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  1. Home
  2. Garden

How to make a wicking-bed trough

Wicking beds - for the time-poor gardener in you - by Better Homes and Gardens
  • 13 Oct 2016
How to make a wicking-bed trough Phil Aynsley

Gather your supplies

• 1100 x 470 x 470mm fibreglass trough

• 1000 x 100mm-dia. PVC pipe

• 100mm-dia. PVC end-cap

• 1000 x 50mm-dia. PVC pipe

• 50mm-dia. PVC 90° elbow

• 50mm-dia. PVC end-caps (2)

• 13mm-dia. irrigation pipe

• 20mm scoria

Click here for more information on wicking beds. 

You’ll also need

Geotextile fabric; builder’s plastic; sharp scissors; drill and bits; clamp; hacksaw; array of herbs and vegies; potting mix; composting worms

Here's how

...
Phil Aynsley

Step 1 Line bottom and sides of trough with geotextile fabric, leaving an overhang all round.

...
Phil Aynsley

Step 2 Place a lining of builder’s plastic over fabric, pushing it down against inner walls and base.

...
Phil Aynsley

Step 3 Using hacksaw, cut a length of 50mm-dia. PVC pipe a little shorter than length of trough. Clamp it to work surface then, using drill, make evenly spaced holes all around.

Tip  If the drill slips, use a small gauge bit to drill pilot holes, then follow with larger-gauge bit.

...
Phil Aynsley

Step 4 Place 1 of the 50mm-dia. PVC end-caps on 1 end of pipe, and PVC 90° elbow on other end. Cut another length of 50mm-dia. PVC pipe, long enough to reach from bottom of trough to about 10cm above top. Attach 1 end of this length to 90° elbow.

...
Phil Aynsley

Step 5 Position pipe assembly in the base of the trough.

...
Phil Aynsley

Step 6 Drill a 13mm-dia. hole in side of trough adjacent to vertical section of PVC pipe, 200mm from base, for overflow pipe. This pipe removes excess water and will ensure the trough doesn’t flood when it rains.

...
Phil Aynsley

Step 7 Remove pipe assembly from trough. Measure, mark and drill a 13mm-dia. hole in vertical section of PVC pipe, also for overflow pipe.

...
Phil Aynsley

Step 8 Reposition pipe assembly in trough. Cut a short piece of 13mm irrigation pipe (about 8-10cm long) and push through hole in trough into hole in vertical section of PVC pipe.

Step 9 Fill the water reservoir section of trough (here, the bottom 200mm) with scoria.

Tip If the scoria is unwashed, first spread it on the ground and hose well to remove any fine dust.

...
Phil Aynsley

Step 10 Cut a piece of geotextile fabric to size and place it over the scoria layer. This ensures no soil will filter down through scoria and clog-up irrigation feed pipe.

Step 11 Fill up remaining trough space with potting mix.

...
Phil Aynsley

Step 12 Using hacksaw, cut a 40cm length of 100mm-dia. PVC pipe. Drill a network of holes in lower half of pipe and place 100mm-dia. PVC end-cap on top. Bury pipe in middle of trough, where it will work as the ‘worm tunnel’. 

Step 13 Using sharp scissors, trim excess builder’s plastic and geotextile around lip of trough.

...
Phil Aynsley

Step 14 Plant trough with herbs and vegetables. Fill reservoir with water via inlet pipe, then place remaining 50mm-dia. end-cap on top. This endcap only needs to sit loosely, as it’s removed regularly for water top-ups.

Step 15 Remove cap from top of worm tunnel pipe and place fresh vegetable and fruit peelings in base, followed by a handful of composting worms. Top up regularly with peelings – the worms will consume them, turning them into plant food, which will leach out into the surrounding soil to feed the plants.

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