Grow Green 4-2-6 Concentrate – Complete Vegetative N‑P‑K
- Regular Price
- $ 27.99
- Sale Price
- $ 27.99
- Regular Price
- $ 27.99
Sold Out
- Unit Price
- per
Greenway Biotech · Made in California since 1989
Grow Green 4-2-6.
The vegetative-stage formula in the 4-part system.
A CDFA-registered, water-soluble 4-2-6 powder concentrate engineered as the nitrogen-and-potassium driver in the Greenway 4-part hydroponic program. Higher nitrogen and elevated potash than typical 2-1-6 liquid grow formulas, with no chelation interference because micros stay in their own bottle. Third-party lab tested with heavy-metal results consistently well below required limits.
Find your size → Calculate how much I need4%
Nitrate-N — double typical 2-1-6 liquid grow formulas
6%
Soluble potash (K₂O) for stem strength & canopy density
50–70%
Typical cost savings vs. equivalent liquid nutrients
35+yrs
Family-owned, California-made since 1989
01 / Choose your size
Right-sized for the reservoir.
Each package mixes into one gallon of stock solution at 1.7 lbs per gallon — so the bag size sets your total stock yield. Stock yield x typical 5–15 ml/gal reservoir dose gives the finished-solution coverage below.
| Bag Size | Stock Solution Yield | Reservoir Coverage* | Best For |
|---|---|---|---|
| 1.7 lb | 1 gal concentrate | ~250–750 gal finished | Single small reservoir or trial |
| 3.4 lb | 2 gal concentrate | ~500–1,500 gal finished | Most popular |
| 8.5 lb | 5 gal concentrate | ~1,250–3,750 gal finished | Multi-room home grow or small commercial |
| 17 lb | 10 gal concentrate | ~2,500–7,500 gal finished | Best value |
*Reservoir coverage range assumes a 5 ml/gal early-veg dose at the high end and a 15 ml/gal peak-veg dose at the low end. Heavy-feeding programs use the lower coverage end; lighter programs the higher end.
02 / Ideal applications
One formula.
Every veg-stage crop.
Grow Green is the N-and-K driver during the vegetative phase across crop types. Pair with Cal-Mag Plus, Micro Green, and Blossom Green for the complete program. Suggested veg-stage starting rates below.
Leafy Greens
Lettuce, kale, chard, basil and similar fast-growing leafies. Typical veg-stage dose: 5–10 ml/gal reservoir.
Tomatoes & Peppers
Heavy nitrogen feeders during early frame-building. Typical veg-stage dose: 10–15 ml/gal — taper as flowering approaches.
Culinary Herbs
Basil, mint, parsley, cilantro. Aromatic herbs respond well to steady nitrogen at 5–10 ml/gal during active growth.
Cucumbers & Melons
Vine crops that build large leaf canopy before fruit set. Typical veg-stage dose: 10–15 ml/gal reservoir.
Strawberries
Used during runner establishment and crown development. Typical pre-flower dose: 5–10 ml/gal — switch to Strawberry 8-12-32 at flowering.
Flowers & Ornamentals
Foliar plants and bedding annuals during their growing-out phase. Typical dose: 10–15 ml/gal. Shift to Blossom Green 2-6-8 at bud set.
03 / Why Grow Green
Double the N.
Higher K. Lower bill.
A focused macronutrient formula built for the vegetative phase — where heavy-feeding hydro crops actually demand more nitrogen and potassium than typical liquid grow blends deliver.
4%
Twice the nitrogen of typical 2-1-6 liquid formulas.
Nitrate-N drives chlorophyll synthesis, amino acid production, and rapid cell division. At 4% N, Grow Green can hit the same target ppm-N at a lower dose — or push growth rates harder at the same dose. Less product to ship, less to store, less to mix.
6%
Elevated potash for stem strength & canopy density.
Soluble potash (K₂O) governs stomatal regulation, water transport, and cell wall integrity. The 6% K₂O level can support thicker stems and the structural development that determines how much fruit weight a plant can carry into flowering and harvest.
0micros
NPK-only — no chelation interference.
Grow Green contains macronutrients only. Keeping micros in a separate product (Micro Green 2-0-3) avoids the pH-driven precipitation and chelation competition that can occur when iron, calcium, and phosphorus share a bottle. Adjust each part independently per stage and crop.
50–70%
Typical cost savings vs. equivalent liquid programs.
A powder concentrate means you pay for nutrients, not water and plastic. Across most reservoir sizes and feeding schedules, growers switching from a comparable liquid nutrient line report a substantial reduction in finished-solution cost per gallon.
∞shelf
Indefinite dry shelf life.
The dry powder doesn't separate, degrade, or precipitate in the container. Sealed stock solutions remain stable for 6+ months when stored cool and dark. No more discarding expired liquid bottles.
CDFA
State-registered and third-party lab tested.
Registered with the California Department of Food and Agriculture. Independently tested for heavy metal content with results consistently well below required limits. Lot-to-lot elemental ratios verified before release.
04 / The science
Why a powder beats a pre-mixed liquid for veg.
4-2-6NPK
N : available phosphate (P₂O₅) : soluble potash (K₂O)
Most liquid grow formulas are sold at roughly 2-1-6 — a ratio tuned to minimize input cost at the manufacturing level. The plants don't care about manufacturing economics. During the vegetative phase, fast-growing hydro crops take up more nitrogen and more potassium than a 2-1-6 dilution typically delivers at conventional reservoir doses. Grow Green doubles the nitrogen and keeps the potash elevated to match the demand, not the spreadsheet.
The macronutrients come from refined mineral salts — potassium nitrate as the dual N+K source, monopotassium phosphate (MKP) for available phosphate plus chloride-free potassium, potassium sulfate for additional K and sulfur, and magnesium sulfate as a background Mg+S contribution. Each component contributes a known, repeatable EC value to the reservoir, which makes dialing in target electrical conductivity straightforward — and which is why batch-to-batch behavior stays consistent rather than drifting the way mined raw materials sometimes do.
Keeping the micronutrients in a separate bottle isn't a marketing distinction; it's chemistry. Iron, calcium, and phosphorus held together at concentration can precipitate or compete for the same chelating sites. By moving the trace elements into Micro Green 2-0-3 and the calcium into Cal-Mag Plus 2-0-0, every part can sit at concentration without fighting itself in the bottle. The grower adjusts each part to the stage and crop instead of being locked into a fixed ratio.
For deeper coverage of the underlying nutrient roles, see The Function of Nitrogen in Plants, The Function of Potassium in Plants, and our overview of choosing the best hydroponic fertilizers.
05 / Application rates
Pick your stage.
Get your rate.
All rates are ml of Grow Green stock solution per gallon of reservoir water. Stock solution = 1.7 lbs Grow Green per 1 gallon water. Pair every reservoir with the full 4-part program (Cal-Mag → Micro → Grow → Blossom → pH last).
Stock Solution Preparation
Quick answer: Dissolve the entire package at 1.7 lbs per gallon of warm water (65–75°F) for a 1-gallon stock concentrate that lasts 6+ months sealed.
Mixing the entire package at once is the simplest way to keep concentration uniform. Store in a cool, dark place and shake before each use — some settling is normal in a saturated solution.
| Product | Powder → Water | Stock Yield | Shelf Life |
|---|---|---|---|
| Cal-Mag Plus 2-0-0 | 2.5 lbs → 1 gallon | 1 gallon concentrate | 6+ months sealed |
| Grow Green 4-2-6 | 1.7 lbs → 1 gallon | 1 gallon concentrate | 6+ months sealed |
| Micro Green 2-0-3 | 1.5 lbs → 1 gallon | 1 gallon concentrate | 6+ months sealed |
| Blossom Green 2-6-8 | 1.8 lbs → 1 gallon | 1 gallon concentrate | 6+ months sealed |
| Package Size | Water Needed | Stock Solution Yield |
|---|---|---|
| 1.7 lbs | 1 gallon | 1 gallon concentrate |
| 3.4 lbs | 2 gallons | 2 gallons concentrate |
| 8.5 lbs | 5 gallons | 5 gallons concentrate |
| 17 lbs | 10 gallons | 10 gallons concentrate |
Source: Stock solution concentrations and shelf life figures reflect the Greenway Biotech 4-part hydroponic system protocol as documented on the registered CDFA product labels for Grow Green, Cal-Mag Plus, Micro Green, and Blossom Green.
Complete 4-Part Feeding Schedule
Quick answer: Doses below are ml of each part per gallon of reservoir water. Always add in order: Cal-Mag → Micro → Grow → Blossom → pH last.
| Growth Stage | Cal-Mag Plus | Grow Green | Micro Green | Blossom Green | EC Target |
|---|---|---|---|---|---|
| Seedlings / Clones Week 1–2 |
2.5 | 1.25 | 1.25 | 1.25 | 0.5–0.8 |
| Early Vegetative Week 3–4 |
5 | 5 | 5 | 5 | 1.0–1.4 |
| Late Vegetative Week 5–6 |
7.5 | 15 | 10 | 5 | 1.4–1.8 |
| Transition Week 7–8 |
10 | 10 | 10 | 10 | 1.6–2.0 |
| Early Bloom Week 9–10 |
10 | 5 | 10 | 15 | 1.8–2.2 |
| Peak Bloom Week 11–13 |
10 | 0 | 10 | 20 | 2.0–2.5 |
| Late Bloom / Flush Week 14+ |
5 | 0 | 7.5 | 15 | 1.5–2.0 |
Source: Rates reflect the Greenway Biotech 4-part hydroponic system protocol developed for the Grow Green, Cal-Mag Plus, Micro Green, and Blossom Green product family. EC stage-target ranges are consistent with greenhouse vegetable nutrient guidance from University of Florida IFAS (HS796) and Cornell Controlled Environment Agriculture Program. Actual results vary by crop type, water source, temperature, and system; monitor EC and pH daily during peak veg and bloom.
Application by System Type
Quick answer: Grow Green dissolves cleanly in every common hydroponic system. Match the application method to your system; the reservoir dose stays the same.
| System Type | Application Method | Special Considerations |
|---|---|---|
| DWC / RDWC | Add to reservoir | Change weekly, monitor pH daily |
| NFT / Aeroponics | Continuous feed | Filter solution, check emitters regularly |
| Ebb & Flow | Flood cycles | Adjust concentration for flood frequency |
| Drip / Drain-to-Waste | Multiple daily feeds | 10–20% runoff recommended |
| Coco / Soilless | Daily feeding | Never let media dry completely |
Source: System-type guidance reflects general hydroponic practice consistent with Cornell Controlled Environment Agriculture Program and University of Arizona Controlled Environment Agriculture Center reference material. Adjust runoff percentages and feed frequency to local conditions.
06 / How to use & calculate
Mix once.
Add in order.
Measure and adjust.
The 4-part system is forgiving once the mixing order is right. The wrong order is the single most common cause of cloudy reservoirs and locked-out nutrients — calcium and phosphate together form an insoluble precipitate.
-
01
Make your Grow Green stock solution.
Fill a clean container with 1 gallon of warm water (65–75°F). Slowly add 1.7 lbs (full package) of Grow Green and stir until completely dissolved. Label with the date and store cool and dark.
-
02
Add to the reservoir in order.
Start with plain water at the right volume. Add Cal-Mag Plus first and stir. Then Micro Green, then Grow Green at your stage rate, then Blossom Green if used. Never combine concentrates directly before dilution — use separate stock tanks and add each independently.
-
03
Adjust EC, then pH.
Check EC against the stage target in the schedule. If high, top off with plain water rather than reducing nutrient rates. Once EC is on target, adjust pH last to 5.5–6.5 (lower end for fruiting, upper end for leafies).
-
04
Taper toward bloom.
Don't drop Grow Green abruptly at flower set. Run a 1–2 week transition where Grow Green and Blossom Green are dosed at similar rates (around 10 ml/gal each), then taper Grow Green down as Blossom Green takes over. Helps reduce the nitrogen-crash yellowing that often shows up at the stretch phase.
07 / Compare
Powder concentrate vs.
pre-mixed liquid systems.
A category-level comparison. The numbers below are typical ranges; exact figures vary by brand, formulation, and where in the country the bottles are shipping from. See our guide to choosing hydroponic fertilizers for the longer breakdown.
| Feature | Greenway 4-Part Powder | Typical 3-part Pre-Mixed Liquids |
|---|---|---|
| Format (this product) | Concentrated dry powder, separate parts | Pre-mixed liquid in bottles |
| Typical finished-solution cost | Often a fraction of liquid pricing per gallon | Baseline (varies widely by brand) |
| Shelf Life | Indefinite dry; 6+ months as stock solution | 1–2 years sealed; degrades after opening |
| Shipping Weight | ~7 lbs for the full 4-part system | ~25+ lbs for a comparable liquid trio |
| Heavy Metals | 3rd-party tested; results well below required limits | Disclosure varies by brand |
| State Registration | CDFA registered | Varies by state and brand |
| Cal-Mag Included | Included as the first part of the system | Typically a separate add-on purchase |
| Manufacturing | Made in California, family-owned since 1989 | Varies (US, Canada, EU) |
08 / Decision
Is Grow Green
the right grow part?
Grow Green is built for the vegetative stage of a 4-part program. It is not the right choice for every reservoir or every gardener — here's where it fits, and where to look elsewhere.
Best Choice For
- Any hydroponic system during the seedling, cloning, or vegetative growth stage
- Heavy-nitrogen-demand crops: tomatoes, cucumbers, peppers, fast-growing leafies
- Growers switching from pre-mixed liquid lines who want substantially lower finished-solution cost
- Commercial operations that need CDFA documentation and consistent lot-to-lot ratios
- RO water programs where calcium and magnesium are supplemented separately via Cal-Mag Plus
Consider Another Product If
- You're already at peak bloom — switch to Blossom Green 2-6-8
- You want a one-part crop-specific formula with built-in micros — try Tomato 4-18-38, Strawberry 8-12-32, or Cucumber 8-16-36
- You're growing in an OMRI / organic program — Grow Green is a synthetic mineral formula; see Organic Fertilizers
- You need the entire 4-part system in one purchase — the 4-Part Hydroponic Bundle ships all four parts together
09 / Build the program
Grow Green is part one.
These complete the program.
Grow Green works best as the N-and-K driver inside the full 4-part system. Each companion below covers a distinct role across the seedling-to-harvest cycle.
Calcium + Mg + Fe
Cal-Mag Plus 2-0-0
Foundation of every reservoir. Calcium, magnesium, and chelated iron — always added first to prevent calcium-phosphate precipitation. Critical for RO water and coco coir.
Trace ElementsMicro Green 2-0-3
Complete 7-element micronutrient blend with chelated minerals. Used throughout every growth stage — micros catalyze macro uptake.
FloweringBlossom Green 2-6-8
High-phosphorus, high-potash bloom formula. Ramps up as you taper Grow Green during the transition to flowering.
Complete Kit4-Part Hydroponic Bundle
All four parts together. Makes roughly 4 gallons of stock solution and treats up to ~400 gallons of finished nutrient solution. The simplest way to start the full program.
10 / Safety & handling
Read this before
you mix.
Grow Green is a concentrated mineral-salt powder. Standard fertilizer-handling PPE applies. Refer to the SDS for complete handling guidance.
- Wear chemical-resistant gloves and safety glasses when handling concentrated powder or stock solutions; mix in a well-ventilated area or use a dust mask
- Store dry powder sealed in its original container in a cool, dry location away from direct sunlight; store stock solutions in opaque sealed containers; keep out of reach of children and pets
- Never combine concentrates directly together — always dilute each in water individually before combining in the reservoir; mixing order matters (Cal-Mag → Micro → Grow → Blossom → pH last)
- Use separate stock tanks for calcium fertilizers and other concentrated fertilizer salts; jar-test unfamiliar combinations before injecting in commercial systems
- First aid — eye contact: flush with clean water 15 min, seek medical attention if irritation persists; skin contact: wash with soap and water; ingestion: do not induce vomiting, rinse mouth, contact Poison Control (1-800-222-1222); inhalation: move to fresh air, seek medical attention if symptoms persist
11 / FAQ
Common questions.
Honest answers.
If your question isn't here, contact our team at questions@greenwaybiotech.com.
Can Grow Green replace my liquid grow nutrient?
Yes. Match the ppm-N of your current liquid product using the feeding schedule, and you'll typically see equal or better results at a fraction of the finished-solution cost. Because Grow Green's nitrogen concentration (4%) is roughly double that of typical 2-1-6 liquids, you'll use less product to hit the same target EC. See our guide to the best hydroponic fertilizers for the longer breakdown.
Do I still need a micro formula when using Grow Green?
Yes — Grow Green provides only macronutrients (N, available phosphate, soluble potash, plus background Mg and S). You must pair it with Micro Green 2-0-3 to supply chelated trace elements (iron, manganese, zinc, copper, boron, molybdenum). The separation allows you to adjust micros independently based on your water source and crop type.
Why is the mixing order (Cal-Mag first) so important?
Calcium and phosphate can form an insoluble precipitate (calcium phosphate) when mixed directly together at concentration. Adding Cal-Mag Plus to plain water first — before any phosphate-containing nutrient — keeps that reaction from happening in the reservoir. The order is Cal-Mag → Micro Green → Grow Green → Blossom Green → pH adjustment last. Always dilute each part independently before combining.
How does the 4-2-6 ratio compare to standard 2-1-6 liquid formulas?
Grow Green carries roughly double the nitrogen (4% vs. 2%) and slightly higher phosphate compared to typical 2-1-6 liquid grow formulas. That means you use less product to hit the same ppm-N target, which is where the cost savings start to compound. The higher nitrogen also supports faster vegetative growth for heavy feeders like tomatoes, cucumbers, and peppers.
Can I use Grow Green in soil or coco coir?
Yes. For soil, use the early-vegetative rate (about 5 ml/gal of stock solution) and water in when the top inch of soil is dry. For coco coir, follow the hydroponic schedule — coco requires daily watering and should never fully dry out. In both cases, check runoff EC periodically to prevent salt accumulation in containers.
How long does Grow Green stock solution last?
Sealed stock solutions stored in an opaque container in a cool, dark place typically remain stable for 6+ months. The dry powder itself has an effectively indefinite shelf life when kept dry and sealed. Always shake stock solutions before use — minor settling is normal. Cloudy stock typically means hard water; use RO or distilled water for stock preparation when possible.
What's the best way to transition from vegetative to bloom?
Run a 1–2 week transition rather than switching abruptly. During weeks 7–8, dose both Grow Green and Blossom Green at similar rates (around 10 ml/gal each). Then drop Grow Green to 5 ml/gal in early bloom while increasing Blossom Green to 15 ml/gal. By peak bloom (week 11+), Grow Green drops to 0 and Blossom Green carries the program. The gradual shift can help reduce the nitrogen-crash yellowing that sometimes appears at the stretch phase. For a walkthrough, see growing hydroponic tomatoes.
Is Grow Green compatible with other manufacturers' nutrients?
Grow Green is formulated to work in balance with Cal-Mag Plus, Micro Green, and Blossom Green. Mixing concentrated fertilizer salts from different manufacturers without testing can cause precipitation and nutrient lockout — always jar-test unfamiliar combinations at full concentration before injecting into a production reservoir.
Ready to feed?
Pick your bag. We'll ship it.
Available in 1.7 lb, 3.4 lb, 8.5 lb, and 17 lb packages — from single-reservoir trial sizes to small-commercial volumes. Free shipping on orders over $100. 90-day money-back guarantee.
Choose your size →