GT Focus Range vs GP3: Which Nutrient Is Better?
You've decided to start feeding your plants properly. You open up the nutrients section and suddenly there are two very different types of products staring back at you.
One is a single bottle labelled for your specific plant. The other is a 3-bottle system that looks like it belongs in a chemistry lab. Both are base nutrients. Both work. But they are built for completely different growers.
Here is how to figure out which one is right for you.
🌿 What Is a Single-Part Base Nutrient?
A single-part nutrient is exactly what it sounds like. One bottle contains everything your plant needs to grow from seedling to harvest. No mixing ratios. No adjusting parts A and B. Just measure, add to water, and feed.
The Growth Technology Focus range is built on this principle. Every bottle in the range uses Single Part Technology (SPT), which means all 12 essential minerals including Calcium are already balanced inside the one formula.
The nutrients are chelated for better uptake, pH buffered to reduce swings, and completely free from chlorides, urea, sodium, and ammonium.
That last point matters more than most people realise. Urea-based nutrients can cause root burn and unpredictable pH shifts, especially in hydroponic systems. The Focus range avoids this entirely.
🧪 Why the Focus Range Is Plant-Specific
Here is where it gets interesting. The Growth Technology Focus range is not a generic one-size-fits-all formula. Each bottle is tuned to the specific nutritional demands of a particular plant type.
A fruiting tomato plant has a dramatically higher Potassium demand than a leafy herb. A succulent needs elevated Calcium and Phosphorus to maintain firm, healthy tissue. A tropical foliage plant runs photosynthesis hard and needs more Magnesium to support that chlorophyll production.
The Focus range accounts for all of this. Here is how the key formulas differ:
- 🌿 Herb Focus: Balanced formula with a simple weak, normal, and strong feeding schedule. Great for basil, coriander, mint, and most culinary herbs.
- 🍅 Fruit Focus: Elevated Potassium at 3.3% to drive sugar transport and fruit development. Use this for tomatoes, cucumbers, and melons.
- 🌶️ Chilli Focus: The highest Potassium in the range at 3.1%, plus elevated Calcium at 1.3%. Built specifically for chillies and capsicum, which are notoriously heavy feeders.
- 🥦 Vegetable Focus: Elevated Calcium at 1.1% and Magnesium at 0.7% for strong vegetative growth and cell wall development.
- 🌱 Foliage Focus: Higher Magnesium for tropical and leafy indoor plants that are running photosynthesis at a higher rate than most.
- 🌵 Succulent Focus: Elevated Calcium at 1.6% and Phosphorus at 0.7% for dense, firm growth in succulents and cacti.
- 🇦🇺 Native Focus: Formulated for Australian native plants, which have a low Phosphorus tolerance that most general nutrients ignore entirely.
- 🌸 Orchid Focus Bloom: 100% nitrate nitrogen, completely urea-free. Orchids are sensitive to urea and this formula is built around that.
All sizes are available in 250ml from $10, 1L at $18, or 5L at $55 for regular growers. View the full Growth Technology Focus range at Growers Depot.
🌿 What Is a 3-Part Base Nutrient?
A 3-part system splits your base nutrition across three separate bottles. Each bottle handles a different role, and you adjust the ratios depending on what stage of growth your plant is in.
This gives you a level of precision that a single-part formula simply cannot match. You can push more Nitrogen during vegetative growth, then shift the balance toward Phosphorus and Potassium as your plant moves into flower.
You are essentially building a custom feed for each week of the grow.
The Green Planet GP3 system is the 3-part range we stock. It is made up of three components that work together:
- 🌱 GP3 Grow: Nitrogen-rich formula for the vegetative stage. Builds root systems and drives leaf and stem development. Available from $25 for 1L.
- ⚗️ GP3 Micro: The micronutrient backbone of the system. This one runs throughout the entire grow from seedling to flush. Available from $30 for 1L.
- 🌸 GP3 Bloom: High Phosphorus and Potassium for the flowering stage, with three chelated iron sources for strong finish. Available from $25 for 1L.
The GP3 system is designed for hydroponic setups where you are dialling in EC and pH every feed. It pairs well with the full Green Planet additive lineup if you are running boosters on top of your base, which we covered in detail in our Base Nutrients vs Boosters guide.
⚖️ Single-Part vs 3-Part: The Honest Comparison
Neither system is better in absolute terms. They are built for different growers with different goals.
| Factor | Growth Technology Focus (Single-Part) | Green Planet GP3 (3-Part) |
|---|---|---|
| Ease of use | One bottle, measure and feed | Three bottles, adjust ratios per stage |
| Plant specificity | Tuned per plant type | Tuned per growth stage |
| Control | Fixed formula | Fully adjustable NPK ratios |
| Best for | Beginners, mixed gardens, specific crops | Experienced growers, dedicated hydro setups |
| Entry price | From $10 (250ml) | From $25 (1L) |
| Urea-free | Yes | Yes |
| pH buffered | Yes | Test and adjust manually |
🌱 When to Choose the Growth Technology Focus Range
If you are growing one specific crop type and you want a clean, simple feeding routine, the Focus range is the right call. You get a formula that is already optimised for your plant without needing to understand NPK ratios or adjust anything week to week.
It is also the better choice if you are growing in soil or coco and want a pH-buffered formula that reduces the risk of swings between feeds. For Aussie growers dealing with variable tap water quality across different states, that built-in buffering makes a real difference.
🌱 When to Choose Green Planet GP3
If you are running a dedicated hydroponic system, testing EC and pH every feed, and you want to push your plants hard through each growth stage, the GP3 system gives you that control.
You can run a higher Nitrogen ratio during veg, then shift the balance aggressively toward Phosphorus and Potassium as you move into peak flower.
It is also the better platform if you plan to stack boosters and additives on top of your base. The GP3 system is designed to work alongside the broader Green Planet range, giving you a complete feed program from seedling to harvest.
🔬 What About EC and pH? Both Systems Need Testing
Regardless of which base nutrient you choose, you need to be testing your EC and pH. This is not optional. A perfectly formulated nutrient is useless if your pH is outside the absorption range for your plant.
For hydroponics, keep pH between 5.5 and 6.5. For soil and coco, aim for 6.0 to 7.0. EC targets will vary depending on your plant type and growth stage, but as a general rule, start low and increase gradually while watching how your plants respond.
If you are not testing yet, that is the first thing to fix before worrying about which nutrient system to run.
✅ Final Thoughts: Pick the Right Base for Your Grow
Single-part base nutrients and 3-part systems are both legitimate choices. The Growth Technology Focus range wins on simplicity, plant specificity, and accessibility for growers at any level. The Green Planet GP3 wins on precision and flexibility for growers who want full control over their feed program.
Start with the system that matches where you are right now as a grower. You can always move to a more complex setup as your confidence grows. What you should not do is run a general nutrient when a plant-specific formula exists for exactly what you are growing.
Browse the full base nutrients range at Growers Depot and pick the one that fits your grow. 🌱
Questions about which nutrient suits your setup? Drop them in the comments below.