Name: Gaia Green Worm Castings
Brand: Gaia Green
SKU: GAGWC30L
Price: 17.95 USD
Availability: InStock
Rating: 4.9 (33 reviews)

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Gaia Green Organic Worm Castings in a stand-up pouch, a nutrient-rich soil amendment for organic gardening.

Two bags of Gaia Green Worm Castings organic soil fertilizer in green and brown stand-up pouches.

Put living biology back into your soil

Gaia Green Worm Castings are pure vermicompost from African nightcrawlers, the rich, dark castings earthworms leave behind as they digest peat moss and organic grains. Every bag carries living microbes and organic matter, the two things a bottle of nutrients can't give your soil. Worm castings feed the microbes, the microbes feed the soil, and the soil feeds your plants.

OMRI Listed for organic growing Gentle 2-0-0, won't burn 100% African nightcrawler vermicompost

Free shipping on orders over $49

30-day returns on all orders

Serving growers since 2006

Why it's different

Bagged compost and raw manure vs. Gaia Green Worm Castings

Bagged Compost or Raw Manure

Quality swings from bag to bag depending on the feedstock
Raw or hot manure can burn roots and needs curing first
Shelf-stable, bagged amendments are often microbially dead
Under-composted material can carry weed seeds or pathogens
Heavy composts compact and choke root-zone drainage
Organic status is often unclear or uncertified

Gaia Green Worm Castings

Nightcrawlers raised on a set diet, so every bag matches the last
Gentle 2-0-0 that won't burn seedlings, transplants, or roots
Ships as living vermicompost, ready to inoculate the root zone
Pure castings, no raw manure and no weed seeds
High organic matter that improves aeration, drainage, and water holding
OMRI Listed for certified organic growing

Why worm castings work: it's the biology, not the NPK

The 2-0-0 label makes worm castings look weak next to a bag of 4-4-4. But that number only counts the small amount of nitrogen the castings release on their own. It completely misses the actual job: castings are a concentrated dose of the microbes and organic matter earthworms produce as they digest their food.

Those microbes are what unlock nutrition. They break down the amendments already in your soil, hold nutrients in the root zone instead of letting them wash out the bottom of the pot, and feed the fungi and bacteria that plants trade sugars with underground. Worm castings don't feed the plant so much as they wake up the soil, which is why growers layer them in alongside a dry-amendment program rather than instead of one.

What makes it different

A soil conditioner and microbial booster in one bag

A living microbial inoculant OMRI Listed

Each bag is packed with the beneficial bacteria and fungi earthworms produce. Worked into your mix, they colonize the root zone and go to work converting organic matter into food roots can actually take up.

Impossible to burn 2-0-0

With effectively no salt load, there is no hot-spot risk. Mix it into seed trays, transplant holes, and houseplant pots without worrying about scorching tender roots.

Consistent every bag

The nightcrawlers are raised on a set diet of peat moss and organic grains, so what you buy this season matches what you bought last season. No mystery compost.

Fixes soil structure

The organic matter behaves like a sponge in the root zone, holding moisture while still letting excess water drain. It loosens heavy mixes and gives light, sandy ones something to grip.

Makes your amendments work harder

Paired with a top-dress of Gaia Green All Purpose 4-4-4 or Power Bloom 2-8-4, the biology breaks those amendments down and releases them on the plant's schedule instead of all at once.

A natural, renewable input

Castings are simply what earthworms produce, not something mined or manufactured in a plant. That makes them one of the lowest-impact ways to enrich a soil mix.

Specs

Numbers and details

Guaranteed Analysis

2-0-0 (2.0% N, 0.14% S)

Derived From

African nightcrawler vermicompost

Certification

OMRI Listed

Form

Moist, dark, low-odor castings

Outdoor and lawn rates

Garden and landscape: mix in 2 L per square meter, about a half gallon per 10 sq ft, once a month. Lawn: apply up to 2.8 kg per 10 square meters per year. Container blend and top-dress rates are in the usage steps just below.

Four ways to use it

1

Blend into a fresh mix

Mix 5 to 10% castings by volume into a new batch of soil or potting mix at fill. The biology and organic matter are in place from day one.

2

Add at transplant

Work a scoop into the planting hole and backfill. Because it can't burn, seedlings and fresh clones go straight in with no shock.

3

Top-dress living plants

Sprinkle about 3 tablespoons per gallon of soil on the surface each month, scratch it into the top half-inch, and water it in.

4

Brew a casting tea

Steep a few scoops in water, ideally with an air stone, to multiply the microbes, then pour it into the root zone as a living drench.

In the bag

What you're getting, and which size to buy

Every bag delivers

Pure African nightcrawler vermicompost, no fillers
Living beneficial bacteria and fungi
High organic matter for structure and moisture
2.0% nitrogen and 0.14% sulfur, gentle and slow
No raw manure, no synthetic additives
OMRI Listed for certified organic use

Which size to buy

2L pouch: top-dressing pots and feeding houseplants
2L, 2-Pack: two pouches, a little saved vs. buying singles
30L bag: blending fresh soil batches and larger grows
Pair with: All Purpose 4-4-4 and Power Bloom 2-8-4 for a full organic program

Not sure which size fits your grow? Tell us how many pots you're running and we'll point you to the right one. 716-217-0353 / help@happyhydro.com

Questions

Frequently asked questions

Do worm castings replace my regular fertilizer?

No, and that's by design. At 2-0-0 castings are a soil and microbial booster, not a complete feed, so most plants still want a real nutrient source alongside them. The castings make that nutrient source go further by keeping the soil biology active and holding what you feed in the root zone. If you want a full organic program, run them with All Purpose 4-4-4 in veg and Power Bloom 2-8-4 in flower.

How much do I use, and can I use too much?

The usage steps above cover the common cases, from blending a fresh mix to a monthly top-dress. You really can't overdo it: there's no salt load to burn anything, so extra castings just add more organic matter. Past a certain point you're spending money on soil conditioning rather than nutrition, which is why most growers stick near the listed amounts.

Will worm castings bring fungus gnats or pests?

The castings themselves are clean, finished vermicompost, not raw manure, so they don't arrive carrying pests. Fungus gnats are a moisture problem, not a castings problem: they show up when the top layer of any soil stays wet too long. Let the surface dry between waterings and you'll keep them away.

Can I use this in coco or hydro, or only soil?

Soil and coco are the natural fit, whether in containers or beds. It's a solid amendment, so don't drop it straight into a recirculating hydro reservoir where it would clog things up. If you run hydro and still want the microbes, brew the castings into a tea and use that as a drench instead.

Can I mix castings into my reused or spent soil?

Yes, and it's one of the best uses. When you recharge old soil with dry amendments after a harvest, add a scoop of castings per gallon at the same time. The fresh biology speeds up the breakdown of the amendments and brings tired soil back to life. Our Soil Re-Amend Kit bundles castings with everything else you need for that.

Does it expire or go bad in the bag?

The biology is hardy, so there's no hard expiration date, but treat it like a living product. Store the bag sealed, cool, and out of direct sun, and keep the castings slightly moist. What kills the microbes is letting the bag fully dry out or baking in a hot shed all summer, so avoid that and it will keep for a long time.

What if I receive a damaged bag or the product isn't right for my setup?

If you receive a defective or damaged unit, email us a photo at help@happyhydro.com and we'll make it right immediately. For change-of-mind returns, we accept returns within 30 days for items in new, resalable condition. If you're not sure whether this product is right for your setup, call us first at 716-217-0353. We'd rather answer your questions before you order.

Why should I buy Gaia Green Worm Castings from Happy Hydro instead of somewhere else?

Happy Hydro has been selling growing equipment since 2006. We've carried Gaia Green for years because the systems work great and customers who buy them leave happy. Have questions before you order? Call 716-217-0353 or email help@happyhydro.com. We're easy to reach and happy to help!

Why Happy Hydro

Why Buy From Happy Hydro

Happy Hydro began as a pipe dream in a garage and has grown into something built almost entirely on word of mouth and repeat customers. Rather than focusing on raising margins and obsessing over profits, we've always believed that the right combination of competitive prices, superior products, and world-class customer service speaks for itself. Our philosophy will never change: when you're happy, we're happy.

Our commitment

What you can expect from Happy Hydro

Real People, Real Growers

Our grower support team isn't a call center. They know the products because they're passionate about growing. Reach us Monday-Friday, 10 am-4 pm EST at 716-217-0353 or help@happyhydro.com, before you order or after.

Hand-Picked by Growers, for Growers

Every brand we carry was chosen by our founders because it performs. We only stock premium brands we believe in, and every item is inspected before it leaves our warehouse.

Fair Prices and Free Shipping

We work hard to keep our prices as low as manufacturers allow, and we include free shipping on orders over $49 so there are no surprises at checkout. Find a lower price anywhere and we'll match it.

Authorized for Every Brand We Carry

We're an authorized dealer for every manufacturer on our site. That means you get the full manufacturer's warranty on every purchase. No grey market, no expired stock.

30-Day Returns on Most Orders

Hard to commit to a product you haven't tried. Return most items within 30 days in original condition and we'll take care of it. Read the full policy.

Secure Shopping, Private Data

Every transaction is SSL encrypted. We don't store payment information and we will never sell your data to anyone, ever.

Volume and Commercial Pricing

If you're a commercial grower or putting together a large order, reach out before you buy. We have pricing available that we can't advertise publicly. Call 716-217-0353 or email help@happyhydro.com and we'll take care of you.

Questions? We're easy to reach.
Happy Hydro has been serving growers since 2006. Call or email our grower support team Monday-Friday, 10 am-4 pm EST, or email us anytime.

716-217-0353 help@happyhydro.com

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Gaia Green Worm Castings

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