
Worm farm castings are a nutrient-rich soil amendment that can benefit plants in many ways. They contain a balanced mix of nitrogen, phosphorus, and potassium, making them an excellent natural fertilizer.
Worms break down organic matter into a fine, crumbly texture that's easy to mix into soil. This process can improve soil structure and increase its water-holding capacity.
Adding worm castings to your soil can also help reduce soil pH, making it more suitable for plants that prefer acidic or neutral conditions. Some plants, like azaleas and blueberries, thrive in acidic soil.
Worm castings can be used to create a natural potting mix that's free of synthetic fertilizers and pesticides. This is especially beneficial for indoor plants, like herbs and succulents, that can be sensitive to chemicals.
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What Are Worm Farm Castings?
Worm farm castings are a type of organic fertilizer made from the waste of worms.
They repel pests and help plants grow and absorb nutrients under challenging conditions.
Unlike chemically treated soil, worm castings provide healthy bacteria that enriches the soil.
We produce our castings in "wedges", where about 10,000 worms are fed a weekly dose of 1-2" of compost.
What Are Worm Farm Castings?
Worm farm castings are famous for repelling pests and helping plants grow and absorb nutrients under challenging conditions.
Organic worm castings provide healthy bacteria that enriches the soil, creating more sustainable fertilizer.
We produce our castings in "wedges", where about 10,000 worms are fed a weekly dose of 1-2" of compost.
As they feed on compost and more is added, they eat through the wedge and leave behind coveted castings (poop), which are harvested and offered for sale.
All castings are boxed fresh daily to ensure you take home active microbes.
Castings
Worm farm castings are a nutrient-rich fertilizer perfect for your garden. They can be harvested from a worm bin or vermicomposting system and stored for extended periods.
Worm castings can last for up to a year if stored in a dry and cool place. The longer you store them, the less effective they become.
Fresh worm castings are teeming with beneficial microorganisms essential for plant growth. These microorganisms begin to die off over time, reducing the potency of the castings.
To store worm castings, keep them in an airtight container to prevent moisture from getting in. This will help prevent the castings from clumping together.
A little worm casting goes a long way, and it's not possible to overdo it. They are not "hot" like other fertilizers, meaning they won't burn or shock your plants.
Worm castings can be added directly to your raised garden beds or other garden soil as a rich natural fertilizer. They also help to improve soil aeration, drainage, and moisture retention.
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Harvesting and Storage
You can harvest worm castings every three to six months, depending on the size of your worm bin, the amount of organic matter you add, and the number of worms in your bin.
The frequency of harvesting worm castings depends on several factors, including the size of your worm bin, the amount of organic matter you add, and the number of worms in your bin.
To determine if it’s time to harvest the castings, check the bottom of your compost bin for a layer of dark, crumbly compost with a pleasant earthy smell and no worms or undigested organic matter.
If the compost has a pleasant earthy smell and is free of worms and undigested organic matter, it’s ready to harvest. You might notice a layer of dark, crumbly compost at the bottom of the bin.
You can harvest worm castings by scooping them out using a small trowel, or by picking through the material a little by hand to sift out large pieces of food matter, lumps of shredded paper or other bedding, and worms.
Sift through the castings and throw back large pieces of food matter, lumps of shredded paper or other bedding, and as many worms as you reasonably can. If the worm castings are clumpy, try to break up the large chunks.
You can store worm castings in a sack, clean bucket, or another container until you are ready to use them. They are teaming with healthy soil bacteria and nutrients that are perfect for adding to soil.
Preparing for Harvest
Don't expect worm castings to be ready for harvest immediately, as the worm bin needs to get established and be routinely fed and fluffed for a few months first.
This gives the worms time to eat, turn things over, and break down food and bedding into worm castings – their poop. Finished worm castings look similar to good, rich soil, dark brown, tiny, round bits of material that have passed through their system.
You can think about harvesting worm castings once you begin to see the worm bin transforming from raw materials into finished worm castings.
How Long Do Farms Last
Farms can last for a long time, but it's essential to consider the lifespan of certain components.
Worm castings, a nutrient-rich fertilizer, can be stored for up to a year if kept in a dry and cool place.
The longer you store worm castings, the less effective they become due to the death of beneficial microorganisms.

Fresh worm castings are best used as soon as possible after harvesting for optimal results.
If you need to store worm castings for an extended period, keep them in an airtight container to prevent moisture from getting in.
Direct sunlight can cause worm castings to dry out and lose effectiveness, so it's best to keep them out of direct sunlight.
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Preparing for Harvest
Before you start harvesting your worm castings, it's essential to prepare your worm bin. This means giving the worms time to eat, turn things over, and break down food and bedding into worm castings – their poop. A worm bin needs to get established and be routinely fed and fluffed for a few months first.
The worm bin needs to transform from raw materials into finished worm castings. Finished worm castings look similar to good, rich soil. They're dark brown, tiny, round bits of material that have passed through their system.
You can think about harvesting worm castings once you begin to see this transformation. However, it's crucial to leave enough worms behind to keep composting. A few worms may come along for the ride, and some of their egg cocoons and tiny babies will inevitably be harvested. That's fine!
To prepare for harvest, it's essential to check the bottom of your compost bin. The castings will accumulate at the bottom of the bin, and you might notice a layer of dark, crumbly compost. If the compost has a pleasant earthy smell and is free of worms and undigested organic matter, it's ready to harvest.
Here are some key things to keep in mind as you prepare for harvest:
- Give your worm bin time to get established and break down food and bedding into worm castings.
- Check the bottom of your compost bin regularly to see if the castings are ready to harvest.
- Leave enough worms behind to keep composting.
Remember, worms will migrate towards food, so you can use this to your advantage when harvesting. By providing a food source in a specific area, you can encourage the worms to move away from the castings and make harvesting easier.
How to Make

To make a garden bed ready for harvest, start by clearing any debris or weeds that may be competing with your crops for water and nutrients.
First, remove any dead or dying plants to prevent the spread of disease.
Check the soil pH to ensure it's within the optimal range for your specific crops.
Add organic matter like compost or manure to improve soil structure and fertility.
For example, adding 2-3 inches of compost can increase soil's water-holding capacity by up to 20%.
Next, till the soil to a depth of 8-10 inches to loosen and aerate it.
This will help roots grow deeper and promote healthy plant growth.
Finally, rake the soil to create a smooth, even surface for planting.
Harvesting and Processing
Harvesting worm castings is a straightforward process, but timing is key. You can harvest worm castings every three to six months, depending on the size of your worm bin, the amount of organic matter you add, and the number of worms in your bin.
The frequency of harvesting worm castings depends on several factors, and as a rule of thumb, you can harvest them every three to six months. To determine if it's time to harvest the castings, check the bottom of your compost bin for a layer of dark, crumbly compost.
The worm bin needs to get established and be routinely fed and fluffed for a few months first, giving the worms time to eat, turn things over, and break down food and bedding into worm castings. Finished worm castings look similar to good, rich soil, dark brown, tiny, round bits of material that have passed through their system.
One simple method of harvesting worm castings is by scooping them out with a small trowel, but you may need to pick through the material a little by hand to sift out large pieces of food matter and lumps of shredded paper or other bedding. Large chunks can be broken up to make the castings more manageable.
Using a screen can make the harvesting process easier and more efficient. A simple screen made from hardware cloth attached to a wood frame can sift out large bits of matter and leave you with fluffy, broken-up worm castings. The holes in half-inch hardware cloth seem perfect for the job, catching large chunks and allowing the worm castings to fall through.
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Worm Farm Castings Uses
Worm farm castings are incredibly versatile and can be used in a variety of ways to benefit your plants. They're a rich natural fertilizer that can be added directly to your garden beds or soil to improve aeration, drainage, and moisture retention.
A little goes a long way with worm castings - even a small amount can make a big difference in your garden. They're not "hot" like other fertilizers, so you can't overdo it and risk burning or shocking your plants.
One of the best things about worm castings is that they're perfect for seedlings - add a handful to the planting hole or use them in seedling start mix for a boost. They're also great for fruit trees and houseplants - give them a special treat by adding some worm castings to the soil.
Use Farm
Worm castings can last for up to a year if stored in a dry and cool place. The longer you store them, the less effective they become.
A little worm casting goes a long way, so don't overdo it! You can't burn or shock your plants with worm poop.
Add worm castings directly to your raised garden beds or other garden soil as a rich natural fertilizer. They help improve soil aeration, drainage, and moisture retention.
One of the best things about worm castings is that they can be used on nearly any type of plant. They contain all the essential nutrients that plants need.
Worm castings can be used as top dressing, side dressing, or worked into the soil. They're perfect for seedling start mix when starting plants from seed.
You can even use worm castings to make actively aerated compost tea (AACT) with them. This is a great way to give your plants an extra boost.
Remember, a little worm casting can make a big difference in your garden. So go ahead and give it a try!
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Compost Tea
Compost tea is a liquid solution made from worm castings, compost, humic acid, kelp meal, and BSFL Nutrient Plus. It's a great way to promote plant strength and treat mild deficiencies.
You can add compost tea to your soil to give your plants a boost. This liquid gold can also help fight off pests and inhibit disease.
To brew compost tea, you need to combine the ingredients and suspend them in pure well water. Then, you need to pump air into it for 24 hours to make the microbes reproduce quickly.
Compost tea is available for sale at the farm on Fridays and Saturdays for $9 per gallon. If you bring your own container, you'll get $1 off.
This same compost tea is used for the mobile tea spray service, which is available seasonally.
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Red Wiggler and Castings
Red Wiggler worms are the Cadillac of composting worms, hatched and bred right here on the Arizona Worm Farm.
These incredible home and garden worms provide a natural, chemical-free alternative to breaking down waste and fertilizing soil. A fantastic option for backyard gardeners and families looking to set up a worm composting bin in their homes.
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Red Wigglers are sold in bed run bags for $45 each, containing a gallon of bedding substrate with 500-700 breeders, juveniles, and cocoons as well as an array of co-decomposers.
You can order a bed run bag shipment by giving them a call, and they ship out every Monday. Within the state of Arizona, shipping costs $59, and out of state shipping costs $65.
Worm castings, produced by the Arizona Worm Farm, are famous for repelling pests and helping plants grow and absorb nutrients under challenging conditions.
Organic worm castings are harvested from "wedges" where about 10,000 worms are fed a weekly dose of 1-2" of compost, leaving behind coveted castings (poop) that are boxed fresh daily.
All castings are offered for sale, providing healthy bacteria that enriches the soil and creates more sustainable fertilizer.
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Part I
Worm farm castings are a treasure trove of nutrients for your plants. They contain a rich mix of nitrogen, phosphorus, and potassium, making them a perfect natural fertilizer.
Worms break down organic matter into a liquid fertilizer that's 5 times more concentrated than compost. This liquid gold is a game-changer for gardeners and farmers.
Worm castings can improve soil structure, increase water retention, and support beneficial microbes. This leads to healthier plants with deeper roots and a stronger immune system.
Red wigglers, the most common worm species for worm farming, can eat up to half their body weight in food every day. They're voracious eaters and can process a lot of organic matter quickly.
A worm farm can produce up to 2 pounds of castings per square foot per year. This is a significant amount of fertilizer that can be used to feed your plants.
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Frequently Asked Questions
Can I just put worm castings on top of soil?
Yes, you can apply worm castings directly on top of the soil, where the roots grow. This is called top dressing and is a simple way to give your plants a nutrient boost.
How much worm castings can 1000 worms make?
1000 composting worms can produce 8-16 ounces of worm castings daily, perfect for a small to medium-sized composting operation
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