Classic 3-Part Kit: Professional Nutrition with Complete NPK Control

The Classic 3-Part Kit provides complete plant nutrition through three complementary formulas: Micro (5-0-1) delivers essential calcium, iron, and micronutrients; Grow (2-1-6) supports vegetative development; and Bloom (0-5-3) drives flowering. This professional system gives growers precise control over nutrient ratios at every growth stage.

Kit Contents

Why 3-Part Systems Work Better

The Problem with Fixed-Ratio Fertilizers

Single-bottle "grow" or "bloom" formulas deliver the same nutrient ratios regardless of plant needs:

• Seedlings get the same formula as mature flowering plants
• Vegetative plants receive unnecessary phosphorus
• Flowering plants may receive excess nitrogen
• No ability to respond to plant-specific needs

The 3-Part Advantage

With independent Micro, Grow, and Bloom bottles, you can:

• Match nutrients to growth stage – High Grow during veg, high Bloom during flower
• Adjust for plant genetics – Heavy feeders vs. light feeders
• Respond to deficiencies – Increase specific components as needed
• Fine-tune for your environment – Lighting, temperature, growing medium

Mixing Ratios by Growth Stage

General Guidelines (mL per gallon)

Adjustments by Growing System

• Soil: Use rates as shown above
• Coco coir: Similar rates, but feed more frequently (daily)
• Hydroponics: Reduce rates by 30-50%; constant nutrient availability means lower concentrations work

Mixing Instructions

Critical: Mixing Order

Always add Micro FIRST, before Grow and Bloom. Here's why:

• Micro contains calcium, which reacts with concentrated phosphorus
• Adding Micro to plain water allows calcium to disperse and stabilize
• Adding Bloom before Micro can cause calcium phosphate precipitation
• Precipitation removes nutrients from solution and clogs equipment

Complete Mixing Order

1. Water – Fill container to target volume
2. Armadillo Armour – If using silicon (add before all other nutrients)
3. CalMag – If using (for coco, RO water, or LED grows)
4. MICRO – Always first among the three base nutrients
5. Grow – Second
6. Bloom – Third
7. Additives – Bud Booster, Sticky Bandit, Monkey Juice, etc.
8. pH adjustment – After everything is mixed

Target pH and EC

pH Targets

EC/PPM Targets

When to Add CalMag

CalMag Is Recommended For:

• Coco coir – Coco binds calcium and magnesium from solution
• RO or soft water – Lacks natural mineral content
• LED grows – High-efficiency lighting increases Cal-Mag demand
• Heavy-feeding genetics – Some strains need more than others

You May Not Need CalMag If:

• Growing in soil with hard tap water (already contains minerals)
• Using HPS/MH lighting (lower Cal-Mag demand than LED)
• Growing light-feeding genetics
• Seeing no deficiency symptoms

Recommended Upgrades

Essential Additions

• CalMag – For coco, RO water, or LED grows
• Bud Booster – Extra PK during flowering for increased yields

Advanced Additions

• Armadillo Armour – Silicon for plant strength and pest resistance
• Sticky Bandit – Carbohydrates for terpene enhancement
• Monkey Juice – Beneficial bacteria for root health

Upgrade option: The Big Bud Kit includes the Classic 3-Part plus CalMag and Bud Booster—everything you need for complete nutrition.

Compatibility

Compatible Growing Systems

• Soil (potting mix, living soil, super soil)
• Coco coir (loose coco, coco perlite blends)
• Hydroponics (DWC, RDWC, NFT, drip systems)
• Aeroponics

Compatible Cronk Additives

• CalMag 2-0-0
• Bud Booster 0-1-3
• Sticky Bandit 0-0-1
• Monkey Juice
• Armadillo Armour

NOT Compatible With

• PuurOrganics products – Different nutrient system
• Other brand base nutrients (mixing bases not recommended)

Frequently Asked Questions

Why choose a 3-part system over single-bottle nutrients?

Single-bottle nutrients deliver fixed ratios regardless of growth stage—seedlings get the same formula as flowering plants. The 3-Part system lets you adjust NPK ratios for each stage: more nitrogen during veg (higher Grow), more phosphorus during bloom (higher Bloom). This precision matching of nutrients to plant needs produces better results than any fixed formula.

Why must Micro always be added first?

Micro contains calcium, which can react with phosphorus and sulfur in Grow and Bloom, forming insoluble precipitates. Adding Micro to water first, before concentrated phosphorus sources, allows calcium to disperse and stabilize. This prevents precipitation that would remove nutrients from solution and clog irrigation systems.

Do I need CalMag with the Classic 3-Part system?

It depends on your situation. CalMag is recommended for: coco coir (which binds calcium and magnesium), RO or soft water (which lacks natural minerals), and LED grows (which increase Cal-Mag demand). If you're growing in soil with tap water under HPS lights, you may not need supplementation—but monitor for deficiency symptoms.

Can I use the Classic 3-Part system for autoflowers?

Yes, but the Bonnie & Clyde system is specifically designed for autoflowers and may be simpler. If using Classic 3-Part for autos, start with very light feeding (50% strength) since autoflowers are smaller and more sensitive. Transition from high-Grow to high-Bloom ratios quickly since autos have compressed lifecycles.

Need Help?

Our grow support team is here to help you get the best results with the Classic 3-Part system. Contact us at [email protected] or visit our Grower's Resource Center for detailed feed charts.