Origin
Ceanothus greggii Gray var. orbiculatus E.H. Kelso, commonly known as round-leaved ceanothus, is a small evergreen shrub species indigenous to the Southwest United States and Mexico. It is commonly found in dry, rocky soil areas from California to Texas, and southward to Querétaro, Mexico.
Common Names
Aside from its scientific name, Ceanothus greggii Gray var. orbiculatus E.H. Kelso, this plant species is commonly known as Round-leaved ceanothus, Desert ceanothus, and Gregg's wild lilac.
Uses
This plant species is a popular choice for ornamental planting, its splendid blue-purple flowers and attractive round leaves making it a valuable addition to any garden. The plant can function as an accent, massing, or hedge plant, depending on the landscaper's needs. Medical practitioners also utilize Round-leaved ceanothus for the essential oils stored in its leaves, as well as the bark and roots, which are famed for their anti-inflammatory, expectorant and antispasmodic properties.
General Appearance
Ceanothus greggii Gray var. orbiculatus E.H. Kelso grows to an average height of 1-3 feet tall. It bears glossy, round leaves of 2.5cm - 4cm, which are dark, formal green on top, while underneath, they assume an olive hue. Round-leaved ceanothus produces a wealth of flower clusters up to 10cm long, and 2.5-5cm wide, each composed of tiny pale blue-purple flowers that emit an aroma of honey. The plant's fruit resembles a small, egg-shaped nutlet, about 2-4mm in diameter, and is dark brown/black in color.
Growth Conditions for Ceanothus greggii Gray var. orbiculatus E.H. Kelso
Ceanothus greggii Gray var. orbiculatus E.H. Kelso is a drought-tolerant shrub that is native to arid regions of Arizona. The plant's typical growth conditions include:
Light Requirements
This plant thrives in full sun and tolerates partial shade. It requires at least six hours of direct sunlight per day to grow properly and to ensure heavy blooming. In areas with hot summers, shading the plant during peak afternoon hours can help prevent heat stress.
Temperature
Ceanothus greggii Gray var. orbiculatus E.H. Kelso can tolerate a wide range of temperatures but prefers a warm climate. The plant's minimum temperature tolerance is 15 degrees Fahrenheit. However, plants growing in cold regions must be protected with a thick layer of mulch in winter to protect them from frost and wind.
Soil Requirements
This plant prefers well-draining soils that are slightly acidic with a pH ranging from 6.0 to 7.5. Ceanothus greggii Gray var. orbiculatus E.H. Kelso can grow in a variety of soil types such as sandy, loamy, and clay soils with good moisture retention. The plant can tolerate poor quality soils and can also adapt to soils with low fertility levels. However, it is essential to ensure proper drainage to avoid waterlogging and soil compaction.
Moreover, this plant requires minimal watering once established. Overwatering can cause root rot and subsequent plant death.
Cultivation Methods
Ceanothus greggii Gray var. orbiculatus E.H. Kelso is a versatile plant that can thrive in various soils and climatic conditions. However, it does best in well-drained soils and sunny locations. It can also grow in partial shade, but it may compromise flowering. It is essential to prepare the planting site by digging a hole twice as wide and deep as the container. Mix one part compost with two parts of soil before planting. Ensure that you plant the root ball at the same depth as it was in the container, and water thoroughly after planting.
Watering Needs
Watering is crucial for the successful growth and development of Ceanothus greggii Gray var. orbiculatus E.H. Kelso. Young plants require more water than mature ones, but they are susceptible to root rot and other diseases caused by overwatering. It is advisable to water deeply but infrequently to allow the soil to dry moderately before the next watering. Water the plant once every week during the growing season, and reduce watering during the dormant period to prevent waterlogging and other water-related problems.
Fertilization
Ceanothus greggii Gray var. orbiculatus E.H. Kelso is a low-maintenance plant that does not require heavy fertilization. However, you can provide it with some nutrients to boost its growth and flowering. Apply a slow-release fertilizer with low nitrogen levels in spring before new growth appears. Alternatively, you can use a complete fertilizer with an N-P-K ratio of 10-10-10 or 5-10-10. Apply the fertilizer according to the manufacturer's instructions and water thoroughly after application.
Pruning
Pruning is necessary to maintain the shape and size of Ceanothus greggii Gray var. orbiculatus E.H. Kelso. It is best to prune in late spring or early summer after the flowering period. Remove dead, diseased, or damaged branches first, and then selectively remove overgrown or leggy stems. Cut back the branches to a healthy bud or side shoot, and avoid cutting into old wood as it may deter new growth. You can also lightly prune during the growing season to encourage bushiness and a more compact form.
Propagation of Ceanothus greggii Gray var. orbiculatus E.H. Kelso
Ceanothus greggii Gray var. orbiculatus E.H. Kelso, commonly known as round-leaved ceanothus, is a beautiful and low-growing evergreen shrub that produces clusters of blue flowers in the spring. This plant can be propagated using several methods including seed propagation, cutting propagation, and layering propagation.
Seed Propagation
Seed propagation is an easy and effective method for propagating Ceanothus greggii Gray var. orbiculatus E.H. Kelso. The seeds should be collected from ripe fruit in the fall, dried, and stored until the next planting season. In the spring, the seeds should be planted just below the soil surface, kept moist, and placed in a warm location. Germination should occur within two to three weeks.
Cutting Propagation
Cutting propagation is another popular method for propagating Ceanothus greggii Gray var. orbiculatus E.H. Kelso. In the summer, semi-hardwood cuttings should be taken from the current year’s growth. The cuttings should be taken from the tips of the branches, have at least two nodes, and be approximately 4-6 inches long. Remove the lower leaves and dip the cuttings in rooting hormone before planting them in a moist rooting medium. The cuttings should be kept warm and moist until they establish roots, which typically occurs in 4-6 weeks.
Layering Propagation
Layering propagation is a simple and effective method for propagating Ceanothus greggii Gray var. orbiculatus E.H. Kelso. In the early spring, select a low branch that is flexible and has not yet produced any flowers. Gently bend the branch to the ground and make a small wound in the bark where it touches the soil. Pin the branch to the soil with a small stake and cover the wound with soil. Keep the soil moist and wait for the roots to establish, which typically occurs in 6-12 months. Once the roots are established, cut the branch from the parent plant and transplant it to a new location.
Disease Management
Ceanothus greggii Gray var. orbiculatus E.H. Kelso is generally a healthy and disease-resistant plant. However, some diseases may affect the plant, and early diagnosis and management can save the plant from severe damage.
The most common and challenging disease that can potentially affect Ceanothus greggii is the fungal disease called Ceanothus leaf spot. It initially appears as dark brown spots on the leaves, which later develop into large necrotic patches. The disease can spread rapidly, defoliating the entire plant. To prevent this disease, remove and destroy fallen leaves and debris that can harbor fungal spores. Fungicides containing mancozeb, copper, or chlorothalonil can also be useful in controlling the spread of the fungus.
Another fungal disease that may affect Ceanothus greggii is powdery mildew. It appears as a white powdery coating on the leaves and stems, causing them to curl and distort. The best way to prevent powdery mildew is by providing adequate air circulation, avoiding overhead watering, and planting the shrub in a location with plenty of light. Fungicides containing myclobutanil, triforine, or potassium bicarbonate can be effective in managing the disease.
Pest Management
Ceanothus greggii may attract some pests, but they are mostly easy to manage. The following are some common pests that may affect the plant and ways to deal with them:
Spider mites – These tiny pests suck the sap from the leaves, causing them to appear yellowish and stippled. The mites can be managed by spraying the plant with a strong jet of water to dislodge them. Insecticidal soaps or horticultural oils can also be used to control them.
Scale insects – These small, immobile insects attach themselves to the leaves and branches, feeding on the sap. They secrete a sticky substance called honeydew, which can attract ants and sooty mold. Prune off heavily infested branches and apply horticultural oil to suffocate the insects.
Ceanothus mealybugs – These insects are covered in white, fluffy wax and also suck the sap from the plant. They can be managed by pruning off affected parts or by spray applications of insecticidal soap.
Regular inspection of the plant can help keep pests and diseases under control. Prompt identification and treatment of any problems that arise can prevent them from becoming severe.
