Overview
Thelypodium laciniatum (Hook.) Endl. ex Walp. var. milleflorum (A. Nels.) Payson, commonly known as the Many-flowered thelypody, is a perennial herbaceous plant belonging to the mustard family (Brassicaceae). The herb is native to North America, specifically found in Canada, Alaska, and the western United States. This robust plant is found growing in wet meadows, along streams, and in montane habitats that receive moisture throughout the growing season.
Description
The plant has large basal leaves that are oblong in shape with jagged edges - pinnately lobed, measures up to 25 cm long and 15 cm wide. Several hairy, branching stems rise from the base and grow up to three feet tall. The leaves are green with a purple tint. The flowers are produced in dense terminal clusters with numerous, small, lavender to purple petals. They bloom from May to July.
Uses
The Native Americans used Thelypodium laciniatum for medicinal purposes. It was employed as a painkiller, as well as an antiseptic. The plant was often crushed and applied directly to the skin to treat cuts, burns, and other minor injuries. Thelypodium laciniatum is also an important species for the ecosystems, as it is a food source for various insects, butterflies, and bees. Its showy flowers add a striking contrast to the greenery surrounding it, attracting pollinators.
Cultivation
Thelypodium laciniatum is grown from seed and prefers moist soil in full to partial sun. The plant can tolerate a range of soil types but will grow best in acidic, loamy soils. It is best to give the plant plenty of space as it can reach a significant size. Thelypodium laciniatum is considered relatively easy to cultivate as, once established, it requires little maintenance.
Final Thoughts
The Many-flowered thelypody is a beautiful, low-maintenance addition to North American meadow gardens and natural landscapes. Its lush green foliage and clusters of vibrant purple flowers contribute to a variety of ecosystems, making it an essential plant to consider.
Light Requirements
Thelypodium laciniatum var. milleflorum typically requires full sunlight exposure to complete its life cycle. This plant cannot grow properly in areas with partial or full shade, which will stunt its growth and prevent it from flowering.
Temperature Requirements
The plant Thelypodium laciniatum var. milleflorum is commonly found in arid regions where temperatures can fluctuate greatly. This plant can tolerate intense heat during the day, as long as the temperatures drop at night. It can tolerate temperatures ranging from -28.9 to 46.1 degrees Celsius (-20 to 115 degrees Fahrenheit).
Soil Requirements
The plant Thelypodium laciniatum var. milleflorum requires well-draining soils that are rich in nutrients. This plant can tolerate a wide range of soil pH levels, but it prefers neutral to slightly alkaline soils. This plant can even grow in slightly saline soils, but it cannot survive in waterlogged soils.
Cultivation Methods
Thelypodium laciniatum (Hook.) Endl. ex Walp. var. milleflorum (A. Nels.) Payson is a hardy plant that does well in USDA hardiness zones 4 to 8. It can be grown in full sun to partial shade. The plant prefers well-drained soil but can tolerate a wide range of soil types. It is relatively easy to propagate and can be grown from seeds or cuttings.
Watering Needs
The plant requires regular watering, especially during the growing season. The soil should be kept moist but not waterlogged. Overwatering can lead to root rot, which can be detrimental to the plant's health. It is recommended to water deeply once a week, rather than light watering daily.
Fertilization
A slow-release fertilizer can be added to the soil in the spring and mid-summer to support growth. Alternatively, a liquid fertilizer can be applied bi-weekly during the growing season. It is best to avoid fertilizing during the plant's dormant period.
Pruning
Deadheading spent flowers can encourage more blooms. It is also recommended to cut back the plant in the fall to promote new growth in the spring. However, it is essential to avoid cutting back the plant too much, as Thelypodium laciniatum (Hook.) Endl. ex Walp. var. milleflorum (A. Nels.) Payson can have a woody base.
Propagation of Thelypodium laciniatum var. milleflorum
Thelypodium laciniatum var. milleflorum can be propagated through seeds or cuttings.
Propagation by seeds
The seeds of Thelypodium laciniatum var. milleflorum can be collected from mature plants in the late summer or early fall when the seed pods have ripened and turned brown. The seeds can be sown immediately or stored for later use. Before sowing, the seeds should be stratified for 4-6 weeks to break their dormancy. This can be done by storing the seeds in a plastic bag with a damp paper towel in the refrigerator.
After stratification, the seeds can be sown in a well-draining soil mix and lightly covered with soil. The soil should be kept moist but not waterlogged until the seedlings emerge, which can take several weeks. Once the seedlings have developed true leaves, they can be transplanted into individual containers or into the ground.
Propagation by cuttings
Thelypodium laciniatum var. milleflorum can also be propagated through stem cuttings. This method is best done in the late spring or early summer when the plants are actively growing.
To take cuttings, select a healthy stem and make a clean cut just below a node. Remove the lower leaves from the cutting and dip the end in rooting hormone. Plant the cutting in a well-draining soil mix and keep the soil moist but not waterlogged. Cover the cutting with a plastic bag or cloche to maintain humidity and prevent wilting.
The cutting should root within a few weeks and can be transplanted into its permanent location once it has developed a strong root system.
Disease and Pest Management for Thelypodium laciniatum var. milleflorum
Thelypodium laciniatum var. milleflorum is a tough plant that is generally resistant to diseases and pests, but like any other plant, it can be attacked by pests and can also contract some diseases. Here are some common diseases and pests that can affect the plant.
Common Diseases
One of the common diseases that can affect Thelypodium laciniatum var. milleflorum is the white rust caused by Albugo candida. To manage this disease, ensure that the plant is not exposed to moist environments, and prevent overcrowding of plants. Additionally, remove and destroy any infected plant parts and ensure that the soil is not waterlogged.
Another fungal disease that can affect the plant is the downy mildew caused by Peronospora draba. It is characterized by yellow and white patches on the leaves' upperside and white cottony growth on their underside. To manage downy mildew, remove any infected parts of the plant and ensure proper air circulation.
Common Pests
Thelypodium laciniatum var. milleflorum can also be attacked by some pests such as aphids, flea beetles, and spider mites. Aphids are small, green insects that can be found in clusters on the leaves' undersides. To manage them, blast the plant with water and use insecticidal soap. Flea beetles create small holes on the leaves' upper surface, and to manage them, use floating row covers and use insecticides that contain carbaryl or bifenthrin. Spider mites can cause leaf mottling, yellowing, and drying. They are usually found on the leaves' undersides and to manage them, use miticidal soap.
Thelypodium laciniatum var. milleflorum is a beautiful and low-maintenance plant that can withstand all kinds of weather conditions. However, it is important to monitor the plant regularly for any signs of disease and pests, and to act quickly in managing them.
