Silica Root Zone

Plant-available silica, straight to the root zone. It also unlocks phosphorus your soil is already holding. For growers who want a change this month, not next season.

Plant-available silica, straight to the root zone. It also unlocks phosphorus your soil already holds.

4.8  61 grower reviews
$37.95
$44.95

CHOOSE YOUR SIZE

MILLED IN SMALL BATCHES FROM A SINGLE OREGON DEPOSIT

MILLED IN SMALL OREGON BATCHES

OMRI LISTED

CDFA ORGANIC INPUT

pH-NEUTRAL · NO CAUSTIC SILICATES

OMRI LISTED

CDFA ORGANIC INPUT

pH-NEUTRAL

OMRI 
LISTED

CDFA ORGANIC INPUT

pH-NEUTRAL · NO 
CAUSTIC SILICATES

WHY IT SELLS OUT

Small batches. We don't stretch them with filler.

Only a small fraction of each mill run dissolves fast enough to matter in days. We won't pad it out with cheap filler, so runs are finite.

Only a small fraction of each run dissolves fast enough to matter in days, and we won't stretch it with filler.

 

Batch 24-B is on the shelf. Last run went in 19 days. No fake countdown, and no invented stock numbers.

Batch 24-B is on the shelf now. Last spring's run went in 19 days. No fake countdown here, and no invented stock numbers. When a batch is gone, we mill the next one.

Not sure between this and the season-long bag? A grower on our team will tell you straight if Root Zone isn't what your plants need.

Title

24-B

CURRENT BATCH

19

DAYS THE LAST RUN LASTED

2–4 μm

MILLED PARTICLE SIZE

HOW IT WORKS

HOW IT WORKS

Two jobs, one scoop, from the first watering.

Milled fine enough that a real fraction dissolves immediately, right where the fine roots work. Two things follow.

PARTICLE SIZE IS THE WHOLE ARGUMENT

SAND

100 μm

SILT

10 μm

ROOT ZONE

SILICA ROOT ZONE

2–4 μm

A mineral only works where it meets water. Ground from silt-size to 2–4 microns, the surface area multiplies. Same rock as cheap silica sand, ground until it's actually usable.

WHAT YOU'RE COMPARING IT TO

VS THE BOTTLE

The bottle looks cheaper until you do the math.

A quart of potassium silicate is $15 of mostly water, and you re-buy it every few weeks. The honest side-by-side, including where the bottle wins.

 

ROOT ZONE

LIQUID 

Time to available

Days

Then gone

pH of concentrate

Neutral

10–12

Frees phosphorus

Yes

Minimal

Cost per application

≈ $1.58

≈ $2.10

Bottle still wins at

Needs stirring

No mixing

COMPETITOR PRICING AND COST-PER-APPLICATION ARE ESTIMATES

 

SILICA EARTH (DRY MINERAL)

LIQUID K-SILICATE BOTTLE

SILICA SAND / DE

Time to available

Days

Immediate, then gone

Years

pH of concentrate

Near neutral

10–12 · caustic

Neutral

Frees phosphorus

Yes

Minimal

No

Cost per application

≈ $1.58

≈ $2.10, re-bought

Pennies, no effect

Shipping water

None

~90% of the bottle

None

Where the bottle wins

Needs stirring

Pre-dissolved, no mixing

Cheapest per pound

COMPETITOR PRICING AND COST-PER-APPLICATION ARE ESTIMATES

HOW TO USE IT

Three ways in. No chemistry set.

Three ways in. No chemistry set.

It goes in through water. Stir into suspension and apply. At 2–4 microns it won't settle in a can, a sprayer or a fertigation line.

RATES · CONFIRM AGAINST LABEL

Transplant

½ tsp/gal · every 2 wks

Under stress

1 tsp/gal · every 10–14 d

Established

1 tsp/gal + foliar · weekly ×3

Commercial

2–4 lb/acre · per event

WHAT TO ACTUALLY EXPECT

WHAT TO EXPECT

Fast for a mineral. Not magic.

Fast for a mineral. Not magic.

The best results are ones you notice by their absence. The honest curve:

DAYS 1–5

WEEK 2–3

WEEK 4–6

HARVEST

The best results are ones you notice by their absence: the mildew that didn't take, the branch that didn't snap. The honest curve:
Title

DAYS 1–5

Turgor and color

Leaves hold up through the afternoon. Subtle, and easy to talk yourself out of.
Title

WEEK 2–3

New growth comes in harder

New tissue is the tissue with silicon in it. Stems feel stiffer.
Title

WEEK 4–6

Stress days stop costing you

A heat wave that cost you a week now costs you a day or two.
Title

HARVEST

Weight held up, not lost

Fruit that stayed on the plant instead of going to rot or breakage.

DAYS 1–5

Turgor and color

Leaves hold up through the afternoon. Subtle, and easy to miss.

WEEK 2–3

New growth comes in harder

New tissue is the tissue with silicon in it. Stems feel stiffer.

WEEK 4–6

Stress days stop costing you

A heat wave that cost you a week now costs you a day or two.

HARVEST

Weight held up, not lost

The gain is in what you didn't lose.

WHAT'S IN THE BAG

One ingredient, and the paperwork to prove it.

One ingredient, and the paperwork to prove it.

Volcanic mineral, mined and milled. Nothing else: no carriers, no anti-caking agents, no dye.

OMRI listed and CDFA registered, so certified organic growers can use it without a phone call. Every batch screened for heavy metals. Send us a lot number and we'll send the COA.

Volcanic mineral, mined and milled. Nothing else. OMRI listed, CDFA registered, every batch screened. Send a lot number, we'll send the COA.

OMRI LISTED

CDFA OIM

BATCH COA ON REQUEST

SPECIFICATION

SPECIFICATION · CONFIRM AGAINST LABEL

SOURCE

VOLCANIC MINERAL

VOLCANIC MINERAL DEPOSIT

PARTICLE SIZE

2–4 MICRONS

FORM

DRY MICRONIZED POWDER

pH IN SOLUTION

NEAR NEUTRAL

ALSO PROVIDES

Ca · Mg · TRACE ELEMENTS

Ca · Mg · TRACE

SHELF LIFE

INDEFINITE, KEPT DRY

ORIGIN

MILLED & BAGGED IN OREGON

OREGON

GROWER PROOF

What growers who used it actually said.

4.8

/ 5 · 61 REVIEWS

5

51

4

7

3

2

2

1

1

0

THE ONE-STAR RULE

We publish every review, including the bad ones. If a grower says it did nothing for them, you'll read it here rather than find it on Reddit.

"Watered it in on a Sunday and by the next weekend the tomatoes were standing up in the afternoon instead of flopping. First silica product where I could point at the change."

MICHAEL P. | MARKET GARDEN, OREGON

"Watered it in on a Sunday and by the next weekend the tomatoes were standing up in the afternoon instead of flopping."

MICHAEL P. · MARKET GARDEN, OREGON

"I'd sworn off silica after a potassium silicate product wrecked my reservoir pH. This one didn't move my pH at all."

NICOLE J. · INDOOR GROWER, MICHIGAN

"I'd sworn off silica after a potassium silicate product wrecked my reservoir pH. This one didn't move my pH at all, which is the only reason I kept using it."

NICOLE J. | INDOOR GROWER, MICHIGAN

SAME ROW · SAME WEEK · SIDE BY SIDE

SAME ROW · SAME WEEK

UNTREATED

6 WEEKS

ROOT ZONE · 6 WEEKS

WHY WE MADE THIS ONE

We built Root Zone because our own plants couldn't wait.

"A block went in late and it showed. So we milled a batch to dissolve faster and drenched the worst rows. By the next weekend you could see the line in the field."

"A block went in late and it showed. So we milled a batch to dissolve faster and drenched the worst rows. By the next weekend you could see the line in the field."

That batch became Root Zone. Same farm, same way.

That batch became Root Zone. Same farm, same way.

SILICA EARTH · THE FARM THAT MADE IT

EVERY REMAINING DOUBT

Answered here so you don't have to go looking.

If your question isn't here, a grower on our team answers. Not a chatbot, not a ticket queue.

Ask us anything

How is this different from the Minerals bag?

Same mineral, different job. Minerals feeds slowly all season; Root Zone goes into solution immediately at the root zone and releases bound phosphorus. Most growers eventually run both.

Will it spike my pH?

No. Potassium silicates sit at pH 10–12 and swing reservoirs. This is a near-neutral mineral, so no pH-down is needed and it is safe alongside your existing feed.

Will it clog my sprayer or drip?

At 2–4 microns it passes standard filtration and stays suspended with modest agitation. Pre-mix in a small volume first, keep agitation on long runs, rinse at the end.

How fast is "fast-acting", honestly?

Uptake starts with the first watering. Turgor changes in week one; structural benefits build over three to six weeks. Anyone promising 48 hours is selling something else.

Is it safe for my soil biology?

It feeds it. A near-neutral mineral doesn't sterilize anything, and better soil structure benefits the food web. For a biology focus, look at Silica + Microbes.

Which crops does it help?

Silicon accumulators most: grasses and cereals, cucurbits, tomatoes and peppers, strawberries, flowering crops, ornamentals and turf. Almost everything benefits from the stress-tolerance side.

Can I use it with my nutrients?

Yes. It isn't a fertilizer and doesn't replace your feed. Add it as its own step, not premixed into concentrated stock; in a reservoir, add it last.

How long will a bag last?

That depends on your application rate and how many plants you are feeding. Root Zone comes in 1 lb, 3 lb and 10 lb, so you can match the size to your grow. Kept dry and sealed, it doesn't expire.

Why does it sometimes run out mid-season?

We mill it in finite runs and won't stretch a batch with filler. In peak season a run can move in a few weeks, so buy the size you need up front rather than counting on a July re-order.

What if it does nothing for my plants?

Tell us and we'll make it right. Report anything damaged or missing within 3 days and we'll replace it, and unopened product can be returned within 30 days.

How is this different from the regular Volcanic Silica Minerals?

Same volcanic mineral, different job. The Minerals bag is formulated for steady, season-long availability. You put it in at transplant and it feeds slowly. Root Zone is milled and formulated so a larger fraction goes into solution immediately, and it's specifically aimed at the root zone and at releasing bound phosphorus. Most growers eventually run both: Root Zone when something needs fixing now, Minerals as the baseline underneath.

Will it spike my pH like potassium silicate did?

No. Potassium silicate concentrates sit around pH 10–12, which is why they swing reservoirs and can trigger magnesium lockout. This is a mineral, not a caustic silicate. It is near neutral in solution, needs no pH-down, and is safe alongside your existing feed. This is the single most common reason growers who quit silica come back to it.

Will the powder clog my sprayer or drip lines?

At 2–4 microns it passes through standard sprayer and drip filtration and stays suspended with modest agitation. Pre-mix in a small volume of water first rather than dumping it into a full tank, keep agitation running on long fertigation events, and rinse the line at the end as you would with any suspension. Commercial growers run it through drip and pivot systems routinely.

How fast is "fast-acting", honestly?

Uptake starts with the first watering after application. Visible turgor changes tend to show in the first week. Structural benefits such as stem stiffness, disease resistance and heat resilience build into new tissue over three to six weeks. Anyone promising a transformation in 48 hours is selling you something else. See the week-by-week timeline above.

Is it safe for my soil biology?

It feeds it rather than harms it. Unlike caustic silicates, a near-neutral mineral doesn't sterilize anything, and improved soil structure benefits the food web. If soil biology is your main focus, look at Silica + Beneficial Microbes, which adds Bacillus and mycorrhizal species on top of the mineral.

Which crops does it actually help?

Silicon accumulators benefit most: grasses and cereals, rice, sugarcane, cucurbits, tomatoes and peppers, strawberries, flowering crops, ornamentals and turf. Fruiting and flowering plants carrying heavy weight late in the season see the clearest structural payoff. Almost every crop benefits from the stress-tolerance side; the degree varies.

Can I use it with my existing nutrients?

Yes. It isn't a fertilizer and doesn't replace your feed program. Add it as its own step rather than premixing into a concentrated nutrient stock, and if you're running a reservoir, add it last. It works alongside synthetic and organic programs alike.

How long will a bag last me?

That depends on your application rate and how many plants you are feeding. Root Zone comes in three sizes, 1 lb, 3 lb and 10 lb, so you can match the size to your grow rather than buying more than you need. Kept dry and sealed, unused product doesn't expire.

Why does it sometimes run out mid-season?

Because we mill it in finite runs and won't stretch a batch with filler. In peak season a run can move in a few weeks. If you're planning a full season, buy the size you need up front rather than counting on a re-order in July.

What if it doesn't do anything for my plants?

Tell us and we'll make it right. Report anything damaged or missing within 3 days and we'll replace it, and unopened product can be returned within 30 days. We'll also ask what you grew and how you applied it, because that feedback is how the next batch gets better.

LAST THING

The plants you have now are the ones this helps.

Silicon builds into new tissue. Every week you wait is growth that goes in without it.

The plants you have now are the ones this helps.

Silicon builds into new tissue. Every week you wait is growth that goes in without it. $37.95 to start, and unopened bags go back within 30 days.

Add Root Zone

NOT READY TO BUY?

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Twelve pages on what silicon does and how to read a silica label. Free, no discount code attached.

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30-day returns

Unopened, within 30 days.

Unopened, within 30 days.

Grown, not sourced

Milled on our own farm.

Milled on our own farm.

A grower answers

Within one business day.

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Every order is one-time.

Silica Root Zone

$37.95

MILLED IN SMALL BATCHES

Silica Root Zone

$37.95
$37.95

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