Contents
Description
Rhododendron Macrophyllum, also known as Pacific Rhododendron or California Rhododendron, is an evergreen shrub that can grow up to 20 feet tall. It belongs to the Ericaceae family and is native to the west coast of North America, from British Columbia to California. The plant produces showy clusters of pink, purple, or white flowers in the spring.
Taxonomic Information
| Domain | Eukaryota |
| Kingdom | Plantae |
| Phylum | Spermatophyta |
| Class | Magnoliopsida |
| Order | Ericales |
| Family | Ericaceae |
| Genus | Rhododendron |
Appearance
Rhododendron Macrophyllum has large, leathery, dark green leaves that can grow up to 8 inches long. The plant produces clusters of 5-20 flowers that are trumpet-shaped and can be up to 2 inches wide. The flowers can be pink, purple, or white, and have a sweet fragrance. The plant blooms in the spring, and the flowers can last up to 3 weeks.
Care Guide
Rhododendron Macrophyllum prefers well-draining, acidic soil with a pH between 4.5 and 5.5. The plant should be watered regularly, but not overwatered, as it can be susceptible to root rot. Fertilize the plant in the spring with a slow-release fertilizer formulated for acid-loving plants. The plant prefers partial shade to full sun and is hardy in USDA zones 6-9.
Common Pests & Diseases
Rhododendron Macrophyllum can be susceptible to pests such as spider mites, thrips, and aphids. Diseases that can affect the plant include powdery mildew, root rot, and phytophthora. To prevent these issues, make sure the plant is in well-draining soil, water it correctly, and keep it pruned to promote good air circulation.
Habitat
Rhododendron Macrophyllum is native to the west coast of North America, from British Columbia to California. It can be found in a variety of habitats, including forests, meadows, and rocky slopes. The plant prefers moist, well-draining soil and partial shade to full sun.
Question and Answer
Q: How often should Rhododendron Macrophyllum be fertilized?
A: Fertilize the plant in the spring with a slow-release fertilizer formulated for acid-loving plants.
Q: What are some common pests that can affect Rhododendron Macrophyllum?
A: Spider mites, thrips, and aphids can all be pests that affect the plant.
Q: What pH does Rhododendron Macrophyllum prefer?
A: The plant prefers well-draining, acidic soil with a pH between 4.5 and 5.5.
Q: What is the hardiness zone for Rhododendron Macrophyllum?
A: The plant is hardy in USDA zones 6-9.
Related Plants
- Rhododendron ‘Nova Zembla’
- Rhododendron ‘PJM’
- Rhododendron ‘Purple Splendor’
- Rhododendron ‘Roseum Elegans’
References
- “Rhododendron Macrophyllum.” Pacific Horticulture Society, https://www.pacifichorticulture.org/articles/rhododendron-macrophyllum/. Accessed 30 March 2021.
- “Rhododendron macrophyllum.” Missouri Botanical Garden, http://www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?kempercode=c300. Accessed 30 March 2021.
- “Rhododendron Macrophyllum.” American Rhododendron Society, https://www.rhododendron.org/macro.htm. Accessed 30 March 2021.
