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Description
Sagina japonica, commonly known as Pearlwort, is a low-growing, mat-forming perennial plant that belongs to the Caryophyllaceae family. It is native to Japan and China but has become naturalized in many parts of the world, including North America, Europe, and Australia. This plant is a popular choice for ground cover in rock gardens, between stepping stones, and in other areas where a low-growing plant is desired. It is also commonly used in bonsai.
Taxonomic Information
| Domain | Eukaryota |
| Kingdom | Plantae |
| Phylum | Spermatophyta |
| Class | Magnoliopsida |
| Order | Caryophyllales |
| Family | Caryophyllaceae |
| Genus | Sagina |
Appearance
Sagina japonica has small, bright green leaves that are arranged in a rosette pattern. The leaves are about 1/4 inch long and are slightly hairy. The plant grows to a height of about 2-3 inches and spreads to form a mat that can reach up to 1 foot in diameter. In the spring and summer, Sagina japonica produces tiny white flowers that are about 1/8 inch in diameter. The flowers have five petals and are borne on short stalks.
Care Guide
Sagina japonica is a relatively low-maintenance plant that is easy to care for. Here are some tips to keep your Pearlwort healthy:
- Water: Sagina japonica likes moist soil but can tolerate some drought. Water the plant regularly, especially during dry spells.
- Fertilization: This plant does not typically require fertilizer. However, you can apply a slow-release fertilizer in the spring if desired.
- Soil: Sagina japonica prefers well-draining soil that is rich in organic matter. It can tolerate a wide range of soil types, including sandy and clay soils.
- Sunlight: Pearlwort prefers partial shade but can tolerate full sun in cooler climates. In hot climates, it should be grown in a shaded area.
- Hardiness Zones: Sagina japonica is hardy in USDA zones 4-9.
Common Pests & Diseases
Sagina japonica is generally not susceptible to many pests or diseases. However, it can be affected by the following:
- Slugs and snails: These pests can damage the leaves and flowers of Sagina japonica. Use slug bait or traps to control them.
- Powdery mildew: This fungal disease can cause a white powdery coating on the leaves of Sagina japonica. To prevent powdery mildew, avoid overwatering and ensure good air circulation around the plant.
Habitat
Sagina japonica is native to Japan and China but has become naturalized in many other parts of the world. It is commonly found in rock gardens, between stepping stones, and in other areas where a low-growing plant is desired. It prefers moist, well-drained soil and partial shade.
Question and Answer
Q: Is Sagina japonica a good plant for bonsai?
A: Yes, Sagina japonica is a popular choice for bonsai because of its small size and low-growing habit.
Q: Can Sagina japonica tolerate full sun?
A: Sagina japonica prefers partial shade but can tolerate full sun in cooler climates. In hot climates, it should be grown in a shaded area.
Q: How often should I water Sagina japonica?
A: Sagina japonica likes moist soil but can tolerate some drought. Water the plant regularly, especially during dry spells.
Q: What is the hardiness zone for Sagina japonica?
A: Sagina japonica is hardy in USDA zones 4-9.
Related Plants
- Sagina subulata
- Sagina pilifera
- Sagina procumbens
References
- “Sagina japonica.” Missouri Botanical Garden. Accessed 28 July 2021. www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?kempercode=c660.
- “Sagina japonica.” Plant Finder. Accessed 28 July 2021. www.monrovia.com/plant-catalog/plants/3247/pearlwort/.
- “Sagina japonica.” Gardenia. Accessed 28 July 2021. www.gardenia.net/plant/sagina-japonica-pearlwort.
