Overview
The Sedum obtusatum Gray ssp. boreale Clausen is a popular succulent plant known for its hardiness, adaptability, and attractive appearance. It is a native of North America and is commonly found in the northern regions of the continent.
Common Names
The Sedum obtusatum Gray ssp. boreale Clausen is known by several common names, including Stonecrop, Thrift Stonecrop, and Two-row Stonecrop. The plant is also known by its scientific name, Sedum obtusatum Gray ssp. boreale Clausen.
Appearance
The Sedum obtusatum Gray ssp. boreale Clausen is a small, low-growing succulent plant that typically grows to a height of 6-8 inches. The plant has thick, fleshy leaves that are arranged in a rosette pattern and have a distinctive rounded shape. The leaves are a greenish-grey color and have a slightly powdery texture.
The Sedum obtusatum Gray ssp. boreale Clausen produces small, star-shaped flowers that grow in clusters at the end of long stems. The flowers are typically pink or white in color and bloom in early summer. The plant is a popular choice for rock gardens and is a favorite of gardeners who appreciate its attractive appearance and ease of care.
Uses
The Sedum obtusatum Gray ssp. boreale Clausen is a versatile plant that is well-suited to a variety of growing conditions. It is commonly used in rock gardens, border plantings, and as a groundcover. The plant is also a popular choice for containers and can be grown indoors or outdoors.
The Sedum obtusatum Gray ssp. boreale Clausen is valued for its hardiness and adaptability. The plant is tolerant of drought and is able to thrive in poor soil conditions. It also attracts pollinators such as bees and butterflies, making it a popular choice for gardeners who want to encourage biodiversity in their gardens.
Light Requirements
Sedum obtusatum Gray ssp. boreale Clausen can generally tolerate a range of light intensities. However, it prefers a bright, full sun to partial shade exposure. A lack of adequate sunlight can cause the plant to become leggy and susceptible to diseases.
Temperature Requirements
The plant is hardy and can cope with extreme weather changes. It can survive in zones 5 to 9 of the USDA hardiness map. The ideal temperature for growth is between 60 and 80 degrees Fahrenheit. In winter, the plant can tolerate freezing temperatures and goes dormant during this period. However, frost heave can be severe in areas with little snow coverage, causing damage to the roots.
Soil Requirements
The plant requires well-draining, infertile soil, and it can grow in a variety of soils, including sandy, gravelly, and clay soils. The soil pH should be neutral to slightly alkaline, with a range between 6.5 and 7.5. An excess of organic matter or nutrients can cause the plant to become leggy and detract from its aesthetic qualities.
Cultivation
Sedum obtusatum Gray ssp. boreale Clausen is a hardy plant that is relatively easy to grow. It is best planted in well-draining soil as it is drought-tolerant and sensitive to root rot. Plant it in an area with full sun to partial shade, although it does prefer more sun than shade.
When planting Sedum obtusatum Gray ssp. boreale Clausen, make sure to space them about 6 to 12 inches apart to allow ample growing space. It is a slow-growing plant and may take some time before it reaches its mature size.
Watering Needs
Sedum obtusatum Gray ssp. boreale Clausen is drought-tolerant and can survive long periods without water. However, it is important to establish a regular watering schedule during the first few weeks of planting to help the plant establish its roots fully. After the establishment period, it is best to water sparingly, allowing the soil to dry out before watering again.
Water the plant from the base and avoid getting water on the leaves or stem as this may cause rot or disease. During hot and dry weather, it is advisable to water more frequently to prevent the plant from drying out.
Fertilization
Sedum obtusatum Gray ssp. boreale Clausen is a low-maintenance plant that does not require frequent fertilization. Fertilization can be done during spring or early summer using a slow-release fertilizer specifically designed for succulent plants.
Apply the fertilizer according to the instructions on the packaging, making sure not to over-fertilize as this may cause problems for the plant. It is best to apply fertilizer sparingly, as the plant can thrive without it.
Pruning
Sedum obtusatum Gray ssp. boreale Clausen is a slow-growing plant and does not require frequent pruning. However, it may benefit from occasional pruning to control its size and shape. Pruning can be carried out during the spring or early summer.
To prune the plant, use sterile pruning shears and cut back the stems to the desired length. It is advisable to prune only the tips of the stems, as cutting back too much may cause the plant to lose its shape or become leggy. After pruning, be sure to remove any dead or diseased leaves or stems to prevent the spread of disease.
Propagation methods
The Sedum obtusatum Gray ssp. boreale Clausen, commonly known as Sierra stonecrop, can be propagated by different ways. Below are the different propagation methods:
Seed propagation
Propagation of Sierra stonecrop can be achieved by planting seeds. The seeds should be sown on moist, well-drained soil in spring. Sierra stonecrop seeds are small and require light to germinate. To increase the success of germination, it's recommended to cover them lightly with soil. The seeds take approximately one to three weeks to germinate, depending on the growing conditions.
Vegetative propagation
Another method of propagating Sierra stonecrop is through vegetative propagation, which involves using cuttings or offsets. Cuttings should be taken during summer or early autumn when the plant is actively growing. Select non-flowering stems and cut them just below the leaf node. Remove the lower leaves leaving only the top few leaves. The cuttings should be inserted into a well-draining soil mix and kept moist. The cuttings should root within a few weeks.
Offsets can also be used to propagate Sierra stonecrop. These are small plantlets that grow at the base of the main stem. Gently separate these from the parent plant, removing any excess roots or foliage. Plant these offsets in moist, well-draining soil and keep them in a bright location. Water the newly planted offsets regularly but sparingly. The plant should root and begin to produce new growth in a few weeks.
Disease Management:
Sedum obtusatum ssp. boreale is a relatively disease-resistant plant. However, it can still suffer from some fungal and bacterial diseases. The most common diseases that affect this plant are:
- Leaf Spot: This is a fungal disease that causes brown or black spots on the leaves. It can be caused by different species of fungi, and it can spread quickly in wet conditions. To manage this disease, it is important to remove and destroy all infected leaves. Additionally, it may be necessary to apply a fungicide to prevent the spread of the disease.
- Crown Rot: This is a fungal disease that affects the base of the plant, causing it to rot and eventually die. It is usually caused by overwatering or poor drainage. To manage this disease, it is important to improve drainage and avoid overwatering. Remove the affected plant and its soil, and replant with fresh soil.
Pest Management:
Sedum obtusatum ssp. boreale is also relatively pest-resistant. However, some insects can still damage the plant. Here are the most common pests that affect this plant:
- Aphids: These small insects suck sap from the leaves, causing them to yellow and deform. They can also spread diseases. To manage this pest, remove them manually or use insecticidal soap or neem oil.
- Slugs and Snails: These pests can eat the leaves and young stems of the plant. To manage this pest, you can use a slug and snail bait or create physical barriers, such as copper strips around the plant.
