Raised-bed gardening

flower bedraised bedraised bedsRaised bed gardeningbedsflower bedsdisabled access plant bedsgarden bedraised garden bedsraised vegetable and flowerbeds
Raised-bed gardening is a form of gardening in which the soil is enclosed in three-to-four-foot-wide (1.0–1.2 m) containment units ("beds"), which are usually made of wood, rock, or concrete and which can be of any length or shape.wikipedia
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Gardening

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Raised-bed gardening is a form of gardening in which the soil is enclosed in three-to-four-foot-wide (1.0–1.2

Permaculture

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Raised beds lend themselves to the development of complex agriculture systems that utilize many of the principles and methods of permaculture.

Square foot gardening

crop crowdingMel Bartholomew
This form of gardening is compatible with square foot gardening and companion planting.

Hügelkultur

hugelkultur
Hügelkultur is a horticultural technique where a mound constructed from decaying wood debris and other compostable biomass plant materials is later (or immediately) planted as a raised bed.

Keyhole garden

Circular raised beds with a path to the center (a slice of the circle cut out) are called keyhole gardens.

Waru Waru

Waru warn
The technique combines raised beds with irrigation channels to prevent damage by soil erosion during floods.

Compost

compostingcompostablecomposted
The soil is raised above the surrounding soil (approximately six inches to waist-high) and may be enriched with compost.

Vegetable

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Vegetable plants are spaced in geometric patterns, much closer together than in conventional row gardening.

Plant

Plantaeplantsflora
Vegetable plants are spaced in geometric patterns, much closer together than in conventional row gardening.

Microclimate

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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.

Erosion

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They can be used effectively to control erosion and recycle and conserve water and nutrients by building them along contour lines on slopes.

Companion planting

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This form of gardening is compatible with square foot gardening and companion planting.

Wicking bed

A self watering raised bed known as a wicking bed is particularly beneficial in dry climates and are often made by converting Intermediate bulk container (IBC's).

Intermediate bulk container

ContainerIBC toteintermediate bulk containers
A self watering raised bed known as a wicking bed is particularly beneficial in dry climates and are often made by converting Intermediate bulk container (IBC's).

Wood preservation

wood preservativetreatedTreated lumber
Pine that was treated using chromated copper arsenate or CCA, a toxic chemical mix for preserving timber that may leach chemicals into the soil which in turn can be drawn up into the plants, is a concern for vegetable growers, where part or all of the plant is eaten.

Chromated copper arsenate

CCATanalith
Pine that was treated using chromated copper arsenate or CCA, a toxic chemical mix for preserving timber that may leach chemicals into the soil which in turn can be drawn up into the plants, is a concern for vegetable growers, where part or all of the plant is eaten.

Hardwood

hardwoodshardwood treeshard wood
If using timber to raise the garden bed, ensure that it is an untreated hardwood to prevent the risk of chemicals leaching into the soil.

Railroad tie

sleeperstiessleeper
A common approach is to use timber sleepers joined with steel rods to hold them together.

Concrete masonry unit

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Another approach is to use concrete blocks, although less aesthetically pleasing, they are inexpensive to source and easy to use.

Polyethylene

polythenePEpolyethene
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.

UV degradation

UV stabilizerUV stabilizeddegradation
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.

Therapeutic garden

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Botanical garden

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In the 18th century, systems of nomenclature and classification were devised by botanists working in the herbaria and universities associated with the gardens, these systems often being displayed in the gardens as educational "order beds".