All Cronk Nutrients feeding charts (Classic 3-Part, Bonnie and Clyde Autoflower, PuurOrganics) with the correct mixing order, pH targets, and EC ranges for soil, coco, and hydro.

<p>Every Cronk feeding chart lives here, along with the mixing order and pH targets you need to get the most out of your feed.</p><p>Pick your line below, grab the chart, and use the mixing order and pH section to make sure you&apos;re building your reservoir correctly.</p><h2 id="downloadable-feeding-charts-pdf">Downloadable feeding charts (PDF)</h2><p><strong>Classic 3-Part system</strong></p><ul><li>&#x1F4CA; Classic Line mL per Gallon &#x2014; <a href="https://cdn.shopify.com/s/files/1/0843/6527/9543/files/3-Part_Nutrient_System_Feed_Program_Imperial_April_2024.pdf?v=1776460957" target="_blank" rel="noopener noreferrer">Download PDF</a></li><li>&#x1F4CA; Classic Line mL per Liter &#x2014; <a href="https://cdn.shopify.com/s/files/1/0843/6527/9543/files/3-Part_Nutrient_System_Feed_Program_Metric_April_2024.pdf?v=1776460957" target="_blank" rel="noopener noreferrer">Download PDF</a></li></ul><p><strong>Bonnie and Clyde (Autoflower line)</strong></p><ul><li>&#x26A1; Autoflower mL per Gallon &#x2014; <a href="https://cdn.shopify.com/s/files/1/0843/6527/9543/files/Autoflower-Nutrient-System-Feed-Program-Soil-Imperial.pdf?v=1776460962" target="_blank" rel="noopener noreferrer">Download PDF</a></li><li>&#x26A1; Autoflower mL per Liter &#x2014; <a href="https://cdn.shopify.com/s/files/1/0843/6527/9543/files/Autoflower-Nutrient-System-Feed-Program-Soil-Metric.pdf?v=1776460962" target="_blank" rel="noopener noreferrer">Download PDF</a></li></ul><p><strong>PuurOrganics line</strong></p><ul><li>&#x1F33F; PuurOrganics mL per Gallon &#x2014; <a href="https://cdn.shopify.com/s/files/1/0843/6527/9543/files/PuurOrganics_Soil_Feed_Chart_2025_5e8a2bc0-ca93-418b-8f78-3ec6b681b96b.png?v=1754507895" target="_blank" rel="noopener noreferrer">Download PDF</a></li></ul><h2 id="recommended-ec-and-ppm-targets">Recommended EC and PPM targets</h2><p>Use these as starting points. Runoff EC/PPM tells you whether to push harder or back off.</p><table><thead><tr><th>Growth stage</th><th>EC (mS/cm)</th><th>PPM 500 scale</th><th>PPM 700 scale</th><th>Notes</th></tr></thead><tbody><tr><td>Seedling</td><td>0.4 to 0.8</td><td>200 to 400</td><td>280 to 560</td><td>Keep it gentle, skip most additives</td></tr><tr><td>Vegetative</td><td>1.2 to 1.8</td><td>600 to 900</td><td>840 to 1260</td><td>Add CalMag if you&apos;re on RO or coco</td></tr><tr><td>Flower</td><td>1.8 to 2.4</td><td>900 to 1200</td><td>1260 to 1680</td><td>Introduce Bud Booster and Sticky Bandit</td></tr><tr><td>Flush</td><td>0.8 to 1.2</td><td>400 to 600</td><td>560 to 840</td><td>Plain water or pH-adjusted rinse</td></tr></tbody></table><h2 id="ph-targets-by-grow-medium">pH targets by grow medium</h2><p>Different mediums need different pH. Don&apos;t guess:</p><table><thead><tr><th>Medium</th><th>Range</th><th>Target</th><th>Key rule</th></tr></thead><tbody><tr><td>Soil</td><td>6.0 to 7.0</td><td>6.3 to 6.8</td><td>Soil buffers well, a little drift is fine</td></tr><tr><td>Coco</td><td>5.5 to 6.5</td><td>5.8 to 6.2</td><td>Hard cap at 6.5. Above that, iron and phosphorus lock out</td></tr><tr><td>Hydro (DWC, NFT, drip)</td><td>5.5 to 6.5</td><td>5.8 to 6.0</td><td>Let it drift across the range. Don&apos;t pin it to one number</td></tr><tr><td>Living soil (PuurOrganics)</td><td>6.2 to 7.0</td><td>6.5</td><td>Don&apos;t pH your feed water. Trust the soil biology</td></tr></tbody></table><h2 id="classic-3-part-mixing-order">Classic 3-Part mixing order</h2><p>Mix one product at a time. Stir thoroughly between steps. This order is non-negotiable because silica polymerizes if it hits concentrated salts, and beneficial bacteria die if they meet acids.</p><ol><li><strong>Armadillo Armour</strong> (if using). Always first, always to plain water. Stir 30 seconds, wait 5 minutes before adding anything else. This applies even when you&apos;re on RO water.</li><li><strong>CalMag</strong>. Stir 30 seconds, wait 2 minutes. Especially important if you&apos;re running RO, coco, or LEDs.</li><li><strong>Micro</strong>. Always before Grow and Bloom. Stir 1 minute. Micro contains calcium, and calcium has to dissolve cleanly before phosphorus arrives or you get calcium-phosphate precipitate.</li><li><strong>Grow</strong> and <strong>Bloom</strong>. Stir between each. Your ratio depends on growth stage (veg is higher Grow, flower is higher Bloom).</li><li><strong>Additives</strong> &#x2014; Bud Booster, Sticky Bandit. Stir between each.</li><li><strong>Adjust pH</strong> to the target for your medium (see the pH table above).</li><li><strong>Monkey Juice</strong> (if using). Always last, always AFTER pH adjustment. The acids used to adjust pH will kill the beneficial bacteria if you add Monkey Juice first.</li></ol><p>The whole sequence takes about 10 to 15 minutes. Rushing it is the most common reason feeds come out wrong.</p><h2 id="bonnie-and-clyde-autoflower-mixing-order">Bonnie and Clyde (Autoflower) mixing order</h2><p>Same rules apply. Silica first, Monkey Juice last. You use either Bonnie or Clyde depending on life stage, never both in the same feeding.</p><ol><li><strong>Armadillo Armour</strong> (if using). Plain water, stir 30 seconds, wait 5 minutes.</li><li><strong>CalMag</strong>. Stir 30 seconds, wait 2 minutes.</li><li><strong>Bonnie</strong> (veg stage) OR <strong>Clyde</strong> (flower stage). Never mix both in the same feed. Bonnie is your veg nutrient, Clyde is your flower nutrient. Switch when the plant transitions.</li><li><strong>Additives</strong> &#x2014; Bud Booster (flower only), Sticky Bandit. Stir between each.</li><li><strong>Adjust pH</strong> to the target for your medium.</li><li><strong>Monkey Juice</strong> (if using). Always last, always after pH.</li></ol><h2 id="puurorganics-mixing-order">PuurOrganics mixing order</h2><p>PuurOrganics is a 5-part organic base plus optional additives. The standard mixing order is:</p><ol><li><strong>Armadillo Armour</strong> (if using). Plain water, stir 30 seconds, wait 5 minutes. Armadillo Armour is one of three Cronk additives that work with PuurOrganics.</li><li><strong>PuurNitro</strong>. Stir 30 seconds.</li><li><strong>PuurPhos</strong>. Stir 30 seconds.</li><li><strong>PuurK</strong>. Stir 30 seconds.</li><li><strong>PuurCalMag</strong>. Stir 30 seconds.</li><li><strong>PuurBalance</strong>. Stir 30 seconds.</li><li><strong>Sticky Bandit</strong> (if using, flower stage). Stir 30 seconds.</li><li><strong>Adjust pH</strong>. For living soil with PuurOrganics, we generally recommend not pH-ing the feed water at all. Let the soil biology buffer. If you&apos;re running PuurOrganics in a non-living setup, target 6.0 to 6.5.</li><li><strong>Monkey Juice</strong> (if using). Always last, always after any pH adjustment.</li></ol><p><strong>Do NOT add Bud Booster or regular CalMag to a PuurOrganics feed.</strong> Both are synthetic and aren&apos;t a fit for an organic system. Use PuurK and PuurPhos to control your PK, and use PuurCalMag for calcium and magnesium.</p><h3 id="puurorganics--ro-water-special-case">PuurOrganics + RO water special case</h3><p>If you&apos;re running PuurOrganics on RO water, use this modified procedure to prevent calcium-phosphate precipitation:</p><ol><li>Pre-mix the full dose of PuurCalMag in a separate cup with a small amount of water. Stir until dissolved. Set aside.</li><li>In your main container, add Armadillo Armour first (if using), wait 5 minutes.</li><li>Add PuurNitro, PuurPhos, PuurK one at a time, stirring between each.</li><li>Slowly drizzle the pre-mixed PuurCalMag into the main container while stirring continuously. Don&apos;t dump it in all at once.</li><li>Add PuurBalance, stir.</li><li>Add Sticky Bandit if using, stir.</li><li>Adjust pH if needed.</li><li>Add Monkey Juice last if using.</li></ol><p>The pre-mix step gives the calcium time to fully dissolve and buffer before it meets the phosphorus, which is what prevents the precipitation you&apos;d otherwise see on RO water.</p><h2 id="pro-tips-for-using-the-feed-charts">Pro tips for using the feed charts</h2><ul><li><strong>Start at half strength</strong> if you&apos;re using new media, new genetics, or autoflowers. Ramp up as the plant responds.</li><li><strong>Monitor runoff EC and pH</strong>. Runoff tells you what&apos;s actually getting to the roots, not what went in.</li><li><strong>Alternate feed and plain water</strong> if you see salt buildup or coco starts to drift high.</li><li><strong>Mix fresh</strong>. You can store mixed solution up to 10 days in a sealed container, but stir before each use. Monkey Juice mixes are best used same day because the bacteria populations shift.</li><li><strong>Protect your bottles</strong>. Keep them capped, out of direct sunlight, and at room temperature. Liquid nutrients don&apos;t love heat or freeze cycles.</li></ul><h2 id="frequently-asked-questions">Frequently asked questions</h2><h3 id="why-does-armadillo-armour-go-first-even-with-ro-water">Why does Armadillo Armour go first, even with RO water?</h3><p>Armadillo Armour is monosilicic acid (MSA). MSA polymerizes and becomes unavailable to plants when it hits concentrated mineral salt solutions. Adding it to plain water first, before any other nutrients, keeps it in the form plants can actually use. This is true regardless of whether you&apos;re on tap, filtered, or RO water.</p><h3 id="why-does-monkey-juice-go-last-after-ph-adjustment">Why does Monkey Juice go last, after pH adjustment?</h3><p>Monkey Juice is a beneficial bacteria inoculant. The acids we use to adjust pH (pH down is usually phosphoric or citric acid) can kill the live bacteria on contact. Adding Monkey Juice after you&apos;ve already adjusted pH keeps the bacteria alive.</p><h3 id="can-i-mix-bonnie-and-clyde-together">Can I mix Bonnie and Clyde together?</h3><p>No. Bonnie is for the vegetative stage and Clyde is for flower. You switch from one to the other when the plant transitions, around week 4 to 5 for most autoflowers. They&apos;re never used in the same feeding.</p><h3 id="why-is-coco-capped-at-ph-65-but-soil-goes-up-to-70">Why is coco capped at pH 6.5 but soil goes up to 7.0?</h3><p>Coco has a higher cation exchange capacity than soil, which means it actively competes with your plant for calcium and magnesium. Above pH 6.5, coco locks out iron and phosphorus quickly. Soil buffers better and tolerates a wider pH range without lockout.</p><h3 id="how-long-should-i-wait-between-adding-each-nutrient">How long should I wait between adding each nutrient?</h3><p>30 seconds of stirring is enough for most products. Armadillo Armour gets a full 5-minute wait because MSA needs time to disperse properly. CalMag gets 2 minutes if you want to be careful on RO water. Everything else is just stir-and-continue.</p><h3 id="can-i-mix-all-my-nutrients-in-one-bottle-and-pour-it-in">Can I mix all my nutrients in one bottle and pour it in?</h3><p>No. Each nutrient needs to fully dissolve in water before the next one is added. Pre-mixing everything into one concentrated bottle causes precipitation, lockout, and dead beneficial bacteria. Add to the reservoir one product at a time.</p><h3 id="how-long-can-i-store-mixed-nutrient-solution">How long can I store mixed nutrient solution?</h3><p>Up to 10 days in a sealed, cool, dark container, stirred before each use. Solutions with Monkey Juice are best used the same day because the bacterial populations shift over time.</p><h2 id="need-help-choosing-the-right-chart">Need help choosing the right chart?</h2><p>Email our grow support team at <a href="mailto:help@cronknutrients.com">help@cronknutrients.com</a>. Include your setup (medium, lighting, plant stage, genetics if relevant) and we&apos;ll tell you exactly which chart to run. We respond within 24 hours.</p><script type="application/ld+json">
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Feeding Charts for Cronk Nutrients Lines

Have a question about feeding schedules, product use, or an order? Our grower support team is here to help.

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Cronk Nutrients Growers Knowledge Hub

Find plant feeding charts and schedules for every grow. Learn how to time nutrients, adjust ratios, and keep your plants healthy through each growth stage.

Feeding & Schedules: Plant Nutrient Timing – Cronk Nutrients

Grower Resources

Feeding & Schedules

Choosing the Right Cronk Nutrients for Your Grow

Understanding NPK: What Those Numbers on Your Fertilizer Really Mean

Liquid Nutrients vs. Dry Nutrients: Which Is Best for Your Grow?

What Does CalMag Do for Plants?

Nutrient Basics

Choosing the Right Grow Medium: Soil, Coco, or Hydroponics?

What Size Pots Should I Use for My Plants?

Grow Setup

Top 10 Beginner Grow Mistakes (and How to Avoid Them)

First Grow Tips

Getting Started

pH & Water Quality: Why Balance Matters

pH & Water Quality

Understanding EC & Nutrient Strength: A Grower’s Guide

EC & PPM in Organic vs Salt-Based Nutrition: What Every Grower Must Know

EC/PPM & Nutrient Strength

Understanding Grow Lights for Cannabis: A Beginner’s Guide

Growing Indoors vs. Outdoors: Which Is Best for Your Grow?

Light & Environment

The Science of Growing Vibrant Basil: Choosing the Right Medium, Nutrients & Microbes

The Best Pot Size and Growing Medium for Autoflowers: A Complete Grower’s Guide

Choosing the Right Grow Medium for Cannabis: Soil, Coco, or Hydro?

How to Feed Cannabis in Coco Coir: A Complete Guide

Grow Mediums & Systems

Photosynthesis & Carbohydrates: Powering Plant Growth and Fruit Quality

How Magnesium Powers Photosynthesis and Plant Growth

Unlock Your Plants’ Potential: Understanding Nitrogen, Phosphorus, and Potassium

The Science of Growing Beefsteak Tomatoes: From Seed to Harvest

The Science of Flowering Nutrition: Choosing the Best Fertilizer for Bloom Growth

How to Choose Between Organic and Mineral Nutrients

Understanding EC, pH, and Nutrient Uptake

Silica for Plants: What It Is, Why It Matters, and How to Use It for Stronger Growth

THC vs Terpenes: Why the Smell Is the Story (And How to Grow More of It)

The Science Behind Beneficial Bacteria and Why Your Root Zone Needs Them

Plant Science & Nutrition

Grow Science

How to Grow Autoflowers with Cronk's Classic 3-Part (Micro + Grow + Bloom)

Grow Guides

Cronk Nutrients – Classic Line Basic Feed Chart Guide

Mixing & Usage

Cronk Nutrients 3-Part Base Mixing Guide: Master Feeding for Maximum Growth

Cronk Classic 3-Part Kit: Complete Guide to Professional Plant Nutrition

Cronk Big Bud Kit: Complete 5-Part System for Maximum Results

Cronk Micro 5-0-1: Complete Guide to the Foundation of Plant Nutrition

Cronk Grow 2-1-6: Complete Guide to Vegetative Nutrition

Cronk Bloom 0-5-3: Complete Guide to Flowering Nutrition

Product Guides

Classic Line

Cronk Nutrients – Autoflower Line Basic Feed Chart Guide

Cronk Nutrients – Autoflower Line Intermediate Feed Chart Guide

Cronk Nutrients – Autoflower Line Expert Feed Chart Guide

Bonnie & Clyde Mixing Guide: Autoflower Nutrients 101

Bonnie & Clyde: The Complete Autoflower Nutrient Guide | Cronk Nutrients

Cronk Bonnie 6-5-4: Complete Guide to Autoflower Vegetative Nutrition

Cronk Clyde 3-6-5: Complete Guide to Autoflower Flowering Nutrition

Cronk Bonnie & Clyde Kit: Complete Guide to Autoflower Nutrition

Cronk Prema Kit: Complete Autoflower Nutrition System

Bonnie & Clyde (Autoflower Line)

Introducing PuurOrganics: A Cleaner Path to Organic Liquid Fertilizer Success

What Is PuurOrganics?

Why Use PuurOrganics?

Cronk PuurOrganics Kit: Complete Guide to OMRI Organic Nutrition

Cronk PuurNitro 8-0-0: Complete Guide to Organic Nitrogen Nutrition

Cronk PuurPhos 0-12-0: Complete Guide to Organic Phosphorus Nutrition

Cronk PuurK 0-0-15: Complete Guide to Organic Potassium Nutrition

Cronk PuurBalance 2-0-0: Complete Guide to Organic Amino Acids and Micronutrients

Cronk PuurCalMag: Complete Guide to Organic Calcium and Magnesium Supplementation

Cronk Nutrients – PuurOrganics Feed Chart Guidance

PuurOrganics

What Is CalMag and How Do You Use It for Cannabis

Cronk CalMag 2-0-0: Complete Guide to Calcium & Magnesium Supplementation

CalMag 2-0-0

How to Use a Bloom Booster to Increase Bud Size and Yield

Cronk Bud Booster 0-1-3: Complete Guide to PK Bloom Enhancement

Bud Booster 0-1-3 (Flower Enhancer)

Cronk Monkey Juice: Complete Guide to Beneficial Bacteria Inoculation

Monkey Juice (Beneficial Bacteria)

Sticky Bandit Mixing Guide: Boost Terpenes, Flavor & Potency

Cronk Sticky Bandit 0-0-1: Complete Guide to Carbohydrate Supplementation

Sticky Bandit 0-0-1 (Resin Enhancer)

Cronk Armadillo Armour: Complete Guide to Monosilicic Acid Supplementation

Armadillo Armour (Mono Silica)

Additives & Boosters

Cronk Nutrient Lines

Best Nutrients for Autoflowers in 2026: A Grower's Comparison

The Best Autoflower Nutrients: Highigan’s Massive Grow with Cronk Nutrients Bonnie & Clyde

Best Organic Fertilizer for Cannabis 2025: HomeGrowTV Tests Cronk Nutrients PuurOrganics

How HomeGrowTV’s Greenhouse Thrived with Cronk Nutrients PuurOrganics

HomeGrowTV’s Late-Flower Play: Sticky Bandit for Terpenes, Resin & Aroma

5 Growing Mistakes & Fixes from HomeGrow TV | Cronk Nutrients

Harvesting for Fresh Frozen: Highigan's Emoji Chop Day with Cronk Nutrients & AutoPots

Running Autopots with Premium Genetics: A Complete Guide

We Harvested Everything: Home Grow TV's 250-Plant Bamboo Greenhouse Harvest

HomeGrowTV's CO2 Harvest: MAC 10, Bloogatti, Mr. Stinky F2 & Kaleidozoap Reviewed | Cronk Nutrients

Grower Community

Cronk Nutrients SDS Sheets

SDS & Docs

Grower Glossary – A

Grower Glossary – B

Grower Glossary – C

Grower Glossary – D

Grower Glossary – E

Grower Glossary – F

Grower Glossary – G

Grower Glossary – H

Grower Glossary – I

Grower Glossary – J

Grower Glossary – K

Grower Glossary – L

Grower Glossary – M

Grower Glossary – N

Grower Glossary – O

Grower Glossary – P

Grower Glossary – Q

Grower Glossary – R

Grower Glossary – S

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Grower Glossary – V

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Grower Terminology

What order should I mix Cronk Nutrients in?

When should I start feeding my plants Cronk Nutrients?

Can I mix all Cronk Nutrients together?

How often should I feed my plants Cronk Nutrients?

Do I need to use CalMag with Cronk Nutrients?

Which Cronk Nutrient system should I use for my grow?

Can I use Cronk Nutrients with other brands?

Can I use Cronk Nutrients in DWC or hydroponics?

Can I use Sticky Bandit and CalMag with PuurOrganics?

Is there anything else I should buy to help my plants thrive?

How can I prevent nutrient lockout when feeding my plants?

Can I use Cronk Nutrients in a drip irrigation or auto-watering system?

Can I foliar feed with Cronk Nutrients?

How do I transition from vegetative to flowering nutrients?

Should I use plain water between feedings?

Why are pH and EC important in plant growth?

Feeding & Mixing FAQ

Why are my plant leaves turning yellow?

Why are my leaves curling up or down?

My plants have brown spots on the leaves—what’s happening?

Why is my plant’s growth uneven or stunted?

Why are my buds small and airy?

My plants look pale even though I’m feeding—what’s wrong?

Why are my plants drooping after watering?

My pH keeps fluctuating — how do I fix it?

Why are my stems purple or red?

Troubleshooting & Deficiencies

How should I store Cronk Nutrients?

Can I store Cronk Nutrients in my garage or shed?

Can Cronk Nutrients go bad if not used for months?

What is the shelf life of Cronk Nutrients?

How long can I store pre-mixed Cronk Nutrient solution?

Storage & Product Safety

Is there a feed chart for Cronk Nutrients?

How do I know which Cronk Nutrients feeding chart to use?

How do I measure nutrients accurately for my grow?

What EC and PPM levels should I target with Cronk Nutrients?

How can I adjust Cronk Nutrients feed charts for smaller or larger plants?

How do I use Cronk Nutrients in coco coir vs. soil?

Do I need to flush when using Cronk Nutrients?

Can I use Cronk Nutrients with compost teas or organic boosters?

How do I convert Cronk Nutrient dosages from liters to gallons?

What do the numbers mean on the Cronk Nutrients feed charts?

Feeding Charts & Measurements

What products does Cronk Nutrients offer?

Can I use Cronk Nutrients on non-autoflowering plants?

Can I use Cronk Nutrients on any type of plant?

What do the numbers on the bottles mean?

General Product FAQ

What should I do if my package is delayed or tracking hasn’t updated?

Can I get a discount code for Cronk Nutrients?

How can I apply for a Cronk Nutrients sponsorship?

My Cronk Nutrients arrived frozen — what should I do?

How long does it take for my Cronk Nutrients order to ship?

My tracking number says “Label Created” but hasn’t updated — what does that mean?