Cronk Classic 3-Part Kit | Micro + Grow + Bloom Fertilizer Set
500mL
Sale price
$28.16
Regular price
$29.64
Skip to product information
In stock
Cronk Classic 3-Part Kit | Micro + Grow + Bloom Fertilizer Set
Sale price
$28.16
Regular price
$29.64
Complete System
Product Overview
The Classic 3-Part Kit provides complete plant nutrition through three complementary formulas: Micro (5-0-1) establishes the micronutrient foundation, Grow (2-1-6) drives vegetative development, and Bloom (0-5-3) supports flowering. This professional system gives growers precise control over nutrient ratios at every growth stage—something single-bottle fertilizers cannot offer.
Pre-mixed all-in-one fertilizers deliver fixed ratios regardless of growth stage. Seedlings get too much phosphorus. Flowering plants get excess nitrogen. The Classic 3-Part system eliminates these compromises through adjustable mixing ratios that match actual plant requirements throughout the entire lifecycle.
Kit Contents
- Micro 5-0-1 – Calcium, iron, and chelated trace minerals (add first)
- Grow 2-1-6 – Balanced vegetative nutrition with elevated potassium
- Bloom 0-5-3 – Nitrogen-free flowering formula with elevated PK
Key Benefits
- Adjust NPK ratios for each growth stage instead of accepting fixed formulas
- Fully soluble for soil, coco coir, and hydroponic systems
- Professional-grade nutrition used by commercial cultivators
- Same three bottles work from seedling through harvest
Recommended Additions
Add CalMag for coco coir, RO water, or LED grows. Add Bud Booster during flowering for enhanced bloom performance. Upgrade to the Big Bud Kit for the complete package.
What's Inside
What's Included in This Kit
- Cronk Micro 5-0-1 | Base Fertilizer with Calcium & Iron
- Cronk Grow 2-1-6 | Vegetative Stage Plant Fertilizer
- Cronk Bloom 0-5-3 | Flowering Stage Plant Fertilizer
How To Use
3-Part Kit
Micro, Grow, and Bloom work together as your complete base nutrient system, providing all essential macro and micronutrients from seed to harvest. Micro establishes the foundation with chelated micronutrients and calcium. Grow supports vigorous vegetative growth with nitrogen and potassium. Bloom delivers phosphorus and potassium for explosive flowering. Detailed week-by-week feeding instructions are available in the Feed Schedules section.
- Mix in room temperature water (65-72°F / 18-22°C)
- If using Armadillo Armour, add it FIRST before all other nutrients
- Mixing Order: Armadillo (if using) → Micro (FIRST) → Grow → Bloom → Other Additives → Monkey Juice (LAST)
- Frequency: Use Micro, Grow, and Bloom with every feeding throughout the grow cycle
- Always add Micro first to prevent nutrient precipitation and lockout
- These three products provide complete nutrition from seed to harvest
- CalMag can be added if needed (optional, not required)
- For specific dosages and week-by-week schedule, see Feed Schedules section
⚠️ Mixing Order: Armadillo (if using) → Micro (FIRST) → Grow → Bloom → Additives → Monkey Juice (LAST)
Basic Mixing Instructions
- Start with room temperature water (65-72°F / 18-22°C)
- If using Armadillo Armour, add it FIRST before all other nutrients
- Add nutrients in proper mixing order (see Compatibility section)
- Mix each nutrient thoroughly before adding the next
- Check and adjust pH (5.6-6.4 depending on stage)
- Apply to plants - water until 10-20% runoff
Customer Reviews
Feed Schedules & Dosage
3-Part Kit - Complete Feed Schedule
Week-by-week dosages for Micro, Grow, and Bloom. This is the foundation of the Classic Line system.
Vegetative Stage
| Week | Stage | Micro | Grow | Bloom |
|---|---|---|---|---|
| 1 | Seedling | 1.25 | 1.25 | 1.25 |
| 2 | Early Veg | 2.5 | 2.5 | 2.5 |
| 3 | Mid Veg | 2.5 | 2.5 | 2.5 |
| 4 | Late Veg | 2.5 | 2.5 | 5.0 |
Flowering Stage
| Week | Stage | Micro | Grow | Bloom |
|---|---|---|---|---|
| 1 | Pre-Flower | 5.0 | 5.0 | 5.0 |
| 2 | Early Flower | 5.0 | 5.0 | 7.5 |
| 3 | Early Flower | 5.0 | 2.5 | 7.5 |
| 4 | Mid Flower | 5.0 | 2.5 | 7.5 |
| 5 | Mid Flower | 5.0 | 2.5 | 7.5 |
| 6 | Late Flower | 2.5 | 1.25 | 7.5 |
| 7 | Late Flower | 4.0 | 0.0 | 7.5 |
| 8 | Ripen | 1.25 | 0.0 | 7.5 |
| 9 | Flush | 0.0 | 0.0 | 0.0 |
All dosages in mL/gallon. Mixing order: Always add Micro first, then Grow, then Bloom.
Compatibility
Compatible Plant Types
Hemp
Vegetables
Fruits
Flowers
Houseplants
High-Value Crops
Compatible Growing Mediums
Soil
Coco Coir
Hydroponics
Soilless Mixes
Compatible Irrigation Styles
Hand Watering
Drip Systems
AutoPot Systems
Bottom Feed
Recirculating Systems
Fertigation
General Mixing Tips
- Use room temperature water (65-72°F / 18-22°C)
- Mix each nutrient thoroughly before adding the next
- Never mix concentrated nutrients together
- Check and adjust pH after all nutrients are mixed
- Store nutrients in cool, dark place away from direct sunlight
Frequently Asked Questions
What’s the difference between Grow, Micro, and Bloom?
Each part plays a role: Micro provides essential micronutrients, Grow supports lush vegetative growth, and Bloom boosts flowering and bud development. Together, they deliver full-cycle nutrition.
How do I mix the 3-Part nutrients correctly?
Always add Micro first, then Grow, then Bloom. Mix thoroughly between each. This order prevents nutrient lockout and keeps your mix balanced and stable.
Can I use the Classic Line in soil and hydroponics?
Yes — the Classic Line works great in soil, coco, or hydro systems. Just adjust your feed strength: lighter for soil, stronger for hydro.
Can I use other Cronk additives?
Absolutely. Additives like CalMag, Sticky Bandit, Bud Booster, Monkey Juice, and Armadillo Armour all work perfectly with The Classic Line.
What’s the ideal pH range when using the 3-Part system?
Keep your pH between 5.8–6.3 for hydro/coco and 6.2–6.8 for soil. Staying in range helps your plants fully absorb nutrients.
Do I need to flush when using Cronk Nutrients?
Yes — flushing for 5–7 days before harvest helps remove excess salts and improves flavor and burn quality. Use plain, pH-balanced water.
Complete Your System
Add these essential products for optimal results throughout your grow.
2-0-0
CalMag 2-0-0: Cal-Mag + Iron
Essential calcium, magnesium, and iron for coco coir, RO water, and LED grows.
- Calcium and magnesium supplement
- Prevents common deficiencies
- Essential for coco coir grows
From $12.88
0-1-3
Bud Booster 0-1-3: PK Boost
Extra P and K for bigger, denser buds during peak flowering.
- PK booster for flowering
- Increases bud density and weight
- Zero nitrogen formula
From $20.88
Complete Kit
Save 5%
Save with the Complete Kit
Get everything you need in one package and save up to 15%.
Big Bud Kit - Complete System
Complete 5-part nutrient kit with Micro, Grow, Bloom, CalMag, and Bud Booster. Everything needed for bigger buds and maximum yields.
- Complete 5-Part System
- Seed to Harvest
- Professional Grade
$62.40
$59.28
Legal Disclaimer
Important Information for Our Customers
At Cronk Nutrients, we are committed to providing high-quality liquid plant fertilizers suitable for a variety of horticultural applications. Our products are designed for legal and responsible use by home growers and gardening enthusiasts. We do not condone or promote the use of our products for illegal purposes.
Customers are responsible for adhering to their local and state laws regarding plant cultivation. It is the sole responsibility of the customer to ensure compliance with all applicable laws and regulations. Cronk Nutrients will not be liable for any misuse of our products in violation of any laws.
By purchasing our products, the customer acknowledges their obligation to comply with the legal standards set forth in their jurisdiction and agrees to use our products in accordance with these laws. Cronk Nutrients reserves the right to refuse service to anyone suspected of using our products for illegal cultivation.
Thank you for choosing Cronk Nutrients for your plant nutrition needs. Grow with confidence, grow legally.