Overview
Dalea wislizeni Gray ssp. sessilis (Gray) H.C. Gentry, also known as the Purple Prairie Clover, is a perennial herb native to North America. It is part of the Fabaceae family, which includes beans, peas, and lentils, and is commonly found in the grasslands, meadows, and prairies of the United States and northern Mexico.
Common Names
In addition to Purple Prairie Clover, Dalea wislizeni Gray ssp. sessilis is also known by other common names, including Cloak Dalea, Tucson Dalea, and Sessile Prairie Clover.
Appearance
The plant typically grows to a height of one to three feet and has a spread of one to two feet. Its leaves are compound with three leaflets that are oblong or elliptic in shape and often have a bluish-green tint. The plant produces long spikes of small purple flowers that bloom from June to August. These flowers can attract butterflies, bees, and other insects.
Uses
Dalea wislizeni Gray ssp. sessilis has a few known uses. It is often used in native plant landscapes, restoration projects, and as an ornamental plant for its beautiful purple flowers. Additionally, the plant's roots have been used by some Native American tribes to treat various ailments, including toothaches and menstrual cramps, and its leaves have been used to make a tea with medicinal properties.
Light Requirements
Dalea wislizeni Gray ssp. sessilis (Gray) H.C. Gentry prefers full sunlight and can tolerate partial shade. It is commonly found growing in open grasslands and desert scrub habitats with plenty of sunlight exposure.
Temperature Requirements
The plant can tolerate both extreme heat and cold temperatures. It is well-adapted to arid environments and can withstand temperatures ranging from below freezing in the winter to above 100°F in the summer.
Soil Requirements
Dalea wislizeni Gray ssp. sessilis (Gray) H.C. Gentry can grow in many types of soils, including sandy, loamy, or clay soils. It prefers well-draining soils and can tolerate drought conditions once established.
However, it does not do well in soils with high salinity or soils that are waterlogged. The plant prefers a slightly alkaline soil pH range of 7.0 to 8.5.
Cultivation
Dalea wislizeni Gray ssp. sessilis (Gray) H.C. Gentry, commonly known as White Prairie Clover, grows well in well-drained soils in dry to mesic conditions. It is adapted to a wide range of soil types, including sandy, loamy, and rocky terrains.
Spring and early summer are the best times to plant White Prairie Clover when the soil temperature reaches around 10°C. Choose a location with full sun exposure and make sure the soil is weed and debris-free.
Watering Needs
White Prairie Clover is a drought-tolerant plant and requires minimal watering once established. However, newly planted seedlings require frequent watering until they establish their roots.
Water the plants at the base, avoiding the foliage, and allow the soil to dry completely between watering sessions.
Fertilization
White Prairie Clover doesn't require much fertilization, but applying a slow-release fertilizer with low nitrogen content during the growing season can improve plant growth and development.
Avoid using fertilizers with high nitrogen levels and phosphorus, as this can lead to leggy or stunted growth, and harm the plant. Organic fertilizers are preferred as they provide long-term benefits to the soil and plant.
Pruning
White Prairie Clover requires minimal pruning, except for removing dead shoots or diseased branches. Prune the plant in late winter or early spring before the new growth emerges.
Pinching the tip of the growing stems during early summer can help promote lateral growth and improve the plant's overall appearance and density.
Propagation of Dalea wislizeni Gray ssp. sessilis (Gray) H.C. Gentry
Dalea wislizeni Gray ssp. sessilis (Gray) H.C. Gentry, commonly known as the Dwarf Prairie Clover, is a herbaceous perennial plant native to the United States. It grows well in sunny upland meadows and prairies and is known for its beautiful pink-purple flowers. The plant can be propagated through different means.
Seed Propagation
The most common method used to propagate Dalea wislizeni is through seed propagation. Seeds can be sown in the spring, directly in the soil or in pots filled with a well-draining potting mix. The seeds must be carefully placed in the soil, making sure they are not buried too deep, and watered well. The seeds will germinate within a few days, and the young plants will grow quickly.
Division Propagation
Dalea wislizeni can also be propagated through division. This method involves separating the root clumps of an established plant. To do this, carefully dig up the plant, ensuring you do not damage the roots. Separate the root clumps using a sharp and sterile garden tool. Replant the divisions in a well-draining soil mix and water well. This method is best done in the fall.
Cutting Propagation
Note: Cutting propagation is not typically recommended for Dalea wislizeni and is rarely used.
Cutting propagation involves rooting cuttings from the parent plant. This method is not very successful for Dalea wislizeni because the plant tends to grow slowly, and cuttings do not form roots well. If you choose to try this method, take cuttings from new growth, and make sure the cutting is at least three inches long. The cuttings should be dipped into a rooting hormone and planted in a well-draining soil mix. Keep the soil moist and in a shaded area until the cutting forms roots.
Disease Management
One of the common diseases that can affect Dalea wislizeni Gray ssp. sessilis (Gray) H.C. Gentry plant is the powdery mildew. It causes white, powdery spots on the leaves, and might lead to leaf loss and stunted growth. To manage this disease, it is advisable to practice good sanitation by removing the affected plant parts and keeping the surrounding area clean. Additionally, applying fungicides such as neem oil or sulfur can help control the powdery mildew.
Fungal leaf spots can also affect Dalea wislizeni Gray ssp. sessilis (Gray) H.C. Gentry causing yellow or brown spots on the leaves. To manage this disease, remove the affected plant leaves, avoid overhead watering, and promote good air circulation. If the disease persists, applying fungicides can help prevent further spread.
Pest Management
The plant can also be affected by various pests like the spider mites and aphids. Spider mites suck on the plant sap leading to yellowing and browning of leaves. They also cause the formation of webbing, especially on the lower part of the plant. To control spider mites, you can use insecticidal soap or neem oil. A strong jet of water can also help dislodge the pests.
Aphids, on the other hand, suck plant sap and can cause stunted growth and distorted leaves. They also excrete honeydew that attracts ants and can lead to the growth of sooty mold. To get rid of aphids, use insecticidal soap, neem oil, or a strong jet of water to dislodge them. It is also advisable to encourage the presence of natural predators like ladybugs.
