Wood-fired raised planting beds for wood rot resistance - Burning wood to enhance durability for gardening
In the realm of urban gardening, Bonnie L. Grant, a professional landscaper with a Certification in Urban Gardening, introduces us to a unique and resilient gardening solution: Shou Sugi Ban raised garden beds.
Originating from Japan during the Edo period, Shou Sugi Ban is a wood preservation method that has evolved into a sought-after building material. Initially popular among the lower classes due to its affordability and durability, it gained prominence in the 1970s.
The traditional preparation of Shou Sugi Ban involves charring wood, a process that imparts a deeply black colour and an alligator skin texture to the material. This charring also serves a practical purpose, as it makes the wood resistant to pests, rot, and fire. The charring process also reduces and repels insect pests, making the wood difficult for termites to burrow into.
Cedar, particularly red cedar, is the traditional wood used for Shou Sugi Ban, but other woods such as pine, oak, hemlock, and maple may also be used, depending on preference, budget, and aesthetic.
To create Shou Sugi Ban raised garden beds, you will need to construct the beds in your desired dimensions using wood planks, corner bracing pieces, and an optional cap piece, all combined with screws. The charring of the boards can be done before or after assembly, using a large propane torch.
After charring, a thick coat of natural oil, such as linseed or tung oil, is applied to all surfaces of the boards. This oil seals the wood, filling gaps and providing an additional layer of protection. The oil is allowed to soak in for 10 minutes, after which excess is wiped away.
It is essential to work with Shou Sugi Ban in a safe and responsible manner. Wear appropriate clothing, eye protection, boots, and fireproof gloves. Have water ready nearby while working, and ensure you are burning the wood on a surface that will not catch fire, such as a cement driveway or patio. Gravel spaces can be used, but should be soaked first to prevent fire.
Brushing the wood with a wire brush after charring eliminates excess ash and fills gaps. If dry spots remain, the oil can be reapplied.
Once the Shou Sugi Ban raised garden beds are constructed and treated, they offer a long-lasting, durable, relatively inexpensive, and aesthetically pleasing solution for urban gardening. The charring process strengthens the wood, making it impervious to rot for long periods of time.
In conclusion, Shou Sugi Ban provides a modern yet rustic finish for raised garden beds, while also offering numerous practical benefits. Whether you are a seasoned gardener or a novice, Shou Sugi Ban could be an exciting addition to your urban gardening endeavours.
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