining potting mix and kept moist until germination. Germination usually takes place within 2-3 weeks.
Propagation by Division
Dividing a mature Packera eurycephala var. lewisrosei plant is a straightforward way to propagate this plant. Using a sharp and clean knife, divide the root ball into 2 or more pieces, making sure that each division has a good supply of roots. Transplant the divisions to their new location and water thoroughly.
Propagation by Cuttings
Cuttings of Packera eurycephala var. lewisrosei can be taken in the spring or early summer. Cut a stem of approximately 4-6 inches long and remove all but the top 2-3 leaves. Dip the cut end in a rooting hormone, and insert the stem into a well-draining potting mix. Keep the soil moist and place the pot in a bright location out of direct sunlight. Rooting will occur in 2-3 weeks.
Disease Management
Like most plants, Packera eurycephala var. lewisrosei can be affected by different types of diseases that can damage its leaves, flowers, and stems. The most common diseases that affect this plant include:
- Crown rot: This disease is caused by a soil-borne fungus that attacks the roots of the plant, causing wilting and yellowing of leaves. To manage this disease, remove infected plants and avoid planting in the same area for at least two years.
- Powdery mildew: This fungus appears as a white powdery growth on the surface of the plant's leaves. To prevent and manage the disease, avoid overhead watering and crowded plantings.
- Leaf spot: This fungal disease causes black or brown spots on the foliage and may result in defoliation. To manage the disease, remove infected leaves and avoid overhead watering.
Pest Management
Aside from diseases, Packera eurycephala var. lewisrosei can also be affected by different pests that feed on its leaves and flowers. The most common pests that affect this plant include:
- Aphids: These small, soft-bodied insects suck the sap from the leaves and stems, causing them to curl and distort. To manage the pest, spray the plant with a strong stream of water or use insecticidal soap.
- Spider mites: These tiny pests spin webs on the underside of leaves, sucking the plant's sap and causing yellowing and bronzing of leaves. To manage the pest, spray the plant with a strong stream of water or use insecticidal soap.
- Thrips: These small, slender insects feed on the foliage, flowers, and fruit of the plant, causing silvering and distortion of leaves. To manage the pest, remove infested leaves and avoid overhead watering.
Regular monitoring of the plant for pests and diseases can help prevent or manage their spread. It is also important to maintain good cultural practices, such as proper watering and fertilization, to keep the plant healthy and less susceptible to pests and diseases.
