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2. Raised-bed gardening - Wikipedia

   en.wikipedia.org/wiki/Raised-bed_gardening

   Lumber is the most common construction material for making raised beds. [2] If using lumber treated with chromated copper arsenate or CCA (though uncommon since 2004 in the US and Europe [4] [5]), it is recommended to use a plastic liner between the wood and soil if the raised bed is intended for growing edibles.

3. Chromated copper arsenate - Wikipedia

   en.wikipedia.org/wiki/Chromated_copper_arsenate

   Chromated copper arsenate (CCA) is a wood preservative containing compounds of chromium, copper, and arsenic, in various proportions.It is used to impregnate timber and other wood products, especially those intended for outdoor use, in order to protect them from attack by microbes and insects.

4. Wood preservation - Wikipedia

   en.wikipedia.org/wiki/Wood_preservation

   These processes autoclave the treated wood, subjecting it to pressure and heat, along with nitrogen or water vapour to control drying in a staged treatment process ranging from 24 to 48 hours at temperatures of 180 °C to 230 °C depending on timber species. These processes increase the durability, dimensional stability and hardness of the ...

5. Alkaline copper quaternary - Wikipedia

   en.wikipedia.org/wiki/Alkaline_copper_quaternary

   The copper in ACQ treated wood accelerates corrosion of galvanized steel fasteners (such as nails and screws) 10 times or more in comparison with CCA-treated wood. Stainless steel (AISI 316) is not affected. [7] Aluminium and Galvalum fasteners should be avoided. [8] One should use fasteners made of hot-dipped galvanized steel, copper, or ...

6. French intensive gardening - Wikipedia

   en.wikipedia.org/wiki/French_intensive_gardening

   A 3x3 foot bed is the minimum size needed to create the micro climates necessary for successful planting, however most prefer a bed length of 5, 10, or 20 feet to make calculations easier and yields larger. [6] Traditionally, raised beds are the first image to come to mind when thinking of a French intensive garden.

7. Thermally modified wood - Wikipedia

   en.wikipedia.org/wiki/Thermally_modified_wood

   Thermally modified wood is engineered wood that has been modified by a controlled pyrolysis process of wood being heated to (> 180 °C) in an oxygen free atmosphere. This process changes to the chemical structures of wood's cell wall components lignin , cellulose and hemicellulose which decreases its hygroscopy and thus increases dimensional ...