What Are Worm Castings?
Worms (Red Wigglers, most commonly) are used as a means of composting rich organic materials (like food waste) in a process called vermicomposting. Worms can be used to aid composting mostly because it speeds up the process. But they also co-exist with a robust and beneficial microbial and fungal community. Vermicompost is the finished product from the vermicomposting process. Within finished vermicompost, you will find worm castings… worm poop! When folks talk about pure worm castings, they probably haven’t collected an isolated stool sample from a worm, and are more likely referring to the whole output of a vermiculture system, vermicompost, which will largely consist of worm castings.
Benefits Of Using Vermicompost Or Worm Castings
Worm castings, like other critter manures, are an excellent addition to soil. Unlike other manures, they don’t smell strongly (they have a rich earthy scent). Vermicompost is a valuable addition to your garden because it improves seed germination and plant growth and development. The benefits of using worm castings or vermicompost include:
- adding slow release, plant-available nutrients
- provides nitrogen, phosphorus and potassium (NPK), macronutrients required by all plants
- includes a compliment of micronutrients not found in most synthetic fertilizers
- adding soil organic matter
- improves moisture retention
- improves porosity, texture and tilth (makes it fluffy and less compact(able))
- allows soil to better store and release essential nutrients
- improving ability of soil to buffer against changes in pH
- introduce beneficial microbes and fungi to soil, helping the ‘good guys’ out compete plant diseases and pests
In short, vermicompost is a complete fertilizer that promotes soil and plant health in more ways that providing immediate nutrients. Adding vermicompost to soil supports soil’s ability to cycle and function. Long term use of synthetic fertilizer damages soil microflora and vermicompost helps to restore natural balance.
Another major benefit of using vermicompost in your garden is that you can make it yourself – out of your garbage! If you’re looking for a big haul of vermicompost, you’re probably looking to buy it. One of the disadvantages can be price and/or availably. The good news here is that adding vermicompost and caring for your soil as a living system will minimize additions required in the future.
How To Use Vermicompost
There is no wrong time to add vermicompost to soil. Frequent application is worthwhile. However, the best bang for your buck is to mix vermicompost with soil at time of seeding or transplanting. Remember, you’re adding a live product. You want to keep it alive by avoiding drying. Ideally, vermicompost is placed under the soil surface, away from sunlight and major changes in moisture, when roots will directly interact with the vermicompost.
When applying vermicompost to growing plants, rake it into soil as best as possible. Water thoroughly to move whatever possible into the soil. Bonus points for covering with mulch. The best bet to recieve the benefit of vermicompost for growing plants is to use a vermicompost tea. (There will be more posts about vermicompost tea for sure! I’m finding this to be a great tool in applying vermicompost)
How Much To Apply
It’s hard to apply too much vermicompost. It can’t burn plants in the same way that synthetic fertilizers can. The short (and frustrating) answer is: some is good, more is better. Additions as low as 5% or 1 part vermicompost: 20 parts soil are known to improve plant growth and health. But a good rule of thumb is about 10-20% vermicompost is a generous amount. This is a bit less then 1 part vermicompost : 3 parts soil.
“The only wrong way to use vermicompost or worm castings is to not use it at all!” – Steve, Urban Worm Company
I mix vermicompost into my potting soil and my house plants are killin’ it. So glad to have found this organic input.
I buy this in large quantities to use in my gardening. It makes a big difference. Going organic has changed the way I garden. You have to be a bit more creative, but adding vermicompost is my secret weapon.
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