Sourwood Tree Plant Care
Oxydendrum arboreum (L.) DC.
Oxydendrum arboreum, commonly known as sourwood or sorrel tree, is the sole species in the genus Oxydendrum, in the family Ericaceae. It is native to eastern North America, from southern Pennsylvania south to northwest Florida and west to southern Illinois; it is most common in the lower chain of the Appalachian Mountains.
Every 7–10 days
Partial shade to full sun
0–90°F
40–70%
What Is the Sourwood Tree?
Sourwood Tree (Oxydendrum arboreum) belongs to the Ericaceae family within the Oxydendrum genus. Sourwood Tree is native to eastern North America, from southern Pennsylvania south to northwest Florida and west to southern Illinois. Sourwood Tree is also known as Sourwood, Sorrel Tree, Lily-of-the-Valley Tree.
Sourwood Tree displays a small deciduous tree growth habit, reaching up to 30 inches tall with a spread of approximately 20 inches. Sourwood Tree produces bell-shaped white flowers in drooping clusters.
Leaf size: approximately 6 inches.
How Often Should You Water a Sourwood Tree?
Oxydendrum arboreum requires watering every 7–10 days. Allow the top layer of soil to dry between waterings to prevent root rot. Reduce watering frequency during winter when growth slows.
Watering Frequency
Every 7–10 days
Let soil partially dry between waterings
What Light Does the Sourwood Tree Need?
Sourwood Tree thrives in partial shade to full sun light conditions. The optimal light range is 1000–3000 lux. Avoid placing Sourwood Tree in direct, harsh sunlight for extended periods, as this can scorch the foliage.
Light Requirement
Partial shade to full sun
1000–3000 lux
What Temperature and Humidity Does the Sourwood Tree Prefer?
Oxydendrum arboreum grows best at temperatures between 0°F and 90°F. Sourwood Tree prefers humidity levels of 40–70%.
Temperature
0–90°F
Humidity
40–70%
What Soil Mix Works Best for a Sourwood Tree?
Moist, acidic, well-draining soil with high organic matter content. Good drainage is essential for Sourwood Tree to prevent waterlogging, which leads to root rot and fungal issues.
How Do You Repot a Sourwood Tree?
Repot every 2-3 years in early spring. Choose a pot one size larger than the current container, and ensure it has drainage holes to allow excess water to escape.
How Do You Propagate a Sourwood Tree?
Sourwood Tree can be propagated through seeds, softwood cuttings.
Fertilizing
Every 8 months
During the growing season
Is the Sourwood Tree Toxic to Pets and Children?
Non-Toxic
Non-toxic to humans and pets
What Pests and Diseases Affect the Sourwood Tree?
Sourwood Tree is susceptible to spider mites, scale insects. Inspect the foliage regularly, especially along leaf undersides and stems. Treat infestations promptly with insecticidal soap or neem oil to prevent spread.
What USDA Hardiness Zone Does the Sourwood Tree Need?
Sourwood Tree grows outdoors in USDA Zone 5a – 9b. Native to eastern North America, from southern Pennsylvania south to northwest Florida and west to southern Illinois, Sourwood Tree is adapted to warm climates. In cooler regions, grow Sourwood Tree as a houseplant or bring it indoors before the first frost.
Hardiness Zone
Zone 5a – 9b
Keep exploring plants
Sourwood Tree is one of many species covered in the complete plant care and identification guide, which groups plants by genus, attribute, and popularity.
It belongs to the Oxydendrum genus — compare its care with other Oxydendrum species on PlantoScan.
Sourwood Tree tolerates low-light rooms and shaded spots — browse the full list of low-light plants.
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