Name: Gaia Green Greensand
Brand: Gaia Green
SKU: GAGGS20KG
Price: 27.95 USD
Availability: InStock
Rating: 5.0 (4 reviews)

Click on image to zoom

Gaia Green Greensand in a green resealable stand-up pouch, an organic soil amendment for gardening.

10kg brown paper bag of Gaia Green Greensand with a label featuring ocean waves and usage instructions.

20kg brown paper bag of Gaia Green Greensand with a blue ocean label and product information.

Loosen heavy soil and feed it slow potassium

Gaia Green Greensand is glauconite, an iron potassium silicate mined from ancient ocean seabeds and ground into a fine, gritty green sand. It does two jobs most amendments can't combine, slowly releasing potassium, iron, magnesium, and manganese while it reshapes how your soil handles water. It loosens heavy clay, it helps light soil hold moisture, and it feeds without ever burning.

Slow-release potassium and minerals Loosens clay, holds moisture Pure glauconite, no additives

Free shipping on orders over $49

30-day returns on all orders

Serving growers since 2006

Why it's different

Plain sand or perlite vs. Gaia Green Greensand

Plain Sand or Perlite

Adds air pockets but no nutrition at all
Contributes no potassium or trace minerals
Perlite floats up and blows off the surface
Sand can pack down and worsen drainage in clay
Does nothing for the soil's mineral content
Purely physical, scatters or breaks down over time

Gaia Green Greensand

Conditions texture and feeds minerals in one amendment
A slow source of potassium, iron, magnesium, and manganese
Gritty glauconite holds moisture rather than shedding it
Loosens compacted clay without packing back down
Slowly rebuilds the soil's mineral content
Stays in the soil and keeps working season to season

Why greensand does two jobs at once

Greensand is glauconite, a mineral that formed on ancient ocean floors over millions of years. Ground up, each grain is porous and gritty, which is what lets it fix opposite problems with the same product. Mixed into heavy clay, it wedges the packed particles apart and opens up drainage. Mixed into loose, sandy soil, it acts like a sponge that holds water and nutrients in the root zone instead of letting them run through.

Then there's the chemistry. Glauconite is an iron potassium silicate, so it slowly releases potassium along with iron, magnesium, and manganese as soil weathers it. The potassium is locked in the mineral rather than dissolved as a salt, which is why greensand feeds gently over months and can't burn roots the way a soluble potash feed can. You're conditioning the soil and slowly remineralizing it in a single step.

What makes it different

A soil conditioner and mineral feed in one

Fixes soil texture both ways Soil conditioner

Loosens heavy, compacted clay so roots and water can move, and helps light or sandy soil hold moisture instead of draining straight through. One amendment for two opposite soil problems.

Slow-release potassium 0-0-0.2

The potassium is bound in the glauconite and released gradually as the soil weathers it, so plants get a steady trickle rather than a salt spike.

Iron, magnesium, and manganese too

Beyond potassium, greensand carries iron, magnesium, and manganese, the kind of trace minerals that quietly run down in soil you reuse grow after grow.

Gentle, won't burn

With almost no soluble salt, there's no way to scorch roots. It's safe around seedlings, transplants, and even sensitive houseplants at any reasonable amount.

Works for seasons

Because the minerals are bound in rock, one application keeps conditioning and feeding rather than washing out with the next few waterings.

Pure marine glauconite

Nothing but the mined mineral from ancient seabeds, no synthetic additives. Where Basalt Rock Dust brings volcanic silica and minerals, greensand adds potassium and the soil-loosening grit, so many growers run both.

Specs

Numbers and details

Guaranteed Analysis (NPK)

0-0-0.2

Key Nutrients

K₂O 0.2%, Mg 0.5%, Fe 1.0%, Mn 0.05%

Origin

Glauconite, ancient ocean seabeds

Form

Fine, gritty green sand

Outdoor and turf rates

Gardens and landscapes: broadcast and lightly work in up to 400 g per square meter, about 8.2 lbs per 100 sq ft, up to once a month through the growing season. Turf: broadcast at the same rate. Container methods are in the usage steps just below.

Four ways to use it

1

Loosen heavy beds

Work greensand into compacted or clay-heavy soil to open it up for roots and water. The outdoor broadcast rate is in the specs above.

2

Help light soil hold water

Mix it into sandy or fast-draining beds and containers so moisture and nutrients stay in the root zone longer instead of running through.

3

Blend into potting mix

Because it can't burn, mix a modest amount through a new batch of soil at fill. No need to measure to the gram, it conditions and feeds as it weathers.

4

Top-dress and be patient

Scratch a thin layer into the surface of established pots or beds and water in. The minerals release over months, so treat it as a long-term soil builder.

In the bag

What you're getting, and which size to buy

Every bag delivers

Pure mined glauconite greensand, nothing added
Slow-release potassium at 0.2% K₂O
Iron, magnesium, and manganese
A gritty texture that loosens clay and holds moisture
No soluble salts, so no burn risk
No synthetic additives or chemicals

Which size to buy

1.25 kg / 2.75 lb: containers, houseplants, and trying it out
10 kg / 22 lb: regular garden and raised-bed use
20 kg / 44 lb: large beds, lawns, and conditioning at scale
Pair with: Basalt Rock Dust, All Purpose 4-4-4, Power Bloom 2-8-4, and Worm Castings

Not sure how much you need? Tell us whether you're loosening clay, holding water in sand, or topping up minerals, and we'll help you size it. 716-217-0353 / help@happyhydro.com

Questions

Frequently asked questions

Is greensand a fertilizer or a soil conditioner?

Mostly a conditioner, with a slow mineral feed on the side. At 0-0-0.2 it isn't a real fertilizer, so it won't cover a plant's nitrogen and phosphorus needs. Its value is the texture work and the steady trickle of potassium and trace minerals. Run it alongside a full feed like All Purpose 4-4-4 rather than in place of one.

How is this different from basalt rock dust?

Both are slow rock-mineral amendments, but they come at it differently. Basalt Rock Dust is volcanic and leans toward silica and a broad remineralizing profile. Greensand is marine glauconite, and its strengths are potassium plus the gritty texture that loosens clay and holds water. They complement each other, which is why plenty of growers use both in the same soil.

Will it actually fix my heavy clay, and how much do I use?

It helps, but think improvement over years rather than an overnight fix. Worked into clay at the broadcast rate in the specs above and repeated over a few seasons, greensand gradually opens the soil up. Because it can't burn, going a little heavy won't hurt, so you have room to be generous with badly compacted ground.

Will greensand change my soil pH?

Not meaningfully. Greensand sits close to neutral and weathers slowly, so it isn't a liming agent and won't swing your pH the way lime would. In most mixes you can add it without recalculating anything. If you're holding tight to a target pH, add it and check as you normally would.

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

Soil, raised beds, and coco are where it shines, especially reused or living soil where the minerals have time to weather in. It's a gritty solid, so it doesn't belong loose in a recirculating hydro reservoir where it would settle out. In containers, it doubles as both a texture amendment and a slow mineral top-up.

Does it go bad, and how should I store it?

Rock doesn't expire, so there's no shelf life to track. Keep the bag sealed between uses and store it somewhere cool and dry. Dry greensand stays loose and easy to broadcast, while a damp, clumped bag just makes it harder to spread evenly.

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 Greensand 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

Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.

Recover password

Gaia Green Greensand

Description