Overview
Erysimum platyspermum (Gray) Kuntze, also known by the common name broadseed wallflower, is a plant species in the family Brassicaceae. This plant is native to the southwestern United States and northern Mexico.
Appearance
Erysimum platyspermum is an erect perennial herb that grows up to 50 cm tall. Its stem is woody at the base, and the upper parts are branched and covered with small hairs. The leaves are narrow and slender, up to 8 cm long, and dark green in color. The flowers are yellow and have four petals, blooming from April to June. After blooming, the plant produces narrow fruits that contain many small seeds.
Uses
Erysimum platyspermum has been used traditionally by Native American tribes for medicinal purposes. It was used to treat coughs, fever, and colds. The leaves and stems were used to make poultices to treat skin problems such as wounds, rashes, and boils. The plant is also grown as an ornamental in gardens for its bright yellow flowers.
In conclusion, Erysimum platyspermum is a unique plant species that is native to the southwestern United States and northern Mexico. It is also known by the common name broadseed wallflower and has been used traditionally for medicinal purposes by Native American tribes. Its distinctive appearance makes it a popular ornamental plant in gardens.
Light Requirements
Erysimum platyspermum (Gray) Kuntze typically grows well in full sunlight but can also tolerate partial shade. It needs about 6 to 8 hours of direct sunlight daily to flourish. If grown in too much shade, the plant may become leggy and less vibrant.
Temperature Requirements
The plant thrives in moderate temperatures ranging between 50°F to 80°F (10°C to 27°C). It is drought-tolerant and can survive in hot and dry conditions, making it an excellent option for arid regions. The plant does not fare well in areas with frost and should be protected if grown in such climatic areas.
Soil Requirements
Erysimum platyspermum grows best in well-draining soils in full sunlight. They prefer sandy or gravelly loam soils with slightly alkaline or neutral pH levels ranging from 6.0 to 7.5. It is crucial to ensure that the soil is sufficiently aerated since the plant may begin to develop root disease in poorly-drained soils.
Cultivation methods
Erysimum platyspermum, commonly known as Gray's wallflower, is a hardy perennial that prefers full sun or partial shade and well-drained soil. It can tolerate dry conditions but requires occasional watering during prolonged droughts. Gray's wallflower is an easy plant to cultivate, and it can be grown from cuttings or seeds. If starting from seeds, sow them in a nursery bed in spring, and transplant them when they grow to a size that can handle in the garden. This plant thrives in USDA hardiness zones 5 to 9.
Watering needs
Gray's wallflower does not require excessive watering, and overwatering can cause root rot or mildew. Water it sparingly, especially during the growing season, and ensure that the soil is well-draining. The plant is drought-resistant, but it appreciates occasional watering during prolonged dry periods, which encourages flowering.
Fertilization
Erysimum platyspermum is not a heavy feeder; however, an annual feeding in spring with a general-purpose fertilizer can improve its growth and flowering. It would help if you fertilized it sparingly during the growing season to avoid encouraging excessive vegetative growth and reduced flowering.
Pruning
Gray's wallflower does not require severe pruning, but it benefits from trimming back after flowering. Cut back the spent flowers to encourage the plant to produce new flowers. Light pruning in the fall can help to maintain a compact shape and prevent legginess. Remove any dead or damaged branches to prevent the spread of diseases.
Propagation of Erysimum platyspermum (Gray) Kuntze
Erysimum platyspermum, also known as Flatseed wallflower, is a perennial herbaceous plant that belongs to the Brassicaceae family. This plant is native to western North America and is commonly found in dry habitats, including deserts and rocky slopes.
Propagation methods:
The propagation methods for Erysimum platyspermum include seed sowing and stem cuttings.
Seed sowing:
Seed sowing is the most common method of propagating Erysimum platyspermum. The seeds of this plant are small and should be sown in a well-draining soil mixture in a seed tray. The tray should be placed in a warm, bright location, and the soil should be kept moist.
After a few weeks, the seeds will germinate and can be transplanted into individual pots. When the seedlings have developed several true leaves, they can be planted into their permanent location.
Stem cuttings:
Propagation by stem cuttings is another method for Erysimum platyspermum, and it is typically used for the production of new plants that are genetically identical to the parent plant. The cuttings should be taken from healthy, mature stems and should be at least 4 inches long.
Remove the leaves from the bottom half of the cutting and dip the cut end in rooting hormone. Plant the cutting in a well-draining potting mix and water it thoroughly. Place the potting mix in a warm, bright location and keep it moist.
After several weeks, the cutting will develop roots and can be transplanted into its permanent location.
Overall, Erysimum platyspermum can be propagated successfully by seed sowing or stem cuttings, depending on the grower's preference and the availability of plant material.
Disease Management
Erysimum platyspermum is susceptible to several diseases, including:
- Clubroot: This fungal disease attacks the roots of the plant, causing stunted growth, yellowing leaves, and wilting. It may also cause the plant to produce small, distorted, and underdeveloped flowers. To manage clubroot, maintain optimal soil moisture levels, reduce soil compaction, and avoid planting susceptible crops in the same area. Applying a fungicide can also be useful to manage clubroot.
- Blackleg: This bacterial disease causes the stems of the plant to rot at the base, leading to wilting and death. To manage blackleg, practice crop rotation, avoid overwatering, and maintain proper plant spacing to improve air circulation. Also, ensure to remove and destroy any infected plant debris and avoid planting Erysimum platyspermum in areas where infected plants were grown before.
- Alternaria blight: This fungal disease causes brown spots on the leaves, stems, and flowers of the plant, leading to rapid defoliation. To manage Alternaria blight, remove and destroy any diseased plant debris, maintain proper plant spacing, and improve air circulation. Additionally, apply a fungicide to prevent further spread of the disease.
Pest Management
Erysimum platyspermum is also prone to infestations from various pests, including:
- Aphids: These small insects can cause serious damage to the plant by sucking sap from the leaves, leading to stunted growth and distorted leaves. To manage aphids, remove the affected parts of the plant, use a strong jet of water to dislodge the insects, and apply insecticidal soap or a neem oil solution.
- Spider mites: These tiny pests cause discoloration and browning of the leaves, leading to defoliation and reduced growth. To manage spider mites, increase humidity levels around the plant, prune affected plant parts, and apply a miticide solution.
- Cabbage loopers: These caterpillars can cause significant damage to the plant by feeding on the leaves, leading to holes and defoliation. To manage cabbage loopers, remove the affected plant parts, handpick the caterpillars, and apply Bacillus thuringiensis (BT) insecticide.
