Get your hands on an old bathtub.
Shouldn’t be too difficult as there seems to be plenty of them for sale. Now that house prices are high many people are choosing to renovate rather than building new. I bought this one on Trade Me for $11.50.
Make up a frame to support the bath.
Raising the bath tub means feeding and harvesting the worms and their castings can be done at a comfortable height. I chose to make a timber frame as the cast iron bath was heavy and I needed to feel relaxed that it was safe and not likely to topple over. If you don’t wish to go to this extent concrete blocks or railway sleepers would suffice.
Make grate to fit the bottom of the bath.
The purpose of this is to create a free draining environment for the worms and to allow for collection of the liquid fertiliser or “worm tea”.
Place netting over the wooden grate.
I used a staple gun to attach it to the timber so that it remains in the correct position. Small nails or tacks would work equally well.
Attach tap to bath waste pipe.
For a few dollars these components can be found in the plumbing department of most hardware stores. Fitting a tap to the base of the bath means that nothing is wasted and the rich black liquid that the worms produce can be used on your garden and house plants.
Line the bath with weed mat.
This matting needs to allow water to flow through it. Some are tightly woven and don’t have good drainage qualities therefore its important to use the right type. To keep the weed mat in place I used 50mm wide sellotape. For the tape to adhere well make sure the surface of the bath is clean and dry.
After shifting bedding and food from some smaller bins I introduced the tiger worms to their “new digs”, approximately 4000 of them.
Cover the worm farm.
Lastly a lid or cover is necessary to keep out the light and to protect the worms from heavy rain and other unwelcome visitors. Worms are photophobic and unlike we humans prefer to be kept in the dark.
At the time of writing this post I hadn’t made any ventilation holes in the lid but will do that within the next few days. Once that has been done my first bathtub worm farm will be complete.
I enjoyed making the worm farm but will use an acrylic bath next time as this one was extremely heavy. That aside I’m sure my worms will relish their new accommodation and hopefully increase their numbers within the next few months.
Perhaps you’ve made a worm farm recently, if so any thoughts, suggestions or comments would be most welcome.
Post Script: Have made some minor changes to the farm as the worms were escaping into the lower area of the bath. With this fine tuning now complete all is working well again … you can check it out here.