Raised-bed gardening

[2] The spacing is such that when the vegetables are fully grown, their leaves just barely touch each other, creating a microclimate in which weed growth is suppressed and moisture is conserved.

[2] They can be created over large areas with the use of several commonly available tractor-drawn implements and efficiently maintained, planted and harvested using hand tools.

[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.

On the market are also prefab raised garden bed solutions which are made from long lasting polyethylene that is UV stabilized and food grade so it will not leach undesirable chemicals into the soil or deteriorate in the elements.

A double skinned wall provides an air pocket of insulation that minimizes the temperature fluctuations and drying out of the soil in the garden bed.