Origin and Common Names
Diapensia lapponica L. var. obovata F. Schmidt is a small, creeping evergreen plant that is native to arctic and alpine regions of Europe, Asia, and North America. It is commonly known as Lapland diapensia or mountain sandwort.
Appearance
This plant has a low growth habit and forms compact mats, no taller than 5 cm. The leaves of Lapland diapensia are small, obovate and can be similar to a teaspoon in shape. Each leaf is only around 3-4 mm long and is packed tightly along the stem. It has hairy and fleshy stems, which give the plant a silvery appearance. The flowers are white or pink and held in small clusters at the tips of the stems. The flowers bloom in late spring to early summer.
Uses
Lapland diapensia has no significant medicinal uses but is an excellent ornamental plant for rock gardens, alpine gardens, and crevices. The plant is often used to create ground covers, typically found in alpine landscapes. This plant is a great choice for colder regions or those with a short growing season as it can tolerate frost, and it is relatively easy to grow. Lapland diapensia prefers moist, porous, well-drained soils with a neutral pH and requires full sun to partial shade.
Light Requirements
Diapensia lapponica L. var. obovata F. Schmidt plants require high levels of light to thrive. It is recommended to place them in areas where they can receive full sunlight for at least 6 hours per day. Insufficient light may lead to weak and spindly growth, as well as inadequate flower production.
Temperature Requirements
These plants are adapted to survive in cold climates and can withstand freezing temperatures. However, they require a cool environment to grow optimally. The ideal temperature range for Diapensia lapponica L. var. obovata F. Schmidt plants is between 40 to 60°F (4.4 to 15.5°C). In warmer climates, it is best to plant them in areas with partial shade to prevent overheating.
Soil Requirements
The soil for Diapensia lapponica L. var. obovata F. Schmidt should be well-drained and have excellent air circulation. The ideal soil pH range is between 5.0 to 6.5. The soil must be rich in organic matter and must maintain a consistent moisture level. These plants do not tolerate waterlogged soils or soils with poor drainage. It is recommended to amend the soil with compost or peat moss to improve organic matter content and drainage. Additionally, these plants are adapted to grow in rocky and gravelly soils, which provide excellent drainage and air circulation to the roots.
Cultivation methods
The Diapensia lapponica L. var. obovata F. Schmidt is a slow-growing alpine plant that requires special attention to its cultivation. It thrives in well-drained, rocky or sandy soil that is slightly acidic. Choose a spot that is protected from the hot sun and strong winds, and preferably one that has a cool, moist environment.
In a garden, plant the Diapensia lapponica L. var. obovata F. Schmidt in raised beds. Ensure the soil is loose and well-drained. Plant the seeds at a depth of 1/8 inch. Keep the soil consistently moist. The best time to plant the seeds is in early spring or fall.
Watering needs
Water the Diapensia lapponica L. var. obovata F. Schmidt regularly to keep the soil consistently moist. However, it is essential to avoid overwatering as this alpine plant does not tolerate standing water. If the soil is not well-drained, the plant's roots will rot, and it will eventually die. In the winter, reduce watering to prevent waterlogging in the soil.
Fertilization
The Diapensia lapponica L. var. obovata F. Schmidt does not require regular fertilization. Applying a slow-release fertilizer in the spring will provide the plant with the necessary nutrients to support healthy growth. After applying fertilizer, water the plant thoroughly but avoid getting moisture on the foliage as it can cause disease.
Pruning
Pruning is not required for the Diapensia lapponica L. var. obovata F. Schmidt. However, removing any diseased or dead foliage will help prevent the spread of disease and pests. Additionally, cutting back the plant after flowering can encourage new growth and maintain a compact shape.
Propagation of Diapensia lapponica L. var. obovata F. Schmidt
Diapensia lapponica L. var. obovata F. Schmidt is a small, slow-growing arctic-alpine plant that belongs to the family Diapensiaceae. It is a quite challenging plant to propagate, and it requires a lot of patience and care.
Propagation Methods
The most common propagation methods for Diapensia lapponica L. var. obovata F. Schmidt include seed propagation and vegetative propagation.
Seed Propagation
Seeds of Diapensia lapponica L. var. obovata F. Schmidt require stratification for successful germination. The seeds need to be stratified at a temperature of 4°C to 10°C for about two to three months. After stratification, seeds can be sown in a well-draining fertile soil mix. The soil should be kept moist but not waterlogged. Germination can take up to six weeks, and it may take several years for the plant to reach maturity.
Vegetative Propagation
Vegetative propagation of Diapensia lapponica L. var. obovata F. Schmidt is more challenging than seed propagation. The plant can be propagated through division or cuttings.
Division involves separating the plant into smaller sections, each with roots and shoots. The sections are replanted in a well-draining fertile soil mix and kept moist until new growth appears.
Cuttings can be taken in the spring, and they should be about 5cm long with several leaves. The cuttings should be inserted into a well-draining sterile growing medium. The medium should be moist and kept in a warm and bright place. Rooting can take from six to twelve weeks, and the new plants should be transplanted into bigger pots once they have established roots.
Disease and Pest Management for Diapensia lapponica L. var. obovata F. Schmidt
Diapensia lapponica L. var. obovata F. Schmidt is a cold-hardy alpine plant primarily found in regions with low temperatures, such as the Arctic and mountainous areas. However, like any other plant, it is susceptible to diseases and pests. Here are some of the common diseases and pests that might affect this plant, along with suggested ways to manage them.
Common Diseases
Pythium root rot: This is a soil-borne disease caused by a fungus called Pythium spp. It can attack the roots of the plant, causing them to decay. Symptoms of this disease include wilting, yellowing, and stunting of the plant. To manage this disease, avoid overwatering, remove infected plants and soil, and use sterilized soil when replanting.
Mildew: Mildew is a fungal disease that affects the leaves and stems of the plant. It is caused by high humidity or moisture on the plant's surface. Symptoms of mildew include a white powdery substance on the plant's surface. To manage mildew, maintain good air circulation, avoid watering in the evening, and use fungicides as recommended.
Common Pests
Aphids: Aphids are small, soft-bodied insects that feed on the plant's sap. They can cause the plant to wilt, yellow, and stunt. To manage aphids, prune infested plants, use insecticidal soap, and increase natural predators.
Spider mites: Spider mites are tiny pests that feed on the plant's sap, causing it to dry out and turn brown. They can also spin webs on the plant's surface. To manage spider mites, use insecticidal soap, prune infested plants, and increase natural predators.
By taking proactive measures to manage diseases and pests, you can help protect your Diapensia lapponica L. var. obovata F. Schmidt plant. Remember to always follow the recommended guidelines for the use of pesticides and fungicides, and to use them only as a last resort.
