Organic Azomite Powder Fertilizer 0-0-0.2 (Micronized)
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Greenway Biotech · Made in California since 1989
Azomite 0-0-0.2 Micronized.
Seventy trace minerals from a single ancient volcano.
An OMRI Listed mineral amendment mined from a single hydrated sodium calcium aluminosilicate (HSCAS) deposit in central Utah, formed roughly 30 million years ago when volcanic ash settled into a mineral-rich seabed. One bag delivers approximately 70 trace and ultra-trace elements — silica, calcium, magnesium, rare earths — that decades of intensive cropping and irrigation can leach from soil. Independently lab tested with heavy metal results consistently well below required limits.
Find your size → Calculate how much I need70+
Trace & ultra-trace elements in a single mineral
30Myrs
Volcanic seabed deposit — geological concentration
1.8% Ca
Plus 0.5% Mg and 0.2% K₂O on the guaranteed analysis
37yrs
Greenway Biotech, family-owned California since 1989
01 / Choose your size
Right-sized for the job.
Coverage estimates use the home-garden soil-prep rate (1 lb per 10 sq ft) as the planning anchor. Field-crop, lawn, and tree rates are higher per unit area — see Application Rates below for those use cases.
| Bag Size | Garden Coverage | Lawn Coverage | Best For |
|---|---|---|---|
| 2 lb | ~20 sq ft soil prep | ~600 sq ft maintenance | Small raised beds & houseplants |
| 5 lb | ~50 sq ft soil prep | ~1,500 sq ft maintenance | Most popular · Home gardens |
| 10 lb | ~100 sq ft soil prep | ~3,000 sq ft maintenance | Raised-bed gardens & orchards |
| 25 lb | ~250 sq ft soil prep | ~7,500 sq ft maintenance | Large gardens & small acreage |
| 44 lb | ~440 sq ft soil prep | 12,000–15,000 sq ft per application | Best value · Lawns & field crops |
02 / Ideal applications
One mineral.
Six different jobs.
Azomite is a long-cycle remineralizer — it supplies trace elements that NPK fertilizers don't address. Crop response is strongest where soils are mineral-depleted or where a soil test confirms low micronutrient status.
Tomatoes & Peppers
The best-studied crops for Azomite response. Peer-reviewed greenhouse and field trials have reported increased fruit number per plant when Azomite was added to the soil prep or applied in-row.
Vegetables & Flowers
Broadcast 1 lb per 10 sq ft into the top several inches of soil before planting. A practical inclusion when building beds from depleted or sandy soils.
Trees & Orchards
Apply annually under the drip line, scaled to trunk diameter (1 lb for small trees up to 15–40 lbs for mature specimens). May support older orchards on long-cropped ground.
Lawn & Turf
Use 2–3 lb per 1,000 sq ft for established lawns (Azomite Mineral Products turf guidance). One 44 lb bag covers 12,000–15,000 sq ft per application.
Greenhouse & Potting Mix
Blend 7–10 lb per cubic yard of potting mix at media prep. For finished containers, work 1 tsp per 2-inch pot diameter into the top inch and reapply quarterly.
Animal Feed Supplement
Azomite is also approved as a livestock and poultry feed supplement. Follow species-specific feed guidelines from your feed supplier or veterinarian; do not exceed label rates.
03 / Why Azomite
A single mineral.
A complete trace profile.
Macronutrients drive growth. Trace minerals drive the enzymes that make growth work. Azomite addresses the second half of that equation in one bag.
70+
Trace & ultra-trace elements in one product.
Azomite delivers approximately 70 trace mineral elements — silica, iron, manganese, zinc, boron, selenium, plus rare earth elements (lanthanides) not commonly found in standard organic or synthetic fertilizers. Read why major and trace elements both matter.
30Myrs
Geological concentration, not engineered blend.
The Utah deposit was formed when an ancient volcanic eruption deposited ash into a mineral-rich seabed roughly 30 million years ago. The result is a hydrated sodium calcium aluminosilicate (HSCAS) ore — a single rock that no blended fertilizer can replicate.
OMRI
Listed for certified organic production.
Azomite is OMRI Listed and meets the requirements of the USDA National Organic Program. Use it with confidence on certified organic operations — and verify your certifier's specific input requirements before applying.
−200mesh
Micronized for surface area.
Micronized Azomite is ground to approximately −200 mesh (around 75 microns), increasing surface area for contact with soil particles and microbial biology. Finer particle size supports more consistent broadcast distribution and faster interaction with soil chemistry than coarser grades.
pH 8
Effectively pH-neutral at typical rates.
Although Azomite itself measures around pH 8, adding it to soil at typical application rates does not significantly raise soil pH. Unlike dolomite lime or sulfur, Azomite is not used as a pH amendment — it sits alongside whatever liming program your soil already needs.
Tested
Independently lab tested for heavy metals.
Our Azomite is independently lab tested for heavy metal content with results consistently well below required limits. Third-party results are available in the Certificate of Analysis linked in Section 12.
04 / The science
Why trace minerals matter.
300+
Enzymatic reactions in plant metabolism that depend on trace mineral cofactors
Macronutrients — nitrogen, phosphorus, potassium, calcium, magnesium, sulfur — are the structural and energetic raw materials plants consume in measurable percentages of dry matter. Trace minerals are the cofactors. Iron, manganese, zinc, copper, boron, molybdenum, nickel, and dozens of ultra-trace elements each catalyze specific enzymatic reactions — chlorophyll synthesis, nitrogen fixation, hormone regulation, lignin formation, sugar transport. Without them, the macronutrient pool is biochemically inert.
The Azomite ore is hydrated sodium calcium aluminosilicate (HSCAS) — a complex silica matrix that holds its trace mineral inventory in a slow-release form. The fraction that is plant-available depends on soil pH, microbial activity, root exudates, and time. This is why Azomite is positioned as a soil-building amendment rather than a fast-correction product: in mineral-depleted soils, regular application over multiple seasons rebuilds the trace mineral pool the soil food web draws from.
The independent research literature is concentrated on tomato and pepper. Peer-reviewed greenhouse work at UC Berkeley / USDA-ARS reported statistically significant increases in fruit number per plant when Azomite was applied at 5% by weight in soil or 4.5 g per plant per month via drip (Mehlferber et al. 2022, Applied & Environmental Microbiology). A Colorado State University field trial on certified-organic pepper reported a 68% increase in red-fruit weight per plant at 100 lb/acre banded in-row, with response varying by cultivar (Uchanski & Mason, CSU Extension, 2017). For broadacre crops the published evidence base is narrower — the field rates published in this product page are manufacturer recommendations that fall within the range validated in the CSU work.
For a deeper read on the broader category, see The 5 Fertilizers That Will Also Encourage Soil Health and How Do Soil Microbes Affect Plant Health.
05 / Application rates
Pick your use.
Get your rate.
Rates below are drawn from peer-reviewed research (CSU Extension, UC Berkeley / USDA-ARS, Iranian Journal of Plant Physiology) and the Azomite Mineral Products manufacturer guidelines. The peer-reviewed evidence base is strongest on tomato and pepper — broadacre field rates are manufacturer recommendations validated within the CSU trial range. Always start with a soil test.
Home Garden, Raised Beds & Established Plantings
Quick answer: 1 lb per 10 sq ft tilled into the top 2–4 inches before planting. For established beds, sprinkle 1 tsp around each plant and water in.
| Use Case | Rate | Source | Notes |
|---|---|---|---|
| Bed soil prep (new or annual) | 1 lb per 10 sq ft | Azomite Mineral Products label | Broadcast, then till or rake to 2–4 inch depth before planting |
| Row application | 1 lb per 25 linear ft | Azomite Mineral Products label | Band along row before seeding or transplanting; lightly incorporate |
| Established plants & established beds | 1 tsp per plant | Azomite Mineral Products label | Sprinkle around base, work into top 1–2 inches with a hand cultivator |
| Tomato (greenhouse, soil-mixed) | 5% by weight at soil mix or transplant | Mehlferber et al. 2022 (Appl. Environ. Microbiol.) | Peer-reviewed; statistically significant increase in fruit number per plant |
| Roses & ornamental shrubs | 0.5–1 lb per plant | Azomite Mineral Products label | Till lightly into soil at the drip line; once per growing season |
Note: Azomite is a long-cycle remineralizer rather than a quick-fix product. Expect cumulative benefits over 2–3 growing seasons of regular application — most visible on soils that have been intensively cropped or irrigated for many years.
Sources: Azomite Mineral Products official application guidelines; Mehlferber et al. 2022 (Applied & Environmental Microbiology, UC Berkeley / USDA-ARS); Noorani Azad et al. 2016 (Iranian Journal of Plant Physiology).
Field Crops, Pasture & Commercial Production
Quick answer: 100–200 lbs/acre banded in-row for high-value vegetables; 150–300 lbs/acre broadcast for field crops on poor or depleted soils.
| Application Method | Rate | Source | Notes |
|---|---|---|---|
| Pepper, banded in-row (organic field trial) | 100 lb/acre | Uchanski & Mason, CSU Ext. (2017) | Peer-reviewed; +68% red-fruit weight per plant for 'Early Perfect Italian'. Most economically efficient rate in the trial. |
| Pepper, banded in-row (alternative cultivar) | 200 lb/acre | Uchanski & Mason, CSU Ext. (2017) | Peer-reviewed; best result for 'Stocky Red Roaster'. Response was cultivar-dependent — trial on a small block first. |
| Broadcast — high-value crops, poor soils | 150–300 lb/acre | Azomite Mineral Products label | Use the upper end on highly depleted ground. Incorporate before planting. |
| Banded application — row crops | 100 lb/acre | Azomite Mineral Products label | Concentrates the mineral in the root zone; more efficient than broadcast at lower rates. |
| In-row banded | 50 lb/acre | Azomite Mineral Products label | Lowest rate for tight in-row placement at planting. |
| Annual maintenance (established programs) | 50–100 lb/acre | Azomite Mineral Products label | Roughly half the initial broadcast rate; adjust per soil test. |
| Foliar / fertigation (micronized) | 3–5 lb/acre per application | Azomite Mineral Products label | Multiple applications per season; settling expected — see foliar note below. |
📋 Soil Test First: Field crop application rates above are general guidelines based on the manufacturer's published recommendations and the cultivar-dependent CSU pepper trial. Actual rates should be confirmed by a current soil test and consultation with your local cooperative extension service. The peer-reviewed Azomite literature does not yet provide robust dose-response data for corn, soybean, wheat, or alfalfa — trial on a small block before committing across a whole operation.
Sources: Uchanski & Mason, Colorado State University Extension (2017); Azomite Mineral Products official application guidelines; Mehlferber et al. 2022 (Applied & Environmental Microbiology).
Foliar / fertigation note: Azomite is largely insoluble regardless of particle size. The micronized grade can be suspended in irrigation water at 3–5 lb/acre, but expect settling in the reservoir — agitate before injection, run through screens larger than 80 mesh, and rinse lines after each application.
Trees, Orchards, Citrus & Vines
Quick answer: Scale to trunk diameter — 1 lb for small trees, up to 15–40 lb for mature specimens. Apply annually under the drip line.
| Tree / Vine Category | Rate | Source | Notes |
|---|---|---|---|
| Trunk < 3 inches | 1 lb per tree | Azomite Mineral Products label | Apply under drip line; lightly work into top 1–2 inches |
| Trunk 3–7 inches | 2–4 lb per tree | Azomite Mineral Products label | Spread evenly from trunk to drip-line edge |
| Trunk 7–12 inches | 5–10 lb per tree | Azomite Mineral Products label | Annual application; water in thoroughly |
| Trunk 12–20 inches | 10–15 lb per tree | Azomite Mineral Products label | Distribute as a light surface coating across full drip line |
| Trunk > 20 inches | 15–40 lb per tree | Azomite Mineral Products label | Mature specimens; double the rate on declining trees |
| Citrus, fruit & vines (established) | 1–5 lb annually per tree/vine | Azomite Mineral Products label | Under drip line; depends on tree size |
| Grapes (per plant) | 0.5–1 lb per vine | Azomite Mineral Products label | Lightly till into soil at the base |
Note: Apply as a light surface coating from the trunk to the drip-line edge — that's where active feeder roots concentrate. Avoid mounding against the trunk. Double the rate for trees in obvious decline, but verify the decline isn't a pH, drainage, or pest issue first.
Source: Azomite Mineral Products official application guidelines.
Lawn, Turf & Sports Fields
Quick answer: 2–3 lb per 1,000 sq ft for established lawns, once per year. One 44 lb bag covers approximately 12,000–15,000 sq ft per application.
| Turf Type | Rate | Source | Notes |
|---|---|---|---|
| Established lawn (residential) | 2–3 lb per 1,000 sq ft, once per year | Azomite Mineral Products label | Equivalent to 1 × 44 lb bag per 12,000–15,000 sq ft |
| Golf course, sports turf, commercial | 2–3 lb per 1,000 sq ft, once per year | Azomite Mineral Products turf guidance | Water in after application; ideal pre-aeration timing |
| New lawn (pre-seeding or pre-sod) | Heavier rate, tilled into soil | Azomite Mineral Products label | Build the mineral pool into the rooting zone before establishment |
| Foliar / fertigation (micronized) | 0.07–0.11 lb per 1,000 sq ft as needed | Azomite Mineral Products label | Low-rate suspension; agitate and pre-filter |
Note: Avoid applying in high-wind conditions to limit dust dispersion. Water in thoroughly after application to settle the powder and prevent foot-traffic tracking. For best results, time the application to coincide with aeration or top-dressing.
Source: Azomite Mineral Products official turf application guidelines.
Containers, Houseplants & Greenhouse Media
Quick answer: 7–10 lb per cubic yard of potting mix at media prep. For finished containers, 1 tsp per 2-inch pot diameter mixed into the top inch; reapply 1 tsp quarterly.
| Use Case | Rate | Source | Notes |
|---|---|---|---|
| Potting mix preparation | 7–10 lb per cubic yard | Azomite Mineral Products label | Blend thoroughly into the bulk media before filling containers |
| Houseplants (initial) | 1 tsp per 2-inch pot diameter | Azomite Mineral Products label | Mix into the top inch of soil at planting |
| Houseplants (maintenance) | 1 tsp per pot, quarterly | Azomite Mineral Products label | Top-dress and lightly scratch into the surface; water in |
| Greenhouse tomato (peer-reviewed drip) | ~1 g per plant per application (monthly cycle of ~4.5 g/plant/month) | Mehlferber et al. 2022 (Appl. Environ. Microbiol.) | Delivered at base of plant via drip; ultrafine grade preferred for suspension |
Note: Micronized Azomite settles in still water. For drip and reservoir delivery in greenhouse systems, the ultra-fine grade is preferred — see Azomite Ultra-Fine. Some settling will still occur; agitate before injection.
Sources: Azomite Mineral Products official application guidelines; Mehlferber et al. 2022 (Applied & Environmental Microbiology, UC Berkeley / USDA-ARS).
06 / How to use & calculate
Broadcast.
Incorporate.
Water in.
Azomite works through soil contact — surface broadcasts that aren't worked in or watered will sit dormant. Three steps move it into the active root zone.
-
01
Calculate & weigh
Use the calculator to translate your area, row length, plant count, or trunk diameter into a pound figure. Weigh out the right amount rather than relying on volume — Azomite's bulk density varies with packing.
-
02
Broadcast evenly
Spread by hand for small areas, with a calibrated drop or broadcast spreader for larger ones. A dust mask is recommended when broadcasting more than a few pounds in still air — particle size is fine enough to airborne easily.
-
03
Incorporate & water
Till or rake into the top 2–4 inches of soil for new beds, or work into the top 1–2 inches with a hand cultivator for established plantings. Water thoroughly afterward to start mineral contact with soil biology.
-
04
NOT a hydroponic reservoir nutrient
Micronized Azomite is largely insoluble — it will settle in standing reservoirs. For hydroponic systems, the ultra-fine grade is the right choice and some settling should still be expected. Azomite is also not a substitute for a balanced NPK program; pair it with a complete fertilizer.
07 / Compare
Six soil-building inputs.
Different jobs.
Azomite is a broad-spectrum trace mineral source. Most other soil amendments target one or two specific nutrients or one specific soil chemistry problem. Combine them based on what your soil test shows.
| Product | Primary Function | N-P-K | Best For | Notes |
|---|---|---|---|---|
| Azomite Micronized (this product) | ~70 trace & ultra-trace elements | 0-0-0.2 | Long-cycle remineralization, depleted soils, organic systems | OMRI Listed; not a primary NPK source |
| Azomite Ultra-Fine | Same mineral profile, finer particle size | 0-0-0.2 | Hydroponic reservoirs, liquid suspensions, drip injection | Some settling expected; agitate before use |
| Dolomite Lime | Raises pH; adds Ca and Mg | 0-0-0 (22% Ca, 11% Mg) | Acidic soils, Ca/Mg deficiency, pH correction | Active pH amendment — Azomite is not |
| Gypsum (Calcium Sulfate) | Improves soil structure; adds Ca and S without changing pH | 0-0-0 (~22% Ca, ~17% S) | Clay soils, sodium-affected soils, structure problems | Pair with Azomite in compacted soils |
| Kelp Meal | Hormones + K + trace minerals from marine source | 2-0-4 | Vigorous establishment, root health, organic programs | Different trace profile than Azomite — complementary |
| Epsom Salt (Magnesium Sulfate) | Fast-acting Mg + S | 0-0-0 (10% Mg, 13% S) | Acute, confirmed Mg deficiency — soil or foliar correction | Faster than Azomite for Mg-only problems |
08 / Decision
Is this the right
amendment for you?
Azomite is a long-cycle, broad-spectrum soil builder. It is not a quick correction tool and it is not a primary fertilizer. Match it to the right use case.
Best Choice For
- Soils depleted by years of intensive cropping or irrigation with minimal mineral input
- Gardens where plants show unexplained deficiencies despite adequate N-P-K
- Organic growers needing an OMRI Listed broad-spectrum trace mineral source
- Tomato and pepper growers — the most peer-reviewed crops for Azomite response
- Fruit and vegetable gardeners looking to improve mineral density over multiple seasons
- Turf and ornamental programs where long-term remineralization is the goal
- Container and greenhouse media programs needing a trace mineral component
Consider Another Product If
- You need a primary NPK fertilizer — Azomite supplies 0-0-0.2; pair with blood meal or bone meal for the macros
- You have acute, confirmed iron deficiency — Chelated Iron EDTA 13% corrects it within days
- You have acute, confirmed magnesium deficiency — Epsom Salt works faster as a foliar or soil correction
- You need a pH correction — try Dolomite Lime (raises pH) or sulfur (lowers pH); Azomite is essentially pH-neutral
- You're running a fully soluble hydroponic system — use Azomite Ultra-Fine with the caveat that some settling is unavoidable
- Your soil test shows micronutrient levels already at or above sufficiency — more Azomite won't help and may shift mineral balance
09 / Build the program
Azomite supplies the trace minerals.
These complete the program.
A balanced organic fertility program typically pairs Azomite with a primary nitrogen source, a phosphorus source, and pH or structure amendments as the soil test requires.
K + hormones
Kelp Meal 2-0-4
Marine-derived potassium with plant growth hormones (cytokinins, auxins) and a different trace mineral profile than Azomite. The two are complementary, not redundant.
Phosphate + CaBone Meal 3-15-0
High-phosphorus organic amendment for root and flower development, with 24% calcium. Pair with Azomite for macros + trace minerals from organic sources.
Fast nitrogenBlood Meal 13-0-0
Fast-release organic nitrogen for vigorous vegetative growth. A complete organic program needs nitrogen, phosphorus, and a trace mineral supplement — Azomite is the third leg.
Soil structureGypsum (Calcium Sulfate)
Improves structure in clay or compacted soils without affecting pH. Combine with Azomite where compaction or sodium is limiting root access to the trace mineral pool.
10 / Safety & handling
Read this before
you broadcast.
Azomite is a natural mineral product, not acutely toxic at typical application rates. The main hazard is fine dust during handling.
- Wear an N95 dust mask or respirator when broadcasting more than a few pounds in still air. Safety glasses are recommended in windy conditions.
- Store in a sealed bag or container in a cool, dry location away from moisture, direct sunlight, and incompatible materials (strong acids, oxidizers). Out of reach of children and pets not intended for mineral supplementation.
- Avoid applying in high-wind conditions to limit dust dispersion. Do not apply to aquatic environments or near water bodies — mineral runoff can shift aquatic chemistry. Water in after application.
- Follow recommended rates — higher is not more effective and may shift soil mineral balance. When used as an animal feed supplement, follow species-specific feed guidelines.
- First aid: inhalation — move to fresh air; eye contact — flush with clean water for 15 minutes; skin contact — wash with soap and water; ingestion — rinse mouth and contact Poison Control (1-800-222-1222) if a large quantity is ingested. See SDS for full details.
11 / FAQ
Common questions.
Honest answers.
If your question isn't here, contact our team at questions@greenwaybiotech.com.
What is Azomite and where does it come from?
Azomite is a naturally mined mineral product from a single geological deposit in central Utah, USA. It is a hydrated sodium calcium aluminosilicate (HSCAS) — a complex silica ore formed roughly 30 million years ago when an ancient volcanic eruption deposited ash into a mineral-rich seabed. Over geological time, that material accumulated approximately 70 trace and ultra-trace elements. The name stands for "A to Z Of Minerals Including Trace Elements." It is mined and processed without chemical alteration.
Is Azomite approved for certified organic production?
Yes. Our Azomite Micronized is OMRI Listed for use in certified organic production and meets the standards of the USDA National Organic Program. It is also registered with the appropriate state agricultural departments as a soil amendment. Always verify your specific certifier's requirements if you are seeking certification for your operation.
What's the difference between micronized and ultra-fine Azomite?
Both grades come from the same Utah deposit and carry the same mineral profile. The difference is particle size. Micronized Azomite is ground to approximately −200 mesh — fine enough for even broadcast distribution and quick soil contact, suited to garden, field, and lawn applications. Ultra-fine is finer still and is preferred for liquid suspensions, drip injection, and hydroponic reservoir use, though some settling is unavoidable because Azomite is largely insoluble at any particle size. For more on how it fits an organic program, see The Organic Gardener's Guide to Soil Preparation.
What does the peer-reviewed research actually say about Azomite?
The independent literature is concentrated on tomato and pepper. A UC Berkeley / USDA-ARS greenhouse study (Mehlferber et al. 2022, Applied & Environmental Microbiology) reported statistically significant increases in fruit number per tomato plant when Azomite was applied at 5% by weight in soil or ~4.5 g per plant per month via drip. A Colorado State University certified-organic pepper field trial (Uchanski & Mason, CSU Extension 2017) reported a 68% increase in red-fruit weight per plant at 100 lb/acre banded in-row, with response varying by cultivar. Pot work on tomato under drought stress (Noorani Azad et al. 2016, Iranian J. Plant Physiology) reported improved biomass and chlorophyll at 25–100 g/pot. For broadacre crops, robust dose-response data is not yet published — manufacturer rates fall within the range validated in the CSU work.
Can I apply too much Azomite?
While Azomite is a natural mineral product, applying well above recommended rates is not more effective and may shift soil mineral balance in unintended ways. Follow the rates in the Application Rates section. For broadcast maintenance, 50–100 lb/acre or proportional home-garden rates are typically sufficient annually. If you are unsure whether to apply at all, a soil test will help guide both the decision and the rate.
Will Azomite change my soil pH?
Azomite has a measured pH around 8, but adding it to soil at typical rates does not significantly raise soil pH. It is not a pH amendment. If your soil is acidic and you need to raise pH, use dolomite lime instead; if alkaline and you need to lower pH, use elemental sulfur. Azomite sits alongside whichever liming program your soil already needs.
What trace minerals does Azomite contain?
The guaranteed analysis on the registered label is Soluble Potash (K₂O) 0.2%, Calcium 1.8%, and Magnesium 0.5%. Beyond the guaranteed analysis, Azomite contains approximately 70 trace and ultra-trace elements — silica, iron, manganese, zinc, boron, selenium, and numerous rare earth elements (lanthanides). For the complete elemental breakdown, see the Certificate of Analysis linked in the Documents section. For a deeper read on why trace minerals matter, see Major Elements vs. Trace Elements: Why Your Plants Need Both.
Is Azomite safe around children and pets?
Azomite is a natural mineral product and is not acutely toxic at typical application rates. The primary handling concern is inhalation of fine dust — keep children and pets off treated areas until the powder has been watered in or incorporated into soil. Store bags securely. As an animal feed ingredient, Azomite has been approved for livestock and poultry use under species-specific guidelines; that is a separate application from horticultural use.
Can Azomite be used in raised beds, containers, or potting mixes?
Yes. For raised beds, use 1 lb per 10 sq ft tilled into the top several inches at bed prep. For potting mix preparation in bulk, blend 7–10 lb per cubic yard of media. For finished containers and houseplants, mix 1 tsp per 2-inch pot diameter into the top inch of soil at planting, and reapply 1 tsp per pot quarterly. Many gardeners report cumulative benefits over multiple growing seasons. For broader soil-prep context, see The 5 Fertilizers That Will Also Encourage Soil Health.
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