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Liquid Feed From a Wormery

You often read about the merits of the liquid “feed” produced as a by product of a worm composting bin, very often it is praised particularly by the manufacturers of “wormeries” that appear to produce this wonderful liquid, often referred to as “worm tea”, produced like this, worm tea it is most definitely not!
A good quality, well designed wormery will produce very little liquid if it is being managed correctly, this is because worms operate on surface area and allow a good circulation of air into the system, under normal operating conditions the majority of any liquid present will tend to evaporate off, the exception to this is when too much liquid is being added by the owner, this could be in the way of something like wet lettuce leaves, or loads of wet tea bags!

When a wormery is designed on depth and not surface area and is usually constructed out of plastic with no ventilation in the base, it will have very little air circulation and the liquid cannot evaporate, any moisture will condense on the sides of the smooth plastic and run to the bottom, to prevent this from soaking into the bedding and making the whole lot soggy, a grid is usually manufactured into the bin, a few inches above the base, this allows the liquid to drain and collect in this sump, a tap is then conveniently added to allow the liquid to drain off and advised to be used as a plant feed.

Is the liquid any good?

Sometimes it can be beneficial to plants, a lot depends on the maturity of the worm bin, if it has been established long enough for compost and wormcasts to have built up to a reasonable depth and is in good, healthy condition with no nasty smells then the liquid passing through will have dissolved some nutrients present and collected some bugs and bacteria and therefore being added to plants can be beneficial, providing the liquid has been drained regularly and not allowed to collect in the sump and stagnate. If the wormery has not been established long then the liquid being collected is not likely to have much benefit, as there will be no real nutrients and no beneficial bugs and bacteria, a bit like rinsing the waste first and watering the plants after!

Can the liquid be harmful?

Yes it can, if the compost and waste in the worm bin has gone stagnant and smelly this means that anaerobic conditions have set in (anaerobic – without air) this produces a whole lot of different bugs and bacteria (and usually dead worms) and these can be most harmful to plants, this also applies to liquid from a healthy system that has collected in the airless sump for a long time, the advice is to always dilute the liquid and this will lessen the potential harm but does not necessarily eliminate it.

What is the best way to make worm tea?

Proper worm tea is produced in a tea brewer, one of the ingredients being wormcasts or compost and is a subject in itself. A quick but less efficient way is to take a bagful of wormcasts or compost, importantly, collected from a good, healthy system (if it smells offensive in any way – leave it alone) stand the bag in a bucket of water for 24 hours, stir occasionally, drain the
liquid, dilute and use, do not bottle and store.

I hope this has been useful, please feel free to copy and download for your own private use. Strictly no commercial use or reproduction without our express, written permission.

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Composting and Worm Composting – Often Confused!

An introduction to composting and worm composting

Having acquired an ordinary compost bin from either a retailer or the local council many people believe that by adding worms it becomes a wormery, this is not the case, they are two different systems, read on to find out why!

First some information on the two different systems.

“Ordinary” composting bins or heaps

This method relies on the microbes and air present to break down the waste, if heat is being generated the composting is working well and the waste will reduce into good compost.                                                                                Because it is warm or even hot it is not a good idea to add worms believing they will help, the heat will kill or drive the worms away. For composting to work well, like all living things the microbes in the compost need a good balanced diet, this is a mix of green waste (kitchen scraps, a little cut grass etc) and brown waste (dead leaves, paper, cardboard etc) with a good supply of air, this mix should be about half and half, mixing this all together allows air into the waste, regular stirring up introduces more air and allows the compost to continue working, hence the reason for “turning the compost heap over”.

So what can go wrong?

Compost bins usually fail because they are not regularly turned over, they then become stagnant and can even smell, this is not good compost, the compost bin should be started again and the old contents spread on the garden and dug in at a later date.

“Wormery” composting or vermicomposting

As its name suggests this is done in a wormery and is distinctly different from ordinary compost bins despite much of the information available and most of this comes from retailers of such bins!
Worms work on surface area and not depth of bin so in most cases, anything over about 2 feet deep is wasted space and in fact, if used can create the “anaerobic” conditions talked about above. One of the most important factors that affects composting worms, their survival and success is the availability of air within their working environment, therefore the wormery must provide this in the form of good ventilation, the tall, upright plastic bins do not provide this. Once a suitable wormery is acquired, the worms must be installed in a bedding material, this is distinct from the food materials (waste) that is added after.
The bedding material is the area that the worms live in at the start, if conditions in the wormery are a bit off, they will seek refuge in this safe area, it is also treated as food which is why it is usually slow for the worms to process the new food you have given them, after all, they are surrounded by food!
Bedding can be made up of a variety of materials, a mix is best, some more commonly used materials are damp paper/cardboard, well rotted garden compost, well rotted manures, leaf mould, Moss peat, although there are ethical questions in using this and the moss you rake out of the lawn, do not use bagged potting composts from the local garden centre. The bedding in any wormery needs to be at least 8 inches deep up to about a foot.
Once the worms and bedding are installed, feed the first food layer, cover half the surface area to a depth of about a couple of inches, next cover this directly with a piece of black plastic even if the wormery has a lid. After about a week, check and see if the worms are feeding on the food layer, if they are nicely active feed the same amount again, if they are not active DO NOT feed, most problems are caused by continually adding food, creating anaerobic conditions and killing off the worms. Slowly build up the levels of feed according to the activity of the worms, what you see is far better than what you have read. You should now have a healthy, active wormery.

So, what can go wrong?

Number one problem has to be overloading with waste food, creating the anaerobic conditions above.
If the worms have insufficient air in the system they will do their best for as long as they can but then as the conditions become intolerable they will leave the bin (some bin manufacturers have overcome this problem by sealing and clamping the lid!) worms have a really good mechanism for crawling up the smoothest of plastics and this is why you find them all over the inside of the lid in their desperation to escape, if they cannot leave they will die. If you have one of these bins and wish to start again, it must be drilled full of holes – as many as you can without it collapsing and no the worms will not leave through the holes UNLESS the conditions inside have gone wrong, give them good conditions and they have no reason to leave.

Some waste foods are not suitable and even harmful to worms, raw citrus fruit skin, raw onions and members of the onion family such as garlic, all fermenting products and this includes warm damp bread in large quantities, some less obvious things such as using fly spray in the bin or any other chemicals.

Migrating worms

You have set up the wormery exactly as advised and yet the worms are crawling up the sides and out of the lid, why? Worms can be unsettled by many things, a constant vibration (nearby air conditioner) unsettled weather particularly low pressure, rain and storm conditions or the most common reason – they just do not like the bedding you have given them, if this is the case and you find the worms are wandering then leave the bin with the lid open under a low level light at night, just for 2 or 3 nights this forces them to stay and then they should settle, its also a good idea to place a wet cloth under the bin whilst doing this to catch any stragglers.
At Worms Direct we supply a worm and bedding kit, the bedding has been actively used by the worms and is home from home and they will settle much quicker.

I hope this has been useful, please feel free to copy and download for your own private use. Strictly no commercial use or reproduction without our express, written permission.

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Establishing a wormery

Siting your wormery

If you are siting your wormery outside, it must be in the shade for the summer months, worms hate being heated up! In the winter, it should be in an area where it will not freeze, a bit of frost and ice is not a problem but heavy freezing will again, cause problems for the worms.

Other considerations, how far do you want to carry your waste to add it to the wormery? If it drips will it stain your new patio slabs? When its full, it will be heavy, are you going to need to move it when it comes to emptying? In the summer, the little fruit flies can be a nuisance.

Wormeries can also be sited indoors in a garage or shed, this can have a lot of advantages, the temperatures are more stable and the worms will tend to be more efficient.

Setting up your wormery

Once you have sited your wormery, the next step is installing the worms, all worms need to be put into a bedding material this is not the waste you are feeding them, it is a layer below, this applies to all wormeries irrespective of the make or type.

The bedding material is where the worms will live, they do not appreciate being forced to live in neat waste food! Wormery manufacturers and suppliers recommend a whole range of “suitable” materials but most are far from ideal, these recommendations and often supplied with the wormery are materials such as shredded newspaper, torn up cardboard, moss peat and coir in brick or blocks.

The reason why worms are unhappy in taking to this type of bedding is because it is alien to them, it will have none of the beneficial bugs, bacteria and fungi that worms need to survive, ie to them- no food! so they tend to leave to find better conditions elsewhere. By far the best bedding is compost that the worms have been living in, it is home from home, it will have high levels of the bugs, bacteria and fungi, i.e. food already present and unlike the sterile ingredients above, will inoculate the new food waste to get the whole system off to a flying start. This bedding needs to be 8 inches deep or more.

The worms, there is much written about the “right” type of worms, there are many different common names given to the same worms, there are many suppliers who are supplying worms with the wrong names, there are many suppliers who actually don’t know what worms they are supplying! Basically the worms that are used in a wormery have to be composting or litter worms not soil dwelling worms such as Lumbricus terrestris or Lob worm.

There are really only two types that are offered in any quantity by suppliers for wormeries and these are Dendrobaena (Eisenia hortensis) by far the easiest to buy and Brandlings (Eisenia foetida). Dendrobaena are grown in huge quantities mainly for the fishing trade but often unwittingly passed of as Brandlings, a common name for Brandlings is Tiger worms hence you have a lot of Tiger worms for sale which are actually Dendrobaena, doesn’t help when the Dendrobaena are stripey, similar to the Tiger or Brandling worm! In our opinion, it makes very little difference which worm is used, both have “fors and against” and I am sure the arguments will continue for some years to come. At Worms Direct we supply a mix so you can have the best of both worms.

The quantity of worms to start with does really depend on the size of wormery, usually the minimum to start with is about 0.25kg around 250 worms, for the average size wormery 0.5kg would be a better start. If you try to put in too many worms they will feel overcrowded even though this is not the optimum population of the wormery, when they feel overcrowded the worms have a natural tendency to disperse.

Feeding your wormery (Vermicomposting waste)

Feeding your worms is the same as vermicomposting your kitchen waste, simply put, it is putting your kitchen waste onto the worms who will then feed on it and pass it out as worm casts. When the worms are established in their bedding material, the first layer of kitchen waste is put on top, this should only be a couple of inches thick, if it were any more it is in danger of composting on its own and producing heat, its the production of this heat that we want to avoid.

When the food waste is in contact with proper, active bedding it will be inoculated by all the bugs, bacteria and fungi in the bedding, this will then start the waste to decay and the worms will move in to feed, as it decays and is being eaten, more waste is added, a couple of inches at a time, it is crucial that the worms are given time to really get stuck into the kitchen waste before adding the next layer lest it should all start to heat up!

Over a period of many months you will notice that the layers are turning into compost and the worms are moving up to the fresher layer, at the same time they will be breeding and increasing the population. There are a few points that should be noted with the feeding. Green waste, i.e. kitchen scraps should not be the only food, added to this should be an equal amount of paper, cardboard and/or dead leaves, this makes a balanced diet for the worms. Tough woody or straw based waste takes a long time for worms to deal with and is best left out along with bones, meat, fish, oil and fats. Certain green wastes should also be avoided and these are raw onions and members of the onion family, citrus fruit skin and not too much citrus fruit itself. The ideal condition of the kitchen waste should be chopped up, but don’t waste too much time and well mixed up before adding to the wormery.

Harvesting the compost

At some point your wormery will need emptying of the compost that has built up, with the flow through system this has been a continual process since it was set up. For the multiple tray systems the theory is that the worms will have moved up to successive trays allowing you to empty the compost from the lower tray – not always the case! see article on “problems”.

For the simple box, single tray or a worm bed in the ground you have no option but to clean out the compost. There are several ways this can be done from feeding them on one side to encourage the worms to move over to up ending the lot and sorting by hand. You can just put the whole lot into the garden, worms and all and start from fresh, this is probably the easiest way but some people like to get their hands dirty and save every last worm!

The best way is as follows: A few day before harvesting is necessary feed plenty of the favourite food (you should know this by now) but any soft fruit always encourages the worms, after a couple of days, choose a bright day, quickly remove all the uneaten food waste, including worms from the surface and put to one side in a bucket, on a clean sheet either on the ground or preferably on a large table up end the box or if its too big, carefully dig out all the compost and pile it into a pyramid, you will notice the worms will burrow away from the light towards the centre of the pyramid, carefully remove as much compost from around the pyramid until you come to worms, leave it for 30 minutes or so and repeat, do this as many times as necessary until you are left with a large lump of worms and compost ready to go back into the wormery and start again, you will not need new bedding just use as much of the harvested compost as necessary and that’s it! it really is the best way and technology has not helped much in this case.

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Composting………………….dog poo!

Getting rid of dog poo is something most of us would prefer not to think about too much , however it is a fact of life if you keep dogs, one of the most successful ways to do this is to compost it using worms. Being organic worms will compost it just the same as any other organic waste matter, the method is pretty much the same but there the similarities stop.

So what is the best system? lets face it, dog poo is not something most people would like to have a hands on experience with, to this end some wormery systems are best avoided, in our opinion the stacking tray system is one of these,  the best would be a simple box. To set this up you will need a box, preferably plastic, the typical kerb side recycling box with a lid often used by local councils are ideal, nothing smaller, into this the worms and bedding need to be placed, the small Worm and Bedding Kits as supplied by us are ideal, the dog poo is added and the worms allowed to get on with it, the same advice as to overloading the worms applies, if it is overloaded and the worms cannot cope, you will end up with a bin full of just dog poo, if it is regulated and well managed the worms will process the waste and there will be no smell, when the bin is almost full, stop adding poo until the worms have finished processing the last bits. It is advisable to dispose of the whole lot, worms included (unless you have no objections to sorting the worms out!) and to start again. If the dogs have been wormed, the poo cannot be added until the wormer has cleared the dogs system, give it at least a couple of weeks.

Dog poo compost cannot be used in any growing medium particularly for anything edible! it should not be used as a soil conditioner in vegetable plots or even flower beds, it may be possible to use it under large shrubs or trees but to be safe, children must not have access.

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My worms are dead!

Occasionally we will get a ‘phone call or an email from a customer who has received their order for worms that they have arrived with some dead, dying or very lethargic, when we query as to what makes the customer think they are dead, the response is invariably that the worms are not moving much, many people assume that worms are very active, wriggly creatures, whilst this is true when you have just dug them up (they are now attempting to get away from a situation where they are likely to be eaten! why else would they be dug up?) but when they have been harvested, packed and then shipped out in a moving vehicle the worms response is to burrow down, stick together, stop moving, “play dead” and hopefully I will not get eaten! disturbance, movement, vibration etc are all threats to worms.

We always send out worms in A1 condition, there is no point in doing so otherwise so unless something exceptional happens to them on route it is almost impossible for them to die, the exception to this maybe when smaller quantities are sent out in tubs and they have been left out under the sun, possibly during delivery or more likely when requested to leave or some other extreme conditions, if this has happened then the evidence is very obvious and distinctive.

When the worms arrive and they do appear lethargic do not write them off, if they are composting, garden or fishing worms and you are not ready to use them straight away, give them a little water and/or wet newspaper/moss and place the closed container somewhere cool for them to get over their journey, if they are composting worms and you can, add them to the wormery straightaway do so and give a little water, this applies if you have bought loose worms or in a kit.

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How many??

Posted in Feb 2009, afcbpaul asks about the number of worms in a wormery.

“OK I am very new to this, but I am a grass care professional and I would like vermicompost to make compost tea.

I have access to large amounts of horse manure, and I know that will make good worm feed once it has completed the first hot composting.

But what I would like to know is:
1.Is it better to have fewer large worms in my wormery or many more smaller ones?”

The more worms you have the quicker the waste will be composted, also if you have a mix of sizes, you will have worms of breeding size that will be busy laying eggs, increasing the population and there will also be juveniles and babies that like all creatures will be feeding and growing. Have a look at our advice sheet,  “Establishing Your Wormery

Nigel.