Oldhamii Bamboo (Bambusa oldhamii): A Comprehensive Guide Overview Oldham's bamboo grows to 55 feet with 4 inch culms and is cold hardy to 20 degrees. Oldhamii makes a spectacular tall windbreak or a focal point specimen. It’s culms are very straight and erect and often used in furniture and construction. The new shoots of Oldhamii are also edible! Common Names Oldhamii Bamboo Giant Timber Bamboo Oldham's Bamboo Average Height and Diameter Height: Typically reaches between 40 to 60 feet (12 to 18 meters) at maturity, making it one of the tallest clumping bamboos available. Culm Diameter: Culms (canes) are thick and sturdy, usually measuring 3 to 4 inches (7.5 to 10 centimeters) in diameter. Growth Rate Oldhamii Bamboo is known for its rapid growth rate, especially in warmer climates. This bamboo can reach its full height within just a few years, producing new shoots that grow rapidly during the growing season. As a clumping bamboo, it forms tight, non-invasive clusters, making it easier to manage in both small and large landscapes. Sun Requirements Optimal Exposure: Thrives in full sun to partial shade. Details: Oldhamii Bamboo performs best in full sun, where it receives at least 6 to 8 hours of direct sunlight daily. It can also tolerate partial shade, but the growth rate and overall height may be slightly reduced in shadier conditions. Cold Hardiness USDA Hardiness Zones: 8b through 11. Temperature Tolerance: Oldhamii Bamboo is relatively cold-hardy for a tropical bamboo, withstanding temperatures as low as 20F (-6°C). In USDA Zone 8b, where temperatures occasionally dip lower, some leaf damage might occur, but the bamboo typically recovers well in the spring. Water Requirements General Needs: Prefers consistently moist soil but can tolerate brief periods of drought once established. Watering Schedule: Establishment Phase: Water deeply 2-3 times per week, ensuring the soil remains moist but not waterlogged. Established Plants: Water once a week or during extended dry periods. Allow the top inch of soil to dry out between waterings. Drainage: Ensure soil has good drainage to prevent waterlogged conditions, which can lead to root rot. Detailed Fertilizing Guide Frequency: Fertilize three times per year — in early spring, mid-summer, and early fall. Type of Fertilizer: Balanced Fertilizer: Use a balanced, slow-release granular fertilizer with an N-P-K ratio of 10-10-10. High-Nitrogen Fertilizer: For more vigorous growth, consider using a high-nitrogen fertilizer (e.g., 20-5-10) to promote lush foliage and rapid shoot development. Application Steps: Measurement: Follow the manufacturer's guidelines, typically applying 1 to 2 pounds of fertilizer per 100 square feet of planting area. Distribution: Spread the fertilizer evenly around the base of the bamboo, extending out to the drip line (the outer edge of the bamboo's canopy). Incorporation: Lightly rake the fertilizer into the topsoil to ensure proper absorption. Watering: Water thoroughly after application to help dissolve and activate the fertilizer, allowing it to reach the root zone. Organic Alternatives: Compost: Incorporate well-rotted compost annually to improve soil fertility and structure. Manure: Aged manure can also be applied as an organic fertilizer, enriching the soil with essential nutrients. Planting Guide Site Selection: Sunlight: Choose a location with full sun to partial shade. Space: Ensure ample space for the bamboo to spread, considering its mature height and width. Soil Preparation: Soil Type: Prefers well-draining, loamy soil enriched with organic matter. pH Level: Ideal soil pH ranges from 6.0 to 6.5. Planting Steps: Digging the Hole: Dig a hole twice the width and the same depth as the root ball. Positioning: Place the bamboo in the hole, ensuring the top of the root ball is level with or slightly above the surrounding soil. Backfilling: Refill the hole with native soil mixed with compost or aged manure. Watering: Water thoroughly to help settle the soil and eliminate air pockets. Spacing: Hedges or Screens: Plant 8 to 10 feet apart for a dense, effective barrier. Specimen Planting: Allow 10 to 15 feet between plants to showcase their full growth potential. Mulching: Application: Apply a 2-3 inch layer of organic mulch around the base, avoiding direct contact with the culms. Benefits: Mulch helps retain moisture, suppresses weeds, and regulates soil temperature. Containment Considerations: Root Barrier: While Oldhamii Bamboo is a clumping species, installing a root barrier can help manage its spread in confined areas. USDA Zone Optimal Zones: Best suited for USDA Hardiness Zones 8b to 11. Zone Details: Zone 8b: Average annual minimum temperatures of 15F to 20F (-9°C to -6°C). Zone 11: Average annual minimum temperatures above 40F (4.4°C). Conclusion Oldhamii Bamboo is a magnificent choice for those seeking a large, fast-growing bamboo with both ornamental and practical applications. Its towering height, combined with its non-invasive clumping habit, makes it ideal for creating impressive privacy screens, windbreaks, or even as a focal point in expansive landscapes. By following the guidelines provided here, you can ensure that your Oldhamii Bamboo thrives, adding both beauty and utility to your outdoor space for years to come.
