Overview
Chrysothamnus nauseosus (Pallas ex Pursh) Britt. var. washoensis (L.C. Anders.) Cronq. is a perennial plant native to North America. It is part of the Asteraceae family and is commonly referred to as rubber rabbitbrush, gray rabbitbrush or chamisa.
Appearance
The plant typically grows up to 1.5 meters tall and has a spread of about 1 meter. It has woody stems and narrow leaves that are gray-green in color and appear to be covered in fine hairs. The yellow flowers appear in clusters and bloom in late summer or early fall, typically from August to October.
Origin and Habitat
Rubber rabbitbrush is native to North America and can be found in various habitats such as arid regions, plains, mountain slopes, and prairies. It is commonly found in the western United States, including Alaska, Arizona, Colorado, Idaho, Montana, Nevada, New Mexico, Oregon, Utah, and Wyoming.
Uses
Rubber rabbitbrush has a number of uses, including its utilization in the food and medicinal industries. Native Americans used it as a medicine for various ailments such as coughs and colds. The plant's leaves and flowers can also be used to make a tea that can help reduce fevers. Additionally, the rubber rabbitbrush is a source of food for various wildlife species such as pronghorn and elk as well as domestic animals.
Light
Chrysothamnus nauseosus var. washoensis prefers full sunlight for optimal growth. They can tolerate some shade, but too much shade will cause stunting and reduced flower production.
Temperature
This plant variety grows best in areas with a temperate climate. The ideal temperature range for growth is between 55°F and 85°F (12°C to 29°C). These plants can tolerate some cold weather and are hardy down to USDA zone 5, but extended periods of freezing temperatures can damage the plant.
Soil
The soil requirements of Chrysothamnus nauseosus var. washoensis are flexible but prefer well-draining soils. The plant can tolerate a range of soil types, including sandy, loamy, rocky and clay soils. The soil pH range should be slightly acidic to slightly alkaline, with an optimal range between 6.0 and 7.5. The soil should also be rich in organic matter, which helps improve water retention and nutrient availability.
Cultivation Methods
Chrysothamnus nauseosus (Pallas ex Pursh) Britt. var. washoensis (L.C. Anders.) Cronq. is a hardy perennial plant that can tolerate harsh conditions, making it an ideal plant for xeriscaping and low-maintenance landscapes. It prefers full sun and well-draining soil, and can be grown from seeds or cuttings planted in the spring or fall.
Watering Needs
While Chrysothamnus nauseosus (Pallas ex Pursh) Britt. var. washoensis (L.C. Anders.) Cronq. is drought-tolerant, it still requires moderate watering during its first year to establish a deep root system. Afterward, it can be watered occasionally during extended dry spells.
Fertilization
Chrysothamnus nauseosus (Pallas ex Pursh) Britt. var. washoensis (L.C. Anders.) Cronq. does not require frequent fertilization. However, it can benefit from a light application of compost or slow-release fertilizer in the spring to promote growth and support flowering.
Pruning
Pruning Chrysothamnus nauseosus (Pallas ex Pursh) Britt. var. washoensis (L.C. Anders.) Cronq. is generally not necessary. However, it can be trimmed in the fall to maintain shape and prevent the plant from becoming too woody. Dead branches can also be pruned at any time of the year.
Propagation of Chrysothamnus nauseosus var. washoensis
Chrysothamnus nauseosus var. washoensis can be propagated through several methods:
Seed Propagation
Seeds of Chrysothamnus nauseosus var. washoensis can be collected in the fall after the seedheads have fully ripened and turned brown. The seeds can then be stored in a cool and dry place until the following spring. To propagate the plant, the seeds can be planted in well-draining soil in a sunny location. Germination typically occurs within 2-3 weeks, and the seedlings can be transplanted to individual containers or to the desired location in the garden when they reach a height of 2-3 inches.
Cuttings Propagation
Chrysothamnus nauseosus var. washoensis can also be propagated through stem cuttings taken in the spring or early summer. The cuttings should be around 4-6 inches long and taken from the current season's growth. The lower leaves should be removed, and the cut end should be dipped in rooting hormone before being planted in a well-draining potting mix. The cuttings should be kept moist and in a warm, humid location until they develop roots, which usually takes around 4-6 weeks. Once rooted, the cuttings can be transplanted to individual containers or to the desired location in the garden.
Division Propagation
Chrysothamnus nauseosus var. washoensis can also be propagated through division. This is typically done in the spring or fall when the plant is actively growing. The plant should be dug up, and the root ball should be gently separated into sections, making sure each section has both roots and shoots. The sections can then be replanted in well-draining soil in a sunny location. It is important to water the newly planted sections regularly until they are established.
Disease Management
The plant Chrysothamnus nauseosus var. washoensis is generally resistant to many diseases. However, it is susceptible to some fungal diseases, including rust and powdery mildew. To manage these diseases, it is important to ensure proper cultural practices. This includes providing adequate plant spacing to ensure good air circulation and avoiding overhead watering to prevent moisture buildup. Additionally, the use of fungicides may be necessary in severe cases, but should be used as a last resort.
Pest Management
There are several pests that can affect the Chrysothamnus nauseosus var. washoensis plant. Some of the most common pests include spider mites, aphids, and caterpillars. To manage these pests, it is important to regularly monitor the plants for signs of damage and infestation. In many cases, simply removing the affected leaves or sections of the plant will be enough to control the pest population.
Another effective method of pest management is the use of insecticidal soaps and horticultural oils. These products are environmentally friendly and can be applied directly to the affected areas of the plant. However, it is important to follow the manufacturer's instructions carefully to avoid damaging the plant or harming beneficial insects.
Finally, it is important to encourage natural predators of pests, such as ladybugs and lacewings, to help control pest populations. Providing a diverse range of plants in the garden can help attract and support these beneficial insects.
