By Jenny Mills · rural nurse & homesteader · health, safety, law and the paperwork of going bush
“After losing my first three tomato plants to drought in year one, I finally built wicking beds that saved my harvest during the 2022 bushfire season.”
— Jenny. Paperwork first, then the fun part.
ArticlesCalculatorsSite PlannerShopForget fancy drip systems. Wicking beds are the only way to garden off-grid in Australia without sweating over watering. Here's how they work, and why you're doing it wrong if you're not using one.
Forget fancy drip systems. Wicking beds are the only way to garden off-grid in Australia without sweating over watering. Here's how they work, and why you're doing it wrong if you're not using one.
Bottom of the bed = sealed reservoir. No need for expensive tanks. Just a plastic container (or repurposed drum) at the base. Fill it with 10-15cm of water. That's it. The wicking medium pulls water up as needed. No pumps, no electricity, no hassle.
Stop buying $50 bags of "wicking sand". You need coarse river sand or washed concrete sand. Not play sand. Not potting mix. Coarse is key – it lets water move up fast. Get 50kg bags from Bunnings or local builders' merchants. Costs $15-$20. That's it.
What NOT to use:
Fill the reservoir once a week. That's all. If you're watering the soil surface more than that, you're doing it wrong. The reservoir should be full when you start, and empty by next week. If it's still full after 7 days? You've got a leak or the sand's too fine.
Check it: Stick your finger in the soil. If it's damp 10cm down, you're good. If it's dry, fill the reservoir. If it's soggy, wait. No exceptions.
Size matters: Make beds at least 1m x 1m. Smaller ones dry out too fast. 30cm deep is enough – no need for 60cm.
Drainage holes: Drill 10mm holes in the reservoir container. Every 15cm. Without them, water pools and kills roots. Do it before you build.
Planting depth: Don't bury seeds deeper than 2x their size. Wicking beds are shallow. If you plant tomatoes 10cm deep? They'll drown.
Coarse sand: Bunnings, $18 for 50kg bag. Get it from the "Garden" section, not "Potting Mix".
Reservoir container: Repurpose a $10 plastic drum from the hardware store. Or buy a $25 "wicking bed reservoir" from Wicking Beds Australia (they're overpriced but work if you're lazy).
Build it yourself: Use $30 of recycled timber from your local tip. No need for fancy liners – just a plastic sheet under the sand. Bunnings sells 2m x 2m sheets for $12.
Cost to build a 1m x 1m bed: $50-$70. That's less than one week of bottled water for a normal garden. Do it now. Your tomatoes will thank you.
Stop overcomplicating it. Wicking beds work because they're simple. Fill the reservoir. Wait a week. Water again. Done.
Worth a watch: [Off Grid Build] Kitchen Garden Wicking Bed · Bombadil Hill
While many off-grid projects are achievable as DIY, certain situations require licensed professionals:
Always check local regulations and obtain necessary permits before commencing work.