Ancient Ocean Mineral Deposit
Best Organic Greensand (0-0-3): Slow-Release Potassium, Iron, Manganese & 30+ Trace Minerals from 70-Million-Year-Old Ocean Deposits Buy on Old Cobblers Farm
Old Cobblers Farm™ Wicked Organics Greensand
by Wicked Organics — Littleton, NH
0-0-3
N-P-K Ratio
"The longest-acting soil amendment in the Wicked Organics lineup. Glauconite releases potassium and trace minerals over months to years while physically improving soil structure — loosening clay, binding sand, and increasing cation exchange capacity permanently."
30+
Trace Minerals
3%
Potassium (K₂O)
Multi-year
Release Duration
4 Sizes
5, 10, 15, 20 lbs
70-Million-Year-Old Ocean Minerals
Glauconite formed on ancient sea floors, concentrating potassium, iron, manganese, silica, and 30+ trace minerals over geological time. A single mineral source with extraordinary mineral diversity.
Multi-Year Slow Release
Greensand releases potassium and trace minerals over months to years — not days or weeks. Apply once and it continues improving soil fertility for multiple growing seasons.
Physical Soil Improvement
Greensand loosens heavy clay soils by improving structure and drainage, while also helping sandy soils retain moisture and nutrients. Physical and chemical improvement in one product.
3% Potassium + Iron + Manganese
Low but sustained potassium delivery alongside iron for chlorophyll production and manganese for enzyme activation. The slow drip of trace nutrition that soil tests rarely capture.
Increases CEC
Glauconite has high cation exchange capacity — it holds nutrients in the soil and releases them to plant roots over time. Permanently improves your soil's ability to store and deliver nutrition.
Heavy Application Rates
5–10 lbs per 100 sq ft for garden beds, up to 25 lbs per 1,000 sq ft for lawns. Greensand is used in volume — think soil building, not quick feeding.
Organic & Mined Naturally
Greensand is a naturally occurring mineral — no processing, no chemicals, no manufacturing. Mined and applied directly. Approved for organic production.
Trusted by 20,000+ Growers
Developed in Littleton, New Hampshire. Sold nationwide on Amazon, Walmart, eBay, and theoldcobblersfarm.com.
| NPK Ratio | 0-0-3 |
| Derived From | Glauconite (90–94%), Manganese Dioxide (3–5%) |
| Item Form | Granular sand |
| Release Speed | Very slow-release (months to years) |
| Application Rate | 5–10 lbs / 100 sq ft (beds) | 25 lbs / 1,000 sq ft (lawns) |
| Method | Broadcast and work into top 4" of soil |
| Frequency | 1x per season or as long-term soil amendment |
| Sizes | 5 lb | 10 lb | 15 lb | 20 lb |
| Supports | All plants — vegetables, flowers, trees, shrubs, lawns, clay soil improvement |
| Setups | Garden beds, raised beds, containers, lawns, orchards, clay soil remediation |
What We Love
✓ 30+ trace minerals from ancient ocean glauconite deposits
✓ Multi-year slow release — apply once, benefit for seasons
✓ Physically improves both clay and sandy soils
✓ Permanently increases soil cation exchange capacity
✓ 100% natural mineral — organic approved, no processing required
Worth Noting
— Very low NPK — not a primary fertilizer, use as long-term amendment
— Heavy application rates — 5 lb bag covers only 50–100 sq ft
Buy on Old Cobblers Farm →
Available in 5 lb | 10 lb | 15 lb | 20 lb
| Feature | Old Cobblers Farm™ Wicked Organics Greensand | Espoma Organic Greensand Soil Conditioner | Down To Earth Organic Greensand Fertilizer | Organically Done Greensand 0-0-7 | Soil Mender Texas Greensand | Soil Sunrise Greensand Soil Additive | Lancaster Agriculture Greensand 20 lbs | Super Greensand Micronized (68 Minerals) | Espoma Organic Greensand Soil Conditioner | Down To Earth Organic Greensand Fertilizer | Organically Done Greensand 0-0-7 | Soil Mender Texas Greensand | Soil Sunrise Greensand Soil Additive | Lancaster Agriculture Greensand 20 lbs | Super Greensand Micronized (68 Minerals) | Organic Greensand | Greensand Soil Conditioner | Greensand Soil Additive | Natural Greensand Fertilizer | Greensand Natural Fertilizer | Super Greensand Micronized | Super Greensand (Micronized) | Greensand | Greensand Soil Additive | Greensand Fertilizer | Organic Greensand | Texas Greensand | Greensand Meal | Greensand | Greensand | Potash (0-0-60) | Rock Dust |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| NPK | 0-0-3 | 0-0-0.1 | 0-0-0 | 0-0-7 | 0-0-1 | Not listed | Not listed | 0-0-0.2 | 0-0-0.1 | 0-0-0 | 0-0-7 | 0-0-1 | Not listed | Not listed | 0-0-0.2 | 0-0-3 | 0-0-0.1 | N/A (glauconite) | 2000-1-6 | N/A (glauconite) | 0-0-0.2 | 0-0-0.2 | 0-0-3 | 0-0-3 | 2000-1-6 | 2000-1-6 | 0-0-3 | 0-0-3 | 0-0-0 | 0-0-0 | 0-0-60 | 0-0-0.2 |
| Phosphorus | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 1.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 1.0% | 1.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% |
| Potassium | 3.0% | 0.1% | 0.0% | 7.0% | 1.0% | 0.0% | 0.0% | 0.2% | 0.1% | 0.0% | 7.0% | 1.0% | 0.0% | 0.0% | 0.2% | 3.0% | 0.1% | 0.0% | 6.0% | 0.0% | 0.2% | 0.2% | 3.0% | 3.0% | 6.0% | 6.0% | 3.0% | 3.0% | 0.0% | 0.0% | 60.0% | 0.2% |
| Form | Granular sand | Granular (pelletized) | Granular | Granular | Granular | Granular | Granular | Fine powder (micronized) | Granular (pelletized) | Granular | Granular | Granular | Granular | Granular | Fine powder (micronized) | |||||||||||||||||
| Sizes | 5 lb | 10 lb | 15 lb | 20 lb | 6 lb | 7.5 lb | 10 lb | 30 lb | 36 lb | 5 lb | 25 lb | 50 lb | 7 lb | 22 lb | 44 lb | 5 lb | 40 lb | 1 lb | 2 lb | 5 lb | 5 lb | 20 lb | 10 lb | 30 lb | 44 lb | 6 lb | 7.5 lb | 10 lb | 30 lb | 36 lb | 5 lb | 25 lb | 50 lb | 7 lb | 22 lb | 44 lb | 5 lb | 40 lb | 1 lb | 2 lb | 5 lb | 5 lb | 20 lb | 10 lb | 30 lb | 44 lb | 5 lb, 25 lb | 5 lb, 10 lb | 5 lb | 20 lb | 5 lb, 40 lb | 5 lb | 36 lb | 5 lb | 40 lb | 5 lb | |||||||
| Release Speed | Very slow-release (months to years) | Very slow (years) | Very slow (years) | Very slow (years) | Very slow (years) | Very slow (years) | Very slow (years) | Slow-moderate (faster than standard due to micronization) | Very slow (years) | Very slow (years) | Very slow (years) | Very slow (years) | Very slow (years) | Very slow (years) | Slow-moderate (faster than standard due to micronization) |
The Competition
Espoma Organic Greensand Soil Conditioner
by Espoma
— Millville, NJ
0-0-0.1
N-P-K
FormGranular (pelletized)
Sizes6 lb | 7.5 lb | 10 lb | 30 lb | 36 lb
Price~$14-22 (7.5 lb)
Per Unit~$1.90-2.50/lb
IngredientsGreensand (glauconite) mined from New Jersey deposits
OrganicOMRI registered organic input
App. Rate5-30 lbs per 100 sq ft
CoverageNot listed
Best ForAll gardens, lawns, trees, shrubs, containers
ClaimsHighest quality all-natural greensand; non-burning; since 1929; solar-powered facility; 30+ trace minerals
Legacy NJ brand. Widest size range (6 sizes). Pelletized for easier spreading. But only 0.1% soluble potash listed. Total potash ~6%.
Down To Earth Organic Greensand Fertilizer
by Down To Earth
— Eugene, OR
0-0-0
N-P-K
FormGranular
Sizes5 lb | 25 lb | 50 lb
Price~$14-17 (5 lb) / ~$35 (25 lb)
Per Unit~$2.80-3.40/lb
IngredientsGreensand (glauconite)
OrganicYes — OMRI + CDFA Listed
App. Rate5-10 lbs per 100 sq ft
CoverageNot listed
Best ForGardens, lawns, trees, containers
ClaimsOMRI + CDFA certified; absorbs 1/3 its weight in water; used since 1700s; no synthetics or fillers
Dual OMRI+CDFA certification is strongest in category. Premium brand. But no NPK listed and higher price per lb than Espoma.
Organically Done Greensand 0-0-7
by Organically Done
— Whitmore Lake, MI
0-0-7
N-P-K
FormGranular
Sizes7 lb | 22 lb | 44 lb
Price~$32.99 (7 lb)
Per Unit~$4.71/lb
IngredientsGreensand (glauconite)
OrganicUSDA NOP compliant (not OMRI)
App. RateNot listed
CoverageNot listed
Best ForAll gardens, lawns, containers
ClaimsHighest potash (7%); nutrients never expire; chemical burn worry free; NOP compliant; family business
Highest labeled K at 0-0-7. Michigan family business. But premium priced and no OMRI cert. Limited reviews.
Soil Mender Texas Greensand
by Soil Mender / Back to Earth
— Texas
0-0-1
N-P-K
FormGranular
Sizes5 lb | 40 lb
Price~$15-18 (5 lb)
Per Unit~$3.00-3.60/lb
IngredientsTexas-sourced greensand (glauconite)
OrganicYes — OMRI + CDFA
App. Rate3-40 lbs per 100 sq ft depending on use
CoverageNot listed
Best ForLawns, gardens, soil conditioning
ClaimsTexas-sourced; 10x moisture absorption vs sand; OMRI + CDFA; rebranded to Back to Earth Organics
Unique Texas source. Good OMRI+CDFA certs. 10x moisture claim. But limited size options and regional brand.
Soil Sunrise Greensand Soil Additive
by Soil Sunrise
— USA
Not listed
N-P-K
FormGranular
Sizes1 lb | 2 lb | 5 lb
Price~$16-19 (5 lb)
Per Unit~$3.20-3.80/lb
IngredientsGreensand (glauconite)
OrganicNot confirmed
App. RateNot listed
CoverageNot listed
Best ForContainer gardening, indoor plants
ClaimsContainer gardening focus; multi-channel (Amazon/Lowes/Walmart); resealable bag
Targets container/indoor growers specifically. Good positioning but small sizes only and no NPK or organic cert listed.
Lancaster Agriculture Greensand 20 lbs
by Lancaster Agriculture
— Lancaster, PA
Not listed
N-P-K
FormGranular
Sizes5 lb | 20 lb
Price~$16-22 (5 lb) / ~$30-38 (20 lb)
Per Unit~$1.50-1.90/lb (20 lb)
IngredientsGreensand
OrganicNot confirmed
App. RateNot listed
CoverageNot listed
Best ForGardens, lawns
ClaimsSince 1988; regenerative agriculture; rich in potassium and iron
Newer Amazon entrant. Good per-lb pricing on 20 lb bag. But limited reviews and no certifications listed.
Super Greensand Micronized (68 Minerals)
by Super Greensand
— USA
0-0-0.2
N-P-K
FormFine powder (micronized)
Sizes10 lb | 30 lb | 44 lb
Price~$25-30 (10 lb)
Per Unit~$2.50-3.00/lb
IngredientsMicronized greensand (glauconite)
OrganicYes — OMRI Listed
App. Rate2-5 lbs per 100 sq ft
CoverageNot listed
Best ForAll gardens, compost, soil building
Claims68 minerals; micronized for faster availability; 10% total potash; OMRI listed
Premium micronized product. Faster nutrient availability than standard greensand. But higher price and niche distribution (KiS Organics).
Espoma Organic Greensand Soil Conditioner
by Espoma
— Millville, NJ
0-0-0.1
N-P-K
FormGranular (pelletized)
Sizes6 lb | 7.5 lb | 10 lb | 30 lb | 36 lb
Price~$14-22 (7.5 lb)
Per Unit~$1.90-2.50/lb
IngredientsGreensand (glauconite) mined from New Jersey deposits
OrganicOMRI registered organic input
App. Rate5-30 lbs per 100 sq ft
CoverageNot listed
Best ForAll gardens, lawns, trees, shrubs, containers
ClaimsHighest quality all-natural greensand; non-burning; since 1929; solar-powered facility; 30+ trace minerals
Legacy NJ brand. Widest size range (6 sizes). Pelletized for easier spreading. But only 0.1% soluble potash listed. Total potash ~6%.
Down To Earth Organic Greensand Fertilizer
by Down To Earth
— Eugene, OR
0-0-0
N-P-K
FormGranular
Sizes5 lb | 25 lb | 50 lb
Price~$14-17 (5 lb) / ~$35 (25 lb)
Per Unit~$2.80-3.40/lb
IngredientsGreensand (glauconite)
OrganicYes — OMRI + CDFA Listed
App. Rate5-10 lbs per 100 sq ft
CoverageNot listed
Best ForGardens, lawns, trees, containers
ClaimsOMRI + CDFA certified; absorbs 1/3 its weight in water; used since 1700s; no synthetics or fillers
Dual OMRI+CDFA certification is strongest in category. Premium brand. But no NPK listed and higher price per lb than Espoma.
Organically Done Greensand 0-0-7
by Organically Done
— Whitmore Lake, MI
0-0-7
N-P-K
FormGranular
Sizes7 lb | 22 lb | 44 lb
Price~$32.99 (7 lb)
Per Unit~$4.71/lb
IngredientsGreensand (glauconite)
OrganicUSDA NOP compliant (not OMRI)
App. RateNot listed
CoverageNot listed
Best ForAll gardens, lawns, containers
ClaimsHighest potash (7%); nutrients never expire; chemical burn worry free; NOP compliant; family business
Highest labeled K at 0-0-7. Michigan family business. But premium priced and no OMRI cert. Limited reviews.
Soil Mender Texas Greensand
by Soil Mender / Back to Earth
— Texas
0-0-1
N-P-K
FormGranular
Sizes5 lb | 40 lb
Price~$15-18 (5 lb)
Per Unit~$3.00-3.60/lb
IngredientsTexas-sourced greensand (glauconite)
OrganicYes — OMRI + CDFA
App. Rate3-40 lbs per 100 sq ft depending on use
CoverageNot listed
Best ForLawns, gardens, soil conditioning
ClaimsTexas-sourced; 10x moisture absorption vs sand; OMRI + CDFA; rebranded to Back to Earth Organics
Unique Texas source. Good OMRI+CDFA certs. 10x moisture claim. But limited size options and regional brand.
Soil Sunrise Greensand Soil Additive
by Soil Sunrise
— USA
Not listed
N-P-K
FormGranular
Sizes1 lb | 2 lb | 5 lb
Price~$16-19 (5 lb)
Per Unit~$3.20-3.80/lb
IngredientsGreensand (glauconite)
OrganicNot confirmed
App. RateNot listed
CoverageNot listed
Best ForContainer gardening, indoor plants
ClaimsContainer gardening focus; multi-channel (Amazon/Lowes/Walmart); resealable bag
Targets container/indoor growers specifically. Good positioning but small sizes only and no NPK or organic cert listed.
Lancaster Agriculture Greensand 20 lbs
by Lancaster Agriculture
— Lancaster, PA
Not listed
N-P-K
FormGranular
Sizes5 lb | 20 lb
Price~$16-22 (5 lb) / ~$30-38 (20 lb)
Per Unit~$1.50-1.90/lb (20 lb)
IngredientsGreensand
OrganicNot confirmed
App. RateNot listed
CoverageNot listed
Best ForGardens, lawns
ClaimsSince 1988; regenerative agriculture; rich in potassium and iron
Newer Amazon entrant. Good per-lb pricing on 20 lb bag. But limited reviews and no certifications listed.
Super Greensand Micronized (68 Minerals)
by Super Greensand
— USA
0-0-0.2
N-P-K
FormFine powder (micronized)
Sizes10 lb | 30 lb | 44 lb
Price~$25-30 (10 lb)
Per Unit~$2.50-3.00/lb
IngredientsMicronized greensand (glauconite)
OrganicYes — OMRI Listed
App. Rate2-5 lbs per 100 sq ft
CoverageNot listed
Best ForAll gardens, compost, soil building
Claims68 minerals; micronized for faster availability; 10% total potash; OMRI listed
Premium micronized product. Faster nutrient availability than standard greensand. But higher price and niche distribution (KiS Organics).
Organic Greensand
by Down To Earth
0-0-3
N-P-K
Price$14–$18 / 6 lb
**DTE Greensand (0-0-3) is the exact match.** Espoma's Greensand appears to be discontinued/reformulated. NPK registrations vary widely because most potash in glauconite is insoluble slow-release. The greensand market has fewer branded competitors than other amendments.
Greensand Soil Conditioner
by Espoma
0-0-0.1
N-P-K
Price$15–$18 / 7.5 lb
**DTE Greensand (0-0-3) is the exact match.** Espoma's Greensand appears to be discontinued/reformulated. NPK registrations vary widely because most potash in glauconite is insoluble slow-release. The greensand market has fewer branded competitors than other amendments.
Greensand Soil Additive
by Soil Sunrise
N/A (glauconite)
N-P-K
Price$15–$18 / 5 lb
**DTE Greensand (0-0-3) is the exact match.** Espoma's Greensand appears to be discontinued/reformulated. NPK registrations vary widely because most potash in glauconite is insoluble slow-release. The greensand market has fewer branded competitors than other amendments.
Natural Greensand Fertilizer
by Gardener's Supply Co.
2000-1-6
N-P-K
Price$20–$25 / 5 lb
**DTE Greensand (0-0-3) is the exact match.** Espoma's Greensand appears to be discontinued/reformulated. NPK registrations vary widely because most potash in glauconite is insoluble slow-release. The greensand market has fewer branded competitors than other amendments.
Greensand Natural Fertilizer
by Lancaster Agriculture
N/A (glauconite)
N-P-K
Price$15–$18 / 5 lb
**DTE Greensand (0-0-3) is the exact match.** Espoma's Greensand appears to be discontinued/reformulated. NPK registrations vary widely because most potash in glauconite is insoluble slow-release. The greensand market has fewer branded competitors than other amendments.
Super Greensand Micronized
by Grow Organic
0-0-0.2
N-P-K
Price$35–$45 / 44 lb
**DTE Greensand (0-0-3) is the exact match.** Espoma's Greensand appears to be discontinued/reformulated. NPK registrations vary widely because most potash in glauconite is insoluble slow-release. The greensand market has fewer branded competitors than other amendments.
Super Greensand (Micronized)
by Planet Natural
0-0-0.2
N-P-K
Price$35–$45 / 44 lb
**DTE Greensand (0-0-3) is the exact match.** Espoma's Greensand appears to be discontinued/reformulated. NPK registrations vary widely because most potash in glauconite is insoluble slow-release. The greensand market has fewer branded competitors than other amendments.
Greensand
by Down To Earth
0-0-3
N-P-K
Sizes5 lb, 25 lb
Price$14.99
OrganicOMRI, CDFA
Greensand Soil Additive
by Soil Sunrise
0-0-3
N-P-K
Sizes5 lb, 10 lb
Price$23.99
OrganicNatural
Greensand Fertilizer
by Gardeners Supply
2000-1-6
N-P-K
Sizes5 lb
Price$29.99
OrganicNatural
Organic Greensand
by Lancaster Ag
2000-1-6
N-P-K
Sizes20 lb
Price$36.95
OrganicOrganic
Texas Greensand
by Alis Organics
0-0-3
N-P-K
Sizes5 lb, 40 lb
Price$16.35
OrganicOMRI, CDFA
Greensand Meal
by Grow Organic
0-0-3
N-P-K
Sizes5 lb
Price$14.99
OrganicOMRI, CDFA
Greensand
by Espoma
0-0-0
N-P-K
Sizes36 lb
Price$45.00
OrganicNatural
Greensand
by Hoffman
0-0-0
N-P-K
Sizes5 lb
Price$18.99
OrganicNatural
Potash (0-0-60)
by Sunshine Harvest
0-0-60
N-P-K
Sizes40 lb
Price$62.98
OrganicSynthetic
Rock Dust
by Azomite
0-0-0.2
N-P-K
Sizes5 lb
Price$31.53
OrganicOMRI
70-Million-Year-Old Ocean Minerals
Glauconite formed on ancient sea floors, concentrating potassium, iron, manganese, silica, and 30+ trace minerals over geological time. A single mineral source with extraordinary mineral diversity.
Multi-Year Slow Release
Greensand releases potassium and trace minerals over months to years — not days or weeks. Apply once and it continues improving soil fertility for multiple growing seasons.
Physical Soil Improvement
Greensand loosens heavy clay soils by improving structure and drainage, while also helping sandy soils retain moisture and nutrients. Physical and chemical improvement in one product.
3% Potassium + Iron + Manganese
Low but sustained potassium delivery alongside iron for chlorophyll production and manganese for enzyme activation. The slow drip of trace nutrition that soil tests rarely capture.
Common Questions
