Overview
Thlaspi glaucum (A. Nels.) A. Nels. var. pedunculatum Payson is a highly attractive perennial herbaceous plant that belongs to the family Brassicaceae. This plant is native to western North America, particularly in the southwestern United States, including Arizona, Utah, New Mexico, and Colorado.
Common Names
This plant is commonly known by various names such as Rocky Mountain pennycress, Basin thlaspi, and Glaucous pennycress. These common names are attributed to its natural habitat, appearance, and unique features.
Appearance
The Thlaspi glaucum var. pedunculatum is a small, clumping perennial herb that typically grows up to 15-45 cm in height and 10-30 cm in width. The plant features long basal leaves and narrow, erect stems that are densely covered with small, white hairs. The leaves are typically oblong to spoon-shaped, and the plant produces beautiful clusters of bright yellow flowers that bloom from May to August.
Uses
Thlaspi glaucum var. pedunculatum is primarily used as an ornamental plant in gardens and landscapes due to its attractive foliage and bright yellow flowers. The plant prefers well-draining soils and is tolerant of drought, making it a perfect choice for xeriscaping. It is also used in restoration and reclamation projects in areas affected by mining and other disturbances. Besides, some indigenous communities use the plant as a traditional medicine to treat various ailments such as stomachaches, pneumonia, and colds.
Growth Conditions for Thlaspi glaucum var. pedunculatum
Thlaspi glaucum var. pedunculatum, commonly known as mountain pennycress, is a plant species that is native to the western regions of North America. This low-growing perennial plant has a preference for specific growth conditions that must be provided for its optimal growth.
Light Requirements
Thlaspi glaucum var. pedunculatum thrives in full sun to partial shade. It requires at least 6 hours of direct sunlight each day to survive. Insufficient sunlight can cause the plants to stretch and grow weak stems, leading to a decreased ability to support themselves. Therefore, it is essential to provide the plant with an environment that receives enough sunshine to ensure their healthy growth.
Temperature
Thlaspi glaucum var. pedunculatum prefers to grow in cooler temperatures. It is known to grow in lower altitudes where the temperature remains lower all year-round. The optimal temperature for this plant is between 50-60°F (10-16°C). The plant can sustain extreme temperatures, but it starts to show noticeable stress beyond this range. If the temperature rises above 80°F (27°C), the plant begins to wilt and stop growing.
Soil
The mountain pennycress can grow in different types of soils, provided they are moist and well-drained. The plant requires a well-draining soil with a pH level ranging between 5.5 and 7.5. Acidic soils can be harmful, resulting in slower growth or even death. In contrast, alkaline soil can promote the growth of weeds, which compete with the plant for nutrients and hinder its growth. Therefore, it is essential to maintain the proper pH level and fertility of the soil to allow the plants to grow without any hindrance.
Cultivation Methods
Thlaspi glaucum var. pedunculatum Payson is a hardy perennial plant that is well-suited for growth in cold climatic conditions. It can be cultivated both indoors and outdoors. The plant prefers well-draining, sandy soil and full exposure to sunlight for at least six hours a day. The ideal planting time for Thlaspi glaucum var. pedunculatum Payson is during the fall season.
The plant can be propagated by seed, cuttings, or division of the root ball. Plant the seeds or cuttings in peat pots, or directly into the soil about 1-2 inches deep. Ensure that there is enough space between individual plants, as Thlaspi glaucum var. pedunculatum Payson can spread up to 12 inches wide.
Watering Needs
Thlaspi glaucum var. pedunculatum Payson requires adequate watering, especially during the growing season. Water the plant regularly, ensuring that the soil remains evenly moist. However, do not overwater as the plant is susceptible to root rot. During winter, reduce the watering frequency, as the plant goes into dormancy and can tolerate dry conditions.
Fertilization
Thlaspi glaucum var. pedunculatum Payson benefits from occasional fertilization to promote healthy growth and development. Apply a balanced, slow-release fertilizer during the initial planting, then every six months thereafter. Alternatively, use organic fertilizers such as compost, manure, or bone meal. Avoid applying excessive amounts of fertilizer as it can lead to salt accumulation harmful to the plant.
Pruning
Thlaspi glaucum var. pedunculatum Payson does not require heavy pruning and is relatively low maintenance. However, deadheading or removing spent flowers helps to promote the growth of new buds, ensuring a more extended bloom period. Cut back the stems to the ground level during the fall season to stimulate new growth in the spring.
Propagation of Thlaspi glaucum var. pedunculatum
Thlaspi glaucum var. pedunculatum, commonly known as Rocky Mountain pennycress, is a herbaceous perennial plant that belongs to the Brassicaceae family. The plant is native to western and central North America, and it can be propagated via seeds or division.
Propagation by Seeds
The most common method of propagating Thlaspi glaucum var. pedunculatum is by seeds. The seeds are best sown in the fall or early spring, and they require no special treatment before sowing. However, it is recommended to cold-stratify the seeds for six to eight weeks to improve their germination rates.
To cold-stratify the seeds, place them in a plastic bag with a damp paper towel. Seal the bag and keep it in the refrigerator for six to eight weeks. After cold stratification, sow the seeds in a well-draining soil mix and cover lightly with soil. Keep the soil moist, and the seeds should germinate in two to three weeks.
Propagation by Division
Thlaspi glaucum var. pedunculatum can also be propagated via division. This is best done in late spring or early summer, when the plant is in its active growth phase. Simply dig up the plant, and gently separate the roots into smaller sections using a sharp knife or garden fork. Be sure to ensure that each section has a healthy shoot and root system.
Plant each new section in a well-draining soil mix, and water thoroughly. Keep the soil moist until the plant becomes established in its new location.
Disease Management
Thlaspi glaucum var. pedunculatum is relatively resistant to most diseases. However, it is still susceptible to a few prevalent diseases, including:
- Downy Mildew (Peronospora parasitica): This fungal disease affects the leaves and stems of the plant, causing yellow patches on the upper surface of the leaves and white mildew on the undersides. To manage Downy Mildew, avoid overhead watering, improve air circulation, and keep the plant dry.
- Clubroot (Plasmodiophora brassicae): This soil-borne disease affects the roots and causes stunted growth, wilting, and yellowing of leaves. To manage clubroot, follow a crop rotation program, use disease-free soil, and avoid planting susceptible plants in infected soil.
Pest Management
Thlaspi glaucum var. pedunculatum is also relatively resistant to pests. However, it can still attract a few common pests, such as:
- Whiteflies: These tiny flies feed on the leaves of the plant, reducing its vigor and leading to stunted growth. To manage whiteflies, use sticky traps, introduce natural predators, and spray the plant with insecticidal soap.
- Aphids: Aphids are small insects that feed on the plant sap and secrete a sticky substance that attracts other pests. To manage aphids, introduce natural predators, prune infested areas, and use insecticidal soap.
