Overview
Thelypodiopsis divaricata, commonly known as the Sanddune wallflower, is a flowering plant in the mustard family Brassicaceae. It is a small, perennial herbaceous plant that is native to the western United States.
Physical Description
The plant grows up to 20-50 cm tall and bears numerous slender stems that are covered with small, narrow, pointed leaves. The leaves are alternate and often with minutely toothed margins. The flowers are arranged in clusters at the end of the stem and are typically bright yellow in color. They have four petals that are arranged in a cross shape, which is characteristic of plants in the mustard family. The seeds are formed in long, narrow pods that can be up to 5 cm long and hold 30-40 seeds each.
Origin
Thelypodiopsis divaricata is native to the western United States. It is found in the states of California, Nevada, Arizona, Utah, Colorado, Wyoming, and Montana. It typically grows in sandy soils, along with other dune plant species, and can tolerate both extreme heat and cold temperatures.
Common Names
The plant is commonly known as Sanddune wallflower, Divaricate thelypody or False Wallflower. The scientific name, Thelypodiopsis divaricata, comes from Greek words thelys, meaning “female,” pous, meaning “foot,” and opsis, meaning “appearance,” which refer to the flower's appearance resembling a stylized female foot.
Uses
Thelypodiopsis divaricata has no known medicinal or culinary uses. However, it is a popular horticultural plant that is often used in rock gardens and other dry, sandy areas for its distinctive appearance and bright yellow flowers.
Light Requirements
Thelypodiopsis divaricata favors areas with full sunlight exposure. This plant cannot grow in shady locations as it requires sunlight for its growth and development. Exposing it to full sunlight conditions ensures that it will engage in optimal photosynthesis, which is essential for its good growth and development.
Temperature Requirements
This plant species is mostly found thriving in regions with warm climates. It does not do well in extremely cold temperatures and grows best in temperatures ranging between 32 and 75 °F (0 and 24 °C). Above or below these temperatures may lead to stunted growth or weakened plants, making it difficult for Thelypodiopsis divaricata to reach maturity.
Soil Requirements
When planting Thelypodiopsis divaricata, it's best to use well-draining soil with a decent level of fertility. A slightly acidic soil pH ranging between 5.5 and 7.5 would provide optimum growth conditions. This plant requires slightly moist soil at all times for optimal growth, but stagnant water can be harmful to the growth of this species. It's best to avoid waterlogged soils or soils with poor drainage when planting Thelypodiopsis divaricata.
Cultivation methods
Thelypodiopsis divaricata thrives in areas with plenty of sunlight and good drainage. They require good soil preparation because the plant prefers moist soils and loose terrain for root development.
The plant should be planted in early spring, as it will give them enough time to establish their roots before hot weather arrives. Space the plants out by 18-24 inches apart to give them space to grow.
Watering needs
Thelypodiopsis divaricata requires frequent watering, especially during the hot and dry summer months. Make sure the soil does not dry out completely between watering sessions, and avoid overwatering, which can cause root rot.
Proper watering is essential during their first year of growth to help them establish a strong root system. However, once established, the plant can tolerate some periods of drought.
Fertilization
Thelypodiopsis divaricata does not require fertilizer during their first year of growth. After that, they can benefit from a light application of fertilizer in the spring to boost their growth and flowering.
Use a balanced, slow-release fertilizer, and follow the manufacturer's instructions for the recommended amount and application frequency. Avoid applying too much fertilizer, as it can lead to excessive growth and reduced flowering.
Pruning
Thelypodiopsis divaricata typically does not require pruning, but you can remove any dead or damaged parts as needed. This will help to promote healthy growth and flowering.
If the plant becomes too large or overgrown, you can prune it back in the late fall or early spring before new growth emerges. Be sure to use clean and sharp pruning tools to avoid damaging the plant.
Propagation of Thelypodiopsis divaricata
Thelypodiopsis divaricata (Rollins) Welsh & Reveal is commonly known as the Sanddune thelypody and belongs to the Brassicaceae family. This plant grows naturally in areas with coarse-textured soils such as sand dunes, dry sandy plains, and disturbed sites. Propagation of Thelypodiopsis divaricata can be done using different methods, including:
Seed Propagation
Thelypodiopsis divaricata can be propagated by sowing seeds in well-drained soil and kept in a warm place under full sunlight. The best time to plant the seeds is during the fall or early spring. Once the seeds have established, they should be transplanted to individual pots.
Cuttings Propagation
Another way of propagating Thelypodiopsis divaricata is by taking cuttings from mature plants. The cuttings should be taken during the early growth stages, and the parent plant should be watered a few days before taking the cuttings. The cuttings should be dipped in hormone rooting powder and potted in compost-rich soil. The cuttings should then be watered and kept under high humidity areas until they start rooting.
Division Propagation
Thelypodiopsis divaricata can also be propagated by division during the early spring. The plant should be dug up carefully and divided into several sections, each having a well-established root system. The divisions should then be potted in well-draining soil and watered frequently until well established.
Propagation of Thelypodiopsis divaricata is an easy process that can be achieved using seeds, cuttings, or division. With proper care during propagation, the new plants will establish well in the new environment.
Disease Management
Thelypodiopsis divaricata is generally a low-maintenance plant, however, there are some common diseases that can affect it. One of the most common diseases is powdery mildew which causes the leaves to become covered in a white, powdery substance. This disease can be managed by ensuring the plant is not overcrowded and providing good air circulation.
Another common disease that affects Thelypodiopsis divaricata is root rot which is caused by overwatering or poorly drained soil. To prevent this disease, ensure the soil is well-drained and avoid overwatering the plant. If root rot is detected, reduce watering and treat the plant with a fungicide.
Viral diseases can also affect Thelypodiopsis divaricata. These diseases can be transmitted by insects or contaminated equipment. There is no cure for viral diseases, so the best approach is to remove and destroy any infected plants and to use only clean equipment.
Pest Management
Thelypodiopsis divaricata can also be affected by several pests. One of the most common pests is aphids which can cause distorted growth and the yellowing of leaves. Aphids can be managed by spraying the plant with a strong jet of water to remove them or by using insecticidal soap or neem oil.
Another common pest that affects Thelypodiopsis divaricata is the spider mite which causes the leaves to turn yellow and dry out. Spider mites can be managed by spraying the plant with water to increase humidity and using insecticidal soap or neem oil.
Caterpillars and other chewing insects can also affect Thelypodiopsis divaricata. These pests can be managed by handpicking them off the plant or using an organic insecticide.
