Classic Line
Our flagship 3-part base nutrient system. Complete nutrition from seed to harvest for all growing systems.
- Complete nutrition from seed to harvest
- Works in soil, coco, and hydroponics
- pH stabilized for optimal uptake
- Professional-grade formula
The Complete System
Each component works together to deliver complete nutrition from seed to harvest
Micro
NPK: 5-0-1
The essential foundation of nitrogen, calcium, and trace minerals that every plant needs to thrive. Micro sets the stage for healthy growth at every stage.
- Essential nitrogen and calcium base
- Complete trace mineral profile
- Works with any growing medium
- Professional-grade concentrated formula
Available Sizes:
500mL
1L
4L
10L
20L
208L
1000L
Grow
NPK: 2-1-6
Drives lush vegetative growth with specialized nutrients that build strong stems and healthy foliage.
- Promotes vigorous vegetative growth
- Builds strong stems and branches
- Rich in growth-phase nutrients
- Perfect for the veg stage
Available Sizes:
500mL
1L
4L
10L
20L
208L
1000L
Bloom
NPK: 0-5-3
Fuels big, aromatic flowers and dense fruit with targeted bloom-phase nutrition.
- Maximizes flower production
- Enhances aroma and flavor
- Supports dense, quality yields
- Optimized for flowering stage
Available Sizes:
500mL
1L
4L
10L
20L
208L
1000L
Application Guide
Complete 3-part feeding schedule from seedling to harvest
Classic Line 3-Part Feed Schedule
Complete 3-Part Base System
The Classic Line is a professional 3-part nutrient system that provides complete nutrition throughout all growth stages:
- Micro (5-0-1) - Foundation with essential micronutrients and nitrogen
- Grow (2-1-6) - Vegetative growth support with elevated potassium
- Bloom (0-5-3) - Flowering formula with high phosphorus for bud development
⚠️ Strongly Recommended to Add:
- CalMag (2-0-0) - Prevents common calcium and magnesium deficiencies, especially important in coco coir and RO water systems.
Critical Mixing Order: Always mix Micro first, then Grow, then Bloom. This prevents nutrient lockout and ensures proper absorption.
Vegetative Stage (Weeks 1-4)
Week / Stage
Micro
(mL/gal)
Grow
(mL/gal)
Bloom
(mL/gal)
Week 1 - Seedling
Micro: 1.25 mL/gal
Grow: 1.25 mL/gal
Bloom: 1.25 mL/gal
Week 2 - Early Veg
Micro: 2.5 mL/gal
Grow: 2.5 mL/gal
Bloom: 2.5 mL/gal
Week 3 - Mid Veg
Micro: 2.5 mL/gal
Grow: 2.5 mL/gal
Bloom: 2.5 mL/gal
Week 4 - Late Veg
Micro: 2.5 mL/gal
Grow: 2.5 mL/gal
Bloom: 2.5 mL/gal
Flowering Stage (Weeks 1-9) - Adjust Ratios
Week / Stage
Micro
(mL/gal)
Grow
(mL/gal)
Bloom
(mL/gal)
Week 1 - Pre-Flower
Micro: 5.0 mL/gal
Grow: 5.0 mL/gal
Bloom: 5.0 mL/gal
Week 2 - Early Flower
Micro: 5.0 mL/gal
Grow: 5.0 mL/gal
Bloom: 5.0 mL/gal
Week 3 - Early Flower
Micro: 5.0 mL/gal
Grow: 5.0 mL/gal
Bloom: 7.5 mL/gal
Week 4 - Mid Flower
Micro: 5.0 mL/gal
Grow: 2.5 mL/gal
Bloom: 7.5 mL/gal
Week 5 - Mid Flower
Micro: 5.0 mL/gal
Grow: 2.5 mL/gal
Bloom: 7.5 mL/gal
Week 6 - Late Flower
Micro: 2.5 mL/gal
Grow: 2.5 mL/gal
Bloom: 7.5 mL/gal
Week 7 - Late Flower
Micro: 4.0 mL/gal
Grow: 2.5 mL/gal
Bloom: 7.5 mL/gal
Week 8 - Ripen
Micro: 1.25 mL/gal
Grow: 1.25 mL/gal
Bloom: 7.5 mL/gal
Week 9 - Flush
Micro: - mL/gal
Grow: - mL/gal
Bloom: - mL/gal
Key Points: All three nutrients (Micro, Grow, Bloom) are used together throughout the entire grow. Mix Micro first to prevent nutrient lockout. Ratios change during flowering to boost bloom development. pH target: 5.6-6.4 depending on stage. All measurements in mL per gallon (1 gallon = 3.79L).
Mixing Instructions
1
Start with Clean Water
Use room temperature water (18-22°C / 65-72°F) in a clean container. Start with at least 1 gallon (3.79L) of water.
2
Add Micro First
Critical: Always add Micro first and stir thoroughly for 30 seconds. This prevents nutrient lockout and ensures proper chelation of micronutrients.
3
Add Grow Second
After Micro is fully mixed, add Grow and stir thoroughly for 30 seconds.
4
Add Bloom Third
After Grow is mixed, add Bloom and stir thoroughly. Wait 1-2 minutes before adding any supplements.
5
Check pH & EC
Target pH: 5.6-5.9 (seedling), 5.9-6.2 (veg), 6.0-6.4 (flower). Target EC: Gradually increase from 0.5 (seedling) to 1.8-2.2 (peak flower).
6
Apply to Plants
Water until 10-20% runoff in drain-to-waste systems. Feed frequency depends on your medium: daily in hydro/coco, 2-3 times per week in soil.
Classic Line Pro Tips
- Micro first, always: Mixing Micro first prevents nutrient lockout. Never skip this step.
- Adjust ratios during flower: Notice how Grow reduces and Bloom increases starting week 3 of flower - this drives bud development
- Add CalMag for best results: Coco coir naturally holds calcium and magnesium, making CalMag essential for coco growers. Also critical when using RO water.
- Gradual increases: Start low in seedling stage and gradually increase. Plants can't use what they can't absorb.
- Monitor EC: Track your electrical conductivity - if you see tip burn, reduce strength by 20%
- Final flush: Week 9 flush with plain pH'd water improves final product taste and quality
- Storage: Store bottles in a cool, dark place. Shake well before each use as settling is normal.
Need More Feeding Options?
Download our complete Classic Line feeding charts including intermediate and advanced schedules with optional additives like CalMag, Bud Booster, Monkey Juice, Sticky Bandit, and Armadillo Armour for maximum yields.
Compatible Additives
Enhance your results with our premium additives and supplements
CalMag 2-0-0
Balances calcium and magnesium for stronger, greener plants.
- Prevents common Ca/Mg deficiencies
- Boosts chlorophyll and leaf growth
- Improves nutrient absorption
Bud Booster 0-1-3
Enhances flower size, density, and yield with a clean PK boost.
- Boosts PK for denser, heavier flowers
- Accelerates bud formation and swelling
- Maximizes yield and bloom quality
Sticky Bandit 0-0-1
Feeds plants and microbes with natural carbs for richer aroma.
- Boosts terpene and flavor profile
- Fuels plant growth and energy
- Supports root and microbe health
Educational Videos Coming Soon
We are creating helpful video guides to help you get the most out of your products. Check back soon!
Frequently Asked Questions
Find answers to common questions
Can I use the Classic Line in coco or hydro?
Yes! The Classic Line works perfectly in soil, coco, and hydroponic systems. It's fully soluble and easy to control for any grow style.
Is the Classic Line organic?
No, the 3-Part Classic Line isn't organic — it's made from clean, high-purity minerals for fast, consistent nutrient uptake. For growers seeking a natural option, we recommend our PuurOrganics Line.
What plants can I use this on?
You can use the Classic Line on almost any plant, from cannabis to vegetables, herbs, and ornamentals. It provides complete, balanced nutrition at every stage.
Do I have to mix all three parts together?
Yes it is recommend to use all three together. The system is designed to use Micro, Grow, and Bloom together. Always mix Micro first, then Grow, then Bloom, stirring between each to prevent lockout.
Is the Classic Line compatible with Cronk additives?
Yes, it's fully compatible with all Cronk Nutrients additives, including Sticky Bandit, Bud Booster, Monkey Juice, and Armadillo Armour.
How often should I feed my plants?
Feed every watering in coco or hydro, and 1–2 times per week in soil, alternating with plain water to prevent salt buildup.
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.