Cronk Nutrients – Classic Line Basic Feed Chart GuideUpdated 2 days ago
🌱 Program Overview
The Classic Line Basic Feed Program is Cronk Nutrients’ most accessible schedule — perfect for beginners or light-feeding growers.
It provides complete nutrition through every growth phase using Micro, Grow, Bloom, and CalMag, ensuring balanced vegetative growth and smooth transition into flowering.
This schedule is designed for photoperiod plants in soil, coco, or hydro setups and supports healthy development from seedling to harvest.
Measurement Units: Milliliters (mL) per Gallon
Mixing Instructions
Begin with clean, pH-balanced water.
Add nutrients in this order:
Micro
Grow
Bloom
CalMag (not needed but recommended)
Stir thoroughly after each addition.
Recheck and adjust pH before watering.
Maintain water temperature between 68–72°F (20–22°C).
💡 Tip: Never mix nutrients together in concentrate form — always dilute one at a time in water.
Classic Line Basic Feed Schedule
Vegetative Stage (Weeks 1–4)
| Week | Growth Stage | Micro (mL/gal) | Grow (mL/gal) | Bloom (mL/gal) | CalMag (mL/gal) | pH Range | Notes |
|---|---|---|---|---|---|---|---|
| 1 | Seedling | 1.25 | 1.25 | 1.25 | 5 | 5.6–5.9 | Start light feeding to build roots |
| 2 | Early Veg | 2.5 | 2.5 | 2.5 | 5 | 5.9–6.2 | Encourage strong root and stem growth |
| 3 | Mid Veg | 2.5 | 2.5 | 2.5 | 5 | 5.9–6.2 | Maintain consistent vegetative growth |
| 4 | Late Veg | 2.5 | 2.5 | 2.5 | 5 | 5.9–6.2 | Prepare plants for flower transition |
Flowering Stage (Weeks 1–9)
| Week | Growth Stage | Micro (mL/gal) | Grow (mL/gal) | Bloom (mL/gal) | CalMag (mL/gal) | pH Range | Notes |
|---|---|---|---|---|---|---|---|
| 1 | Pre-Flower | 5 | 5 | 5 | 5 | 6.0–6.4 | Transition from Veg to Flower |
| 2 | Early Flower | 5 | 5 | 5 | 5 | 6.0–6.4 | Initiate early flower sites |
| 3 | Early Flower | 5 | 5 | 7.5 | 5 | 6.0–6.4 | Increase Bloom to support bud set |
| 4 | Mid Flower | 5 | 2.5 | 7.5 | 5 | 6.0–6.4 | Shift nutrient focus to bloom production |
| 5 | Mid Flower | 5 | 2.5 | 7.5 | 5 | 6.0–6.4 | Maintain full bloom feeding |
| 6 | Late Flower | 2.5 | 2.5 | 7.5 | 5 | 6.0–6.4 | Begin tapering nitrogen levels |
| 7 | Late Flower | 4 | 2.5 | 7.5 | 5 | 6.0–6.4 | Maintain bloom density and resin growth |
| 8 | Ripe | 1.25 | 1.25 | 7.5 | 5 | 6.0–6.4 | Reduce feed before final flush |
| 9 | Flush | 0 | 0 | 0 | 0 | 6.0–6.4 | Flush with clean, pH-balanced water |
Mixing Example – 10 Gallons
Multiply the rate per gallon ×10.
Example – Veg Week 3:
Micro: 2.5 × 10 = 25 mL
Grow: 2.5 × 10 = 25 mL
Bloom: 2.5 × 10 = 25 mL
CalMag: 5 × 10 = 50 mL
Example – Flower Week 4:
Micro: 5 × 10 = 50 mL
Grow: 2.5 × 10 = 25 mL
Bloom: 7.5 × 10 = 75 mL
CalMag: 5 × 10 = 50 mL
pH & EC Guidelines
Vegetative Stage: pH 5.8–6.2 | EC 1.0–1.4
Flowering Stage: pH 6.0–6.4 | EC 1.4–1.8
Flush: pH 6.0–6.4 | EC 0.0–0.3
Check runoff weekly to monitor nutrient balance and avoid salt buildup.
Feeding Tips
Suitable for soil, coco, or hydroponic systems.
Feed every watering or alternate with plain water in soil grows.
Maintain consistent pH and temperature to improve nutrient uptake.
Adjust feeding strength ±10–20% based on plant size and leaf response.
Reduce Grow and Micro in late flower to promote ripening.
The Classic Line Basic Feed Chart is a reliable, entry-level feeding program that provides your plants with all essential nutrients for healthy growth and flavorful harvests. Follow the week-by-week chart, maintain stable pH, and your plants will reward you with consistent, vibrant results.