Construction Materials

Wicking beds built on school grounds must be made from safe, durable materials that meet regulatory standards. All materials should be non-toxic and able to withstand long-term outdoor exposure without breaking down.

Key requirements:

• Materials must be non-toxic and suitable for outdoor use.
• Timber must be:
  • Sustainably sourced
  • Durable enough to withstand long-term outdoor exposure (7 years or more)
  • Free from rot, fungus, and pests
  • Not treated with CCA (Chromated Copper Arsenate).
• All bolts and screws must be:
  • Galvanised for weather resistance
  • Installed flush with timber surfaces to avoid injuries

Source:

• 12.5 External timber finishes and decking

The timber we suggest complies with these regulations:

• Micro PRO Sienna treated pine for logs and decking
• ACQ-treated timber for vertical joint covers
• Hardwood fence palings (which are naturally durable) to protect the liner.

Location

When selecting the location of wicking beds, regulatory compliance has to be taken into account, as well as plant health and the convenience of staff and students.

Key requirements:

• Beds must not block the view of staff or security personnel, preventing blind spots.
• The combined height of the bed and plants must allow adequate supervision of the school grounds.
• Beds should be positioned so that they cannot be climbed and present access to other areas such as walls or roofs.
• Beds must be placed in a location which receives 6–8 hours sunlight per day.
• Location of the beds must allow students to effectively reach all areas of the bed, and ensure that children don’t feel inclined to climb in.
• Hoses must be secured in a manner that prevents tripping or children from accessing them unless supervised.
• Tools should be stored safely when not in use.

Source:

• 21.1.4.1 Raised planter beds
• 7.9 Safety and security in design
• External areas | worksafe.gov.au

Growing and Plants

When growing plants in school wicking beds, the following requirements apply:

• No plants that are common allergens or produce excessive pollen or dust are to be grown.
• Plants must not create blind spots nor present a risk of causing injury if toppled and falling out of the bed.
• No fresh animal manures allowed in the beds.
• Compost, soil conditioners, mulches, potting mixes, and soils must comply with Australian Standards, including:
  • AS 4454 Compost, soil conditioners and mulches
  • AS 4419 Soils for landscaping and garden use
  • AS 3743 Potting mixes

We suggest:

• Avoid industrial chemicals to protect the soil biology and ensure long-term plant health.
• Work with your groundskeeper to ensure no chemicals are used around the wicking beds, helping to maintain the integrity of the soil and plants.

Disclaimer

The information provided on this site is for informational purposes only and is provided “as is” without any warranties or guarantees. It does not constitute legal, regulatory, or professional advice. You are responsible for ensuring compliance with your local laws and regulations. Always consult with a qualified professional regarding your specific situation.

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