PRODUCT 04 · THE SPEED PLAY

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 — and it unlocks phosphorus your soil already holds.

4.8  61 grower reviews
$37.95
$44.95
SAVE 16%
 
1 · CHOOSE YOUR SIZE
2 · HOW OFTEN
 
Title

Free shipping over $75

In by 2pm PT ships today

30-day guarantee — CONFIRM

Free shipping over $75 · flat $8.95 under

Orders in by 2pm PT ship the same business day

30-day grow-it-and-see guarantee — CLIENT TO CONFIRM

Milled and bagged on our own farm in Northern California

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. The number next to the cart is real.

Batch 24-B is on the shelf now. Last spring's run went in 19 days. No fake countdown here — the number next to the cart is the real one. At zero it becomes a waitlist.

Not sure between this and the season-long bag? Compare all four. 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 — CONFIRM AGAINST CURRENT LABEL RATES AND RETAIL PRICES BEFORE LAUNCH

.

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 colour

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 colour

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.

DON'T BUY THIS IF

Three reasons to close this tab.

We'd rather lose the sale than take money it won't help.

You're looking for a fertiliser

This isn't NPK. It makes your feed work harder — but a hungry plant needs food first.

This isn't NPK. It makes your feed work harder — but a hungry plant needs food first.

You're three days from harvest

You're three days from harvest

Silicon builds into new tissue. At the end of a cycle there's nothing left to build.

Silicon builds into new tissue. At the end of a cycle there's nothing left to build. Start at transplant.

You want one bag to do everything

Root Zone is the targeted option. Want one bag and no thinking? Take the Bio-Activator.

Root Zone is the targeted option. Want one bag and no thinking? Take the Bio-Activator.

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

HEMP STARTS · SALEM, OR

"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

HEMP STARTS · SALEM, OR

"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

"Four stars because I couldn't tell much in the first two weeks and nearly gave up. By week five the stem thickness was obvious."

ROBERT D. · HOME GARDENER, NORTH CAROLINA

"Four stars because I couldn't tell much in the first two weeks and nearly gave up. By week five the difference in stem thickness was obvious. Wish the label said that plainly."

ROBERT D. | HOME GARDENER, NORTH CAROLINA

SAME ROW · SAME WEEK · SIDE BY SIDE

SAME ROW · SAME WEEK

UNTREATED

6 WEEKS

ROOT ZONE · 6 WEEKS

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 MICRONISED POWDER

pH IN SOLUTION

NEAR NEUTRAL

ALSO PROVIDES

Ca · Mg · TRACE ELEMENTS

Ca · Mg · TRACE

SHELF LIFE

INDEFINITE, KEPT DRY

ORIGIN

MILLED & BAGGED IN CALIFORNIA

CALIFORNIA

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 the phone. 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 — no pH-down needed, 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 sterilise 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 fertiliser 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?

The 2 lb pouch covers about a season for a ten-plant home grow — around 24 applications. 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 — 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 — the 30-day guarantee.

CLIENT TO CONFIRM EXACT GUARANTEE TERMS.

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 — near neutral in solution, no pH-down needed, and 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 — stem stiffness, disease 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 sterilise 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 fertiliser and doesn't replace your feed programme. 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 programmes alike.

How long will a bag last me?

At the standard rate, the 2 lb pouch covers roughly a season for a home grow of about ten plants — around 24 applications. Eight pounds suits a large garden or a small market operation for a season; 40 lb is the commercial sack. 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 — or set up a season refill, which reserves your bag from the run before it goes on general sale.

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

Tell us and we'll make it right — that's the 30-day guarantee, and we'd rather refund you than argue. We'll also ask what you grew and how you applied it, because that feedback is how the next batch gets better. 

CLIENT TO CONFIRM EXACT GUARANTEE TERMS.

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 for a season's worth, refunded if it does nothing.

Add Root Zone

NOT READY TO BUY?

Take the Silica 101 guide instead.

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

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

Thanks for subscribing

30-day guarantee

Refund within 30 days.

Refund within 30 days.

30-day guarantee

Refund within 30 days.

Grown, not sourced

Milled on our own farm.

Milled on our own farm.

A grower answers

A grower replies, same day.

No subscription traps

Cancel anytime, one click.

Root Zone · 2 lb

$37.95

ONLY 38 LEFT IN THIS BATCH

Root Zone · 2 lb

$37.95
$37.95

Add to cart