Tag Archive for: sustainability

Worm Farms…Tips and Tricks

After writing my post yesterday on how to build a DIY worm farm, I thought it might be useful to write another post explaining how to look after your worms, and also provide some reasons why you might consider worm farming in the first place.

In their National Waste Policy fact sheet, the Australian Government estimate that two-thirds of waste sent to landfill is organic. If you’re not sure what I mean by organic, it’s the waste that originally came from plants and animals which can be broken down. As well as the obvious grass clippings, food scraps and bones, this includes cardboard, paper and wood. In 2006-2007, Australians landfilled almost 14 million TONNES of organic waste. A full garbage truck holds 10 tonnes. Sending all that organic waste to landfill meant an extra 1.4 million garbage trucks on our roads. Even if you think Australia’s got the space, that’s a lot of unnecessary heavy road traffic, not to mention fossil fuel burning and airborne pollutants via vehicle emissions.

Next up, soil quality. Australia has some of the oldest land masses on Earth, and consequently they are nutrient-poor and with little organic matter. Perth has some of the worst agricultural soils in the world. (Someone once told me that it was officially the poorest soil in the world, but I can’t find anything that confirms it. However, ask anyone who ever tried to grow anything in the soil in Perth, and they’ll confirm it for you!) The sandy soil repels water and also nutrients. If you want to grow plants in Australia, you need to improve your soil by adding organic matter. And this is where the worms come in!

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Worms and their castings. Castings are the product created when worms break down organic matter, and contain nutrients that plants can uptake easily.

Worms eat organic waste and break into down into a product called castings. These castings contain beneficial nutrients that can easily be absorbed by plants. Their texture also enables them to retain water and so they are great for improving soil structure. And they won’t burn plants, as some chemical fertilizers do. Castings are also suitable for seedlings. Worms also produce a liquid that needs to be drained – worm wee! (Or more technically, leachate.) Some tips on using worm wee are provided below.

And keeping worms is fun! It’s free, they require very little maintenance, meaning you can go on holiday for weeks and they will still be alive on your return – how many pets can you say that about?

Tips & Tricks

So I’ve made the case for reducing fossil fuels, reducing landfill, improving your garden and having fun…so what’s keeping you from getting your own worm farm? Is it any of these?

1. Worm Farms smell.

Actually, they don’t smell if you look after them properly. Castings have an organic smell similar to the earthly smell of soil. The main cause of smelliness is too much food. It can be tempting once you set up your worm farm to add every single scrap of food to it immediately, but worms only eat their body weight in food every day, so you need to start small and increase the food once the worm numbers build up.

2. I don’t have a garden.

Neither do I! The worm farm takes up only a very small amount of space, and it will take several months to fill up the worm farm with castings. You can use them with house plants or pot plants and even if you don’t garden, you are bound to know someone who does so just give them the box of castings once it is full.

3. I don’t have time.

Seriously, how much time do you think you need?! Once the worm farm is set up, all you do is empty your food scraps that you would have thrown in the bin into the worm farm. It helps to have the worm farm nearby – if it’s located at the bottom of the garden you are far less likely to make the trip.

Problem-Solving

This is by no means an exhaustive list, but hopefully covers some of the more common problems that you might encounter.

My worm farm smells

Likely cause: too much food

Solution: STOP ADDING FOOD! Give the worms a chance to eat what they already have. Anaerobic conditions (no oxygen) can also cause this so give the top layer a stir to aerate.

My worms are escaping

Likely cause: If it is only a couple of worms, there is probably not an issue. If there is a mass exodus, then there may be too much moisture or too much food.

Solution: Add newspaper to reduce the moisture levels, and stop feeding if there are large amounts of uneaten food.

I have other pesties in my worm farm

Likely cause: Not all insects in your worm farm are problems, and you should expect to find other creatures making their home here. But some pests indicate problems.

Solution: Burying food should keep unwanted pests at bay. Flies indicate there is too much food, so reduce the feeding. Ants indicate that the conditions are too dry, so add water.

Other Things to Know

  • You need to use composting worms for your worm farm – varieties such as red worms or tiger worms, as these are adapted to the conditions of a worm farm, whereas ordinary earthworms are not.
  • Worms prefer cooler conditions so on a very hot day, add an ice pack above the worm blanket to keep the inside of the worm farm cool. However, freezing will kill them! (This is not a problem we have here in Perth but may be an issue in cooler climates.) If you are expecting a frost, bring the worm farm indoors.
  • Worms do not have teeth, but suck in food. The smaller the food particles are, the more they can eat. Blending or chopping helps, but if you can’t be bothered, freezing the food then allowing to thaw will help break down the cell walls and make it easier for your worms. And if you can’t manage that, just try to bury your food so it doesn’t attract pests.
  • Worms don’t like acidic conditions and don’t like acidic food such an onions and citrus. Avoid giving these to your worms.

Worm Wee vs Worm Tea

You may come across references on the internet to both worm wee (leachate), and worm tea. The two names are often mistakenly used interchangeably, but they refer to different products. Leachate is what drains from the worm farm. Worm tea is a product made using castings, water and molasses, which are “brewed” for 24-48 hours. The main difference is that worm tea is aerobic, and so great for plants, whereas leachate can be anaerobic.

Leachate is fine to add to compost, but if your leachate is anaerobic it may harm your plants. I learnt this the hard way, diluting my leachate to a 1:10 ratio (1 part leachate for 10 parts water) and pouring on my seedlings, which caused them all to go yellow and die.

The way my worm farm is designed, my leachate does not have much contact with air and so will always be anaerobic. If your leachate drains freely into an open container it will probably be aerobic. You can try to aerate your leachate by diluting and exposing to air for a couple of days before using. However, always exercise caution when using on plants. Make sure you dilute 1:10 with water, and avoid using on seedlings, house plants or other temperamental plants.

How to Build a DIY Worm Farm

One of the first things I noticed once I stopped buying plastic packaging was that my rubbish bin was now filled almost exclusively with organic waste – vegetable peelings, fruit skins and cores, leaves and the like. In the UK my local council had provided a brown bin for organic waste, which was industrially composted, but here in Perth Australia it was heading straight to landfill.

This meant someone was driving a truck to my flat, picking up my organic waste, driving it to a landfill site, dumping it into a hole in the ground and covering it with rocks. With fuel and machinery costs, wages, increased pollution from vehicle emissions, and the resulting contaminated land, it seemed like a lot of energy (and effort) was being wasted dealing with something I could potentially deal with at home.

And so I built a worm farm! I use the term ‘built’ loosely, as there was no actual building involved. In fact, it is dead simple. Additionally, I spent ZERO! Nothing! Zilch!

How to Build a Worm Farm

What you will need: two polystyrene boxes, a skewer, scissors, junk mail or shredded paper, some worms, an old towel

I salvaged two polystyrene boxes with lids from my local supermarket. (I just went to the Fruit & Veg section and asked a member of staff.) In Australia, vegetables such as broccoli and Brussels sprouts are delivered in these, and once emptied of stock, they are simply thrown away.

The boxes need to be the same width and length, but the same depth is not necessary.

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Two insulated boxes, courtesy of the supermarket. The bottom box doesn’t need a lid as the other box sits directly on top.

The boxes will be stacked on top of one another, so if they are different depths, choose the shallowest to sit on the bottom.

The top box is for the worms, and so needs drainage holes. The bottom box will be used to collect liquid that drains from the other box, so no holes in this one! To pierce holes in the bottom of the box simply use a skewer, making the holes approximately an inch apart.

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Drainage holes allow liquid to drain away, and stop your worms from drowning. The liquid collects in the bottom box.

Place a layer of cardboard at the base of the top box so that the worms do not fall through the holes. Next, add some shredded paper to make bedding for the worms. This is a great way to get rid of those annoying supplements and catalogues that come in the newspapers, or in the mail.

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If you don’t have a shredder (I don’t) then you can make strips of paper for bedding by cutting slits in a newspaper at 1cm intervals along the spine, and then tearing.

Using a litre of water (ideally rain water of filtered water, if you have) pour carefully over the bedding to ensure it is wet. Any excess water will drain through to the bottom box.

And then…worms! I got mine from a friend but many community gardens offer them either free or for a small fee. You can also find them on gumtree or freecycle. If all else fails they can be purchased at the big DIY stores but be aware that these will have potentially been sitting on the shelf for a long period of time and may not be in very good health, so will take longer to get going.

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The worms in their new home : ) One fistful of worms needs one fistful of food per week. It’s important not to overfeed them as this means a stinky worm farm and can also attract other unwanted pesties who want in on the action.

Finally, cover the worms with an old towel, sack or carpet, or if you don’t have these to hand then use cardboard. This cover keeps the worms dark and damp, and keeps flies out. If you’ve used cardboard or something biodegradable you will eventually have to replace this as it will disintegrate over time.

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An old flour sack acting as a worm blanket, as I don’t have any old towels.

Lastly, replace the polystyrene box lid, after piercing a couple of holes for air, and place in a shaded spot. My worm farm lives on my balcony but it would be fine to keep indoors in a laundry or kitchen…if you wanted to!

Do not feed the worms for a few days to give them a chance to settle into their new home.

And there you have it – a DIY worm farm that didn’t cost you a penny!