Professor’s Nutrients Organic Feed Chart Explained: Grow Bigger, Tastier Buds in 2025
Skip the bottle maths and say goodbye to nutrient-burn guesswork. Below is your single-page, certified-organic program that carries your crop from seedling to sticky, terpene-rich harvest—no complicated two-part mixes needed.
Why Growers Trust Professor’s Nutrients
Certified-Organic Advantage
Every product in the line is OFC-approved, meaning it meets Australia’s strictest organic-input standards while remaining fully hydro-compatible.
Single-Part Convenience
Just one bottle for veg (Organic Grow) and one for bloom (Organic Bloom) keeps mixing simple and eliminates lock-out headaches common with multi-part mineral feeds.
Australian-Made Performance
Formulated for hot-climate, high-light conditions, the range is trusted from hobby tents to commercial rooms across the country.
Product Line-Up at a Glance
Memorise these five bottles (plus pH control) and you’re set for the whole run.
| Category | Product | Core Function | When to Use | Quick Call-outs |
|---|---|---|---|---|
| Base Nutrients | Organic Grow | Builds foliage & root mass with 72+ macro/micro nutrients | Veg weeks 1 – 5 | 2 – 4 ml /L |
| Organic Bloom | Drives flower formation & bud density | Flower weeks 1 – 9 | 2 – 4 ml /L | |
| Growth Accelerator | Organic Grow Fast | Extra N for rapid canopy expansion | Veg weeks 2 – 5 | Up to 4 ml /L |
| PK Kick-Starter | Flower Boost | Early-bloom PK surge for more sites & weight | Flower weeks 1 – 8 | 2 – 4 ml /L |
| Quality Enhancer | Terpene Gold | Amplifies oils, resin & aroma | Flower weeks 1 – 8 | 2 – 4 ml / 10 L |
| Solution Support | Organic pH Up / Down | Maintains 5.5 – 6.5 sweet-spot | Anytime | Essential for organic inputs |
The Complete 9-Week Organic Feeding Schedule
Follow the chart exactly and watch your plants explode. “Water” means plain, pH-balanced water for a clean finish.
| Stage | Week |
Grow (ml/L) |
Grow Fast (ml/L) |
Bloom (ml/L) |
Flower Boost (ml/L) |
Terpene Gold (ml/10 L) |
Notes |
|---|---|---|---|---|---|---|---|
| Veg | 1 | 2 | – | – | – | - | Keep EC ≤ 1.2 |
| 2 | 2 | 2 | – | – | - | Tight internodes | |
| 3 | 4 | 4 | – | – | - | Rapid canopy fill | |
| 4 | 4 | 4 | – | – | - | Prep for switch | |
| 5 | 4 | 4 | – | – | - | Final veg push | |
| Flower | 1 | – | – | 2 | 2 | 2 | Flip Day 1 |
| 2 | – | – | 2 | 3 | 2 | Bud sites multiplying | |
| 3 | – | – | 2 | 3 | 4 | Raise EC to 1.6 | |
| 4 | – | – | 2 | 4 | 4 | Mid-bloom bulking | |
| 5 | – | – | 2 | 4 | 4 | Watch Ca/Mg | |
| 6 | – | – | 2 | 4 | 4 | Aroma intensifying | |
| 7 | – | – | 2 | 4 | 4 | Peak oil production | |
| 8 | – | – | 2 | 2 | 4 | Begin fade | |
| 9 | Water | Water | Water | Water | Water | 5-7 day flush |
Pro Tips for Dialling-In Your Grow
- Empty & refill the reservoir weekly to prevent salt build-up.
- Keep pH 5.5 – 6.5 for maximum nutrient uptake.
- Maintain solution 20 – 24 °C for peak dissolved oxygen and root health.
How the Products Work Together
Base + Accelerator (Veg)
Organic Grow supplies the full NPK spectrum, while Grow Fast layers in rapid-uptake nitrogen, pushing cell division so you hit canopy size sooner.
Base + PK + Terpene (Flower)
Organic Bloom keeps nutrition balanced; Flower Boost front-loads phosphorus and potassium for site stacking; finally, Terpene Gold super-charges secondary-metabolite pathways for louder aromas and richer resin.
Organic pH Control
Organic inputs drift acidic—Professor’s pH Up/Down let you pin the ideal range quickly without harming beneficial microbes.
Environmental Guard-Rails
- pH: 5.5 – 6.5
- EC (Veg): 1.0 – 1.4 mS/cm
- EC (Bloom): 1.5 – 2.0 mS/cm
- Solution Temp: 20 – 24 °C
Frequently Asked Questions (FAQ)
Can I run this schedule in coco?
Absolutely. Coco’s natural cation exchange capacity means you can bump EC by about 0.2 and keep runoff pH toward the low end (5.5 – 5.8) for best results.
Do I need extra Cal-Mag?
Not in soft-to-medium water (< 0.3 EC). If your tap water is harder, supplement with a chelated Cal-Mag at 0.5 – 1 ml/L.
Is the week-9 flush mandatory?
For slow-release organics, 5-7 days of plain, pH-balanced water is plenty—flush until runoff EC matches inflow.
Can I combine these bottles with synthetic boosters?
Stick to the organic line for best micro-life synergy; mixing mineral salts can disrupt nutrient availability.
Next Steps
- Bundle & Save – grab the full Organic Grower Kit, including pH buffers.
- Download or screenshot the feed chart above for quick tent-side reference.
- Log pH, EC, and temp daily—great harvests are repeatable when you track the data.
