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Description
Rhododendron Obtusum, also known as the Korean Rhododendron or the Azalea, is a shrub that produces stunning blooms in shades of pink, red, and purple. Native to Korea and Japan, it was first introduced to the Western world in the late 1800s and has since become a popular ornamental plant.
Taxonomic Information
| Domain | Eukaryota |
| Kingdom | Plantae |
| Phylum | Spermatophyta |
| Class | Magnoliopsida |
| Order | Ericales |
| Family | Ericaceae |
| Genus | Rhododendron |
Appearance
Rhododendron Obtusum grows up to 5 feet tall and wide, with dense foliage that remains evergreen in mild climates. Its leaves are dark green and glossy, and its vibrant flowers bloom in mid to late spring. The blooms are funnel-shaped and can be single or double, with a diameter of up to 2 inches.
Care Guide
Water: Rhododendron Obtusum needs regular watering, especially during hot and dry weather. However, it is important to avoid overwatering, as this can lead to root rot.
Fertilization: Fertilize Rhododendron Obtusum in early spring with a slow-release, acid-based fertilizer. Avoid using fertilizers that contain high levels of nitrogen, as this can damage the plant.
Soil: Rhododendron Obtusum prefers acidic, well-draining soil. If your soil is not naturally acidic, you can amend it with peat moss, pine needles, or other organic matter.
Sunlight: Rhododendron Obtusum prefers partial shade, especially in hot climates. Avoid planting it in full sun, as this can scorch the leaves and flowers.
Hardiness Zones: Rhododendron Obtusum is hardy in zones 5-9.
Common Pests & Diseases
Rhododendron Obtusum is susceptible to a number of pests and diseases, including lace bugs, spider mites, and powdery mildew. To prevent these issues, keep the plant well-watered and fertilized, and prune away any damaged or diseased foliage.
Habitat
Rhododendron Obtusum is native to Korea and Japan, where it grows in woodland areas and along streams and rivers. It prefers moist, acidic soil and partial shade.
Question and Answer
Q: What is the best time to plant Rhododendron Obtusum?
A: The best time to plant Rhododendron Obtusum is in the fall, so it has time to establish its roots before the hot summer weather arrives.
Q: Can Rhododendron Obtusum tolerate full sun?
A: No, Rhododendron Obtusum prefers partial shade and can suffer from leaf scorch if planted in full sun.
Q: How often should I fertilize Rhododendron Obtusum?
A: Fertilize Rhododendron Obtusum once a year, in early spring, with a slow-release, acid-based fertilizer.
Q: How can I prevent powdery mildew on my Rhododendron Obtusum?
A: To prevent powdery mildew, keep the plant well-watered and fertilized, and prune away any damaged or diseased foliage.
Related Plants
- Rhododendron ‘PJM’
- Rhododendron ‘Nova Zembla’
- Rhododendron ‘Roseum Elegans’
- Rhododendron ‘Cunningham’s White’
References
- “Rhododendron obtusum” Missouri Botanical Garden. https://www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?taxonid=287982
- “Rhododendron obtusum.” Royal Horticultural Society. https://www.rhs.org.uk/Plants/13038/Rhododendron-obtusum/Details
- “Rhododendron obtusum.” North Carolina State University. https://plants.ces.ncsu.edu/plants/rhododendron-obtusum/
