Name: Gaia Green Basalt Rock Dust
Brand: Gaia Green
SKU: GAGBRD2KGP
Price: 12.95 USD
Availability: InStock
Rating: 4.8 (18 reviews)

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A bag of Gaia Green Basalt Rock Dust with green packaging and a mountain landscape graphic, used for organic gardening.

Put the minerals back that every grow takes out

Gaia Green Basalt Rock Dust is finely ground volcanic rock, mined from an ancient deposit in British Columbia and rich in the silica, iron, magnesium, and calcium that soil loses over time. It isn't a fertilizer with an NPK number. It's the mineral foundation underneath one, slowly weathering into the trace elements that plants and soil microbes both rely on. It won't burn, it won't wash out, and one application keeps working for seasons.

OMRI Listed for organic growing Rich in silica and trace minerals Slow-release, won't burn

Free shipping on orders over $49

30-day returns on all orders

Serving growers since 2006

Why it's different

Feeding NPK alone vs. adding Gaia Green Basalt Rock Dust

Feeding NPK Alone

Replaces the big three, nitrogen, phosphorus, and potassium, and little else
Trace minerals keep depleting grow after grow
No silica for the plant to build into its tissue
Salt-based feeds can build up and need flushing
Fast-release, so you re-buy and re-apply constantly
Does little for long-term soil health

Basalt Rock Dust

Adds a broad spectrum of minerals and trace elements
Re-mineralizes depleted soil the way fresh volcanic sediment does
A natural source of silica plants build into their cell walls
Inert rock, no salt load and nothing to flush
Slow-release, so one application feeds for seasons
Supports soil biology and builds long-term fertility

Why rock dust matters: your soil is a mineral bank you keep withdrawing from

Every harvest carries minerals out of your soil for good. Plants pull silica, iron, magnesium, calcium, and dozens of trace elements out of the root zone and lock them into the leaves, stems, and fruit you cut and remove. Bottled nutrients and dry NPK amendments top up nitrogen, phosphorus, and potassium, but they were never meant to replace the full mineral spectrum that rock provides.

In nature, geology refills that bank. Volcanic ash, glacial grinding, and eroding bedrock constantly seed soil with fresh minerals. Basalt rock dust does the same job out of a bag. Because it's ground fine, soil acids and microbes can weather it steadily, releasing minerals on a slow schedule rather than in a salt spike. Gaia Green calls it a remineralizer for that reason: it rebuilds what your plants keep drawing down, instead of feeding them for a single cycle.

What makes it different

The mineral layer under a healthy organic soil

A full spectrum of rock minerals OMRI Listed

One amendment covering silica, iron, magnesium, calcium, and a wide range of trace elements, the minerals that macro fertilizers leave out and that a little more of every grow removes.

A natural source of silica

Plants take up silica and build it into their cell walls and tissue. Basalt is one of the simplest organic ways to keep that supply topped up in your mix.

Slow-release by nature

It's solid rock, so nothing dumps at once. Soil acids and microbes weather the fine dust gradually, which is why a single mix-in keeps releasing minerals across more than one grow.

Impossible to burn

There's no salt or NPK load to scorch roots, so you can work it into seed starts, transplants, and established pots without any burn risk.

Supports soil biology

The mineral surfaces and trace elements give the bacteria and fungi in your root zone more to work with, part of why remineralized soil tends to stay productive longer.

Built for reused and no-till soil

If you recharge old soil with amendments like All Purpose 4-4-4 or Worm Castings, basalt is the mineral half of that reset, replacing what the last crop hauled off.

Specs

Numbers and details

Guaranteed Analysis

Iron (Fe) 5.5%, Manganese (Mn) 0.08%

Key Minerals

Silica, iron, magnesium, calcium

Source

Ancient BC volcanic deposit

Organic Status

OMRI Listed

Outdoor and turf rates

Gardens and landscapes: broadcast and work in up to 3 kg per 10 square meters, about 6 lbs per 100 sq ft, up to a maximum of 12 kg per 10 square meters, about 24 lbs per 100 sq ft, per year. Container and top-dress rates are in the usage steps just below.

Four ways to use it

1

Pre-mix into fresh soil

Blend 1 tablespoon per gallon, about 15 ml per 4 L, into potting mix or bagged soil and mix it in thoroughly before planting.

2

Top-dress established pots

Use the same one-tablespoon-per-gallon rate, gently dug into the soil surface about once a month, then watered in.

3

Broadcast over beds and turf

For gardens, landscapes, and lawns, spread and work it in at the outdoor rates listed in the specs above.

4

Water in and give it time

Rock dust works slowly. The minerals release as soil weathers the dust over weeks and months, so treat it as a long-term soil investment, not an instant feed.

In the bag

What you're getting, and which size to buy

Every bag delivers

Finely ground BC volcanic basalt, nothing added
Silica plus iron, magnesium, and calcium
A wide range of plant and soil trace elements
No NPK salts, so no burn risk at any rate
Slow-release remineralization for tired soil
OMRI Listed for organic growing

Which size to buy

2 kg / 4.4 lb: containers, top-dressing, and trying it out
22.68 kg / 50 lb: beds, no-till, and remineralizing at scale
Pair with: All Purpose 4-4-4, Power Bloom 2-8-4, Worm Castings, and Super Fly

Not sure how much you need? Tell us how many pots or how much bed space you're remineralizing and we'll help you size it. 716-217-0353 / help@happyhydro.com

Questions

Frequently asked questions

Is rock dust actually worth it, or is it hype?

It depends on how you grow. Basalt is a slow, long-game remineralizer, not a quick feed, so you won't see an overnight jump. Where it earns its place is in reused, living, or no-till soil, where trace minerals and silica genuinely deplete over successive crops and need replacing. If you swap in fresh bagged soil every single grow, you'll notice the difference less.

Will basalt change my soil pH?

Not in a way you need to plan around. Basalt sits close to pH-neutral and weathers slowly, so it won't swing your soil the way a strong lime would. In most mixes you can add it at the label rate without recalculating anything. If you're already running tight to a target pH, add it and check as usual.

How is this different from the other Gaia Green amendments?

The others feed the plant and the biology; basalt rebuilds the rock minerals underneath them. All Purpose 4-4-4 and Power Bloom 2-8-4 deliver NPK, Worm Castings and Super Fly bring microbes and biology, and basalt has no NPK at all. It's a remineralizer, so it complements those amendments rather than replacing any of them.

How much do I use, and how often?

The usage steps above cover pre-mixing, top-dressing, and outdoor broadcasting. Because it releases so slowly, you don't reapply it often: mixing it in at fill sets you up for a long stretch, and a monthly top-dress is plenty if you want to keep fresh minerals cycling. There's no salt load, so getting the amount slightly high won't hurt anything.

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

Soil and coco are the natural fit, in containers or beds. It's a fine mineral dust that settles, so it doesn't belong loose in a recirculating hydro reservoir where it would sink and clog lines. Living-soil and no-till growers get the most out of it since the minerals have time to weather in place.

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

Rock doesn't expire, so there's no shelf-life to worry about. Keep the bag sealed between uses and store it cool, dry, and out of direct sun, and protect it from frost. Dry dust is easy to handle and spread; a damp, clumped bag just makes application messier.

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 Basalt Rock Dust 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 Basalt Rock Dust

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